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Re: Most Efficient Hull??

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  • Leo
    I suppose that this is an excellent example of why text only messaging has so many limitations. I ass-u-me ed that my specifying a V/L of 1.0 would point
    Message 1 of 30 , Jan 16, 2005
    • 0 Attachment
      I suppose that this is an excellent example of why text only messaging
      has so many limitations.

      I ass-u-me'ed that my specifying a V/L of 1.0 would point everyone to
      a displacement hull. But that was obviously incorrect.

      We have folks replying with dinghy's and planning boats as examples.
      While I can't deny that these boats can be or are very efficient, I
      was actually thinking of power displacement hulls in the 25' to
      40-ish' range.

      Generally speaking - while realizing that exceptions do exist - I
      believe that a long narrow displacement hull form will be able to
      carry a larger load - read cruising supplies - longer distances with
      more comfort using less fuel than other types of boats.

      So now that I've explained my thought process a bit, I again ask -
      with some added verbage - which power displacement hull design on the
      atkin web site do you believe would be most efficient?

      Thanks - and with apologies for the earlier confusion.

      Leo


      --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
      >
      >
      > Which hull shape at http://www.atkinboatplans.com/ do you believe to
      > be most efficient?
    • John B. Trussell
      The folks who really work at efficiency are those wishing to obtain maximum speed with very limited power--competitive rowers and paddlers. These folks have
      Message 2 of 30 , Jan 17, 2005
      • 0 Attachment
        The folks who really work at efficiency are those wishing to obtain maximum speed with very limited power--competitive rowers and paddlers. These folks have determined that long, narrow hulls with semi-circular cross sections and very fine ends are the most efficient.

        Semi circular cross sections are workable if there is some mechanism to keep the boat from turning over such as the outrigger effect of oars or dynamic paddling (and it helps to part your hair in the middle). Power boats don't have such mechanisms, so a true round bottom isn't an option. Moreover, the sort of 6 or 7 to 1 beam length ratio found on canoes makes for a very cramped 40 foot power boat.

        A review of the plans catalogue is a little frustrating because some of the writeups do not include the beam. It could be argued that the most efficient hull is "Slipby" which is supposed to make over 11 mph on 5 1/2 hp. However, "Slipby" is a lot smaller than you are considering. Perhaps "Jabborwock" is the mst efficient in the type you're considering.

        This discussion reminds me of the time I had to break up a fist fight between 2 nine year olds who were arguing over whether a Ferrari was faster than a Lamborghini. Fun to wonder about but not something I'm going to have any first hand experience with.

        John T


        ----- Original Message -----
        From: Leo
        To: AtkinBoats@yahoogroups.com
        Sent: Sunday, January 16, 2005 10:22 PM
        Subject: [AtkinBoats] Re: Most Efficient Hull??



        I suppose that this is an excellent example of why text only messaging
        has so many limitations.

        I ass-u-me'ed that my specifying a V/L of 1.0 would point everyone to
        a displacement hull. But that was obviously incorrect.

        We have folks replying with dinghy's and planning boats as examples.
        While I can't deny that these boats can be or are very efficient, I
        was actually thinking of power displacement hulls in the 25' to
        40-ish' range.

        Generally speaking - while realizing that exceptions do exist - I
        believe that a long narrow displacement hull form will be able to
        carry a larger load - read cruising supplies - longer distances with
        more comfort using less fuel than other types of boats.

        So now that I've explained my thought process a bit, I again ask -
        with some added verbage - which power displacement hull design on the
        atkin web site do you believe would be most efficient?

        Thanks - and with apologies for the earlier confusion.

        Leo


        --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
        >
        >
        > Which hull shape at http://www.atkinboatplans.com/ do you believe to
        > be most efficient?





        No flaming, cursing, politics, religion or public mopery. Please be polite.

        If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

        The current Atkin boat plans catalog is online at
        <http://www.atkinboatplans.com/>





        ------------------------------------------------------------------------------
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        AtkinBoats-unsubscribe@yahoogroups.com

        c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



        [Non-text portions of this message have been removed]
      • Mike Dolph
        For your purposes I would recommend Rosdave, Seal, or Danceing Feather. Rosdave will move very economically at V/L=1 with just a 8HP Yanmar; how ever she will
        Message 3 of 30 , Jan 17, 2005
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          For your purposes I would recommend Rosdave, Seal, or Danceing
          Feather.

          Rosdave will move very economically at V/L=1 with just a 8HP Yanmar;
          how ever she will be challenging to plank. If you look at the
          diagonals you will see that the diagonal closest to the keel has some
          pretty extreme bends at the ends. Those are the bends you will have
          to follow with a plank; not easy. Seal and Dancing Feather have less
          problems with this. Seal and Dancing Feather demonstrate another
          problem in that with a safe and seaworthy hull form pure displacement
          hulls quickly generate more displacement than needed to carry a
          pleasure boat interior and ballast is needed to get them to their
          design waterlines. Canoes without ballast of 40 feet are not safe or
          comfortable for their inhabitants on the ocean so you won't find such
          designs. This continues until you reach ship sizes where ocean waves
          are much smaller than the hull. This explains the popularity
          of "lifting hulls". Rosdave will in fact generate a small amount of
          lift, many of the v-bottoms on the site will also generate lift and
          the designers notes are the best guide to which generate most unless
          someone has actually built them and tested. What you are looking for
          might be described as "the best solution of a motorized canoe with
          ballast". Well at least that imparts the idea I'm trying to get
          across:-)

          Mike Dolph
          --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
          >
          > I suppose that this is an excellent example of why text only
          messaging
          > has so many limitations.
          >
          > I ass-u-me'ed that my specifying a V/L of 1.0 would point everyone
          to
          > a displacement hull. But that was obviously incorrect.
          >
          > We have folks replying with dinghy's and planning boats as
          examples.
          > While I can't deny that these boats can be or are very efficient, I
          > was actually thinking of power displacement hulls in the 25' to
          > 40-ish' range.
          >
          > Generally speaking - while realizing that exceptions do exist - I
          > believe that a long narrow displacement hull form will be able to
          > carry a larger load - read cruising supplies - longer distances with
          > more comfort using less fuel than other types of boats.
          >
          > So now that I've explained my thought process a bit, I again ask -
          > with some added verbage - which power displacement hull design on
          the
          > atkin web site do you believe would be most efficient?
          >
          > Thanks - and with apologies for the earlier confusion.
          >
          > Leo
          >
          >
          > --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
          > >
          > >
          > > Which hull shape at http://www.atkinboatplans.com/ do you believe
          to
          > > be most efficient?
        • j_freach
          Leo I d have to agree with John T. that a Double ender like Jabberwock would be the most efficient also the most seaworthy. Double enders are very dry in rough
          Message 4 of 30 , Jan 17, 2005
          • 0 Attachment
            Leo

            I'd have to agree with John T. that a Double ender like Jabberwock
            would be the most efficient also the most seaworthy. Double enders are
            very dry in rough weather. I gave serious thought to getting plans for
            Jabberwock but ended up buying plans for Marth Green instead because
            in has full standing head room and is a boat with the Atkins used
            often and liked very much.

            Jim F


            --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
            >
            >
            > Which hull shape at http://www.atkinboatplans.com/ do you believe to
            > be most efficient?
            >
            > Let's define efficient as requiring the least horsepower to move the
            > boat through the water at at the hull speed of V/L = 1 - in other
            > words, the square root of the water line length.
            >
            > An additional way to look at "most efficient" would be to choose the
            > hull that would take the least fuel to go the farthest - at V/L = 1.
            >
            > Maybe they're the same thing?
            >
            > Anyway, which hull(s) of Atkin's fits this criteria?
            >
            > Thanks for your thoughts.
            >
            > Best,
            >
            > Leo
          • liokai2002
            Describing River Belle the 35 3 Tunnel-Stern River Cruiser William Atkin writes : The hull is easily propelled and for equal displacement and power is
            Message 5 of 30 , Jan 17, 2005
            • 0 Attachment
              Describing "River Belle" the 35'3" Tunnel-Stern River Cruiser William
              Atkin writes : " The hull is easily propelled and for equal
              displacement and power is faster by several miles than the usual
              underwater form. And these boats ... handle perfectly,ahead,astern
              in rough water or smooth ." The first boat of this model was designed
              already in 1922 !!!
              At this time most of the boats had semicircular displacement hulls
              with l/b ratios up to 1/7 ( and more ) and were difficult to build
              with big and heavy motors throwing big bow waves and rolling heavily
              in a seaway. Later on hulls of Cats and Tris were constructed in a
              similiar way with semicircular bottoms and with hardly any
              hydrodynamic lift when moving.
              From this point of view William Atkin was a Genius and a
              Visionär ( german Language ) as he knew a lot more of the water
              around his boats as others up to our days.
              From my personal experience watching University tank tests I think
              that the "Sand Piper" design also is very effective. And this is the
              same for the Higgins Landing Boats which helped to end the Nazi
              Terror.
              I think that these hulls deserve to undergo intensive tank testing
              to understand fully the Atkin designs and to minimize the vortices
              (whorls ?), waves and eddies caused by the hull moving through the
              water.In my opinion these hulls have a great potential of
              hydrodynamic efficiency. Regards, Manfred
            • Ronald Fossum
              Manfred: I have read your postings here (and, I think, in other boat design forums). As you seem to have access to tank testing facilities, I wonder if it
              Message 6 of 30 , Jan 17, 2005
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                Manfred:

                I have read your postings here (and, I think, in other boat design forums). As you seem to have access to tank testing facilities, I wonder if it would not be a worthwhile project to take the Sea Bright tunnel stern hulls - which Atkin designed in many lengths - and model them for tank testing (for the modern builder, probably the designs which could be built of plywood would have the most interest). There is a desire to have stable, shallow draft pleasure boats that will cruise comfortably in the 15 - 18 mph range (ask any family which has a 30+ mph plastic boat and you'll find - after they've owned it a year or so - that comfortable, non-pounding would be welcomed, even if at a decreased speed). I believe that the tests would show remarkable efficiency, seakindliness and seaworthiness.

                I would think that there would be a large base for these designs in Europe with it's many river, lakes, and canals - and with fuel costs much higher there, an efficient hull using less power would seem a potential "best seller". The Atkin tunnel stern Sea Brights are not well known even in the USA, so probably not at all in Europe.

                Sometime this year I expect to start work on an adaptation of Rescue Minor, but mine will be powered by a reasonably compact steam plant with normal crusing at 1000 rpm (although 2000 rpm will be possible). The shallow draft and "beachability" as well as ease in trailering and modest weight are just what I want for cruising on lakes, rivers, and the occasional trailer from Portland, OR to Puget Sound. I've lived on and around the water most of my 65 years and spent the last 3+ years searching for the "right" design for my needs and desires. I believe the Rescue Minor is it (Thanks, John, for setting up the AtkinBoatPlans website - I probably couldn't have done it without you!).

                Ron Fossum
                ----- Original Message -----
                From: liokai2002
                To: AtkinBoats@yahoogroups.com
                Sent: Monday, January 17, 2005 11:29 AM
                Subject: [AtkinBoats] Re: Most Efficient Hull??



                Describing "River Belle" the 35'3" Tunnel-Stern River Cruiser William
                Atkin writes : " The hull is easily propelled and for equal
                displacement and power is faster by several miles than the usual
                underwater form. And these boats ... handle perfectly,ahead,astern
                in rough water or smooth ." The first boat of this model was designed
                already in 1922 !!!
                At this time most of the boats had semicircular displacement hulls
                with l/b ratios up to 1/7 ( and more ) and were difficult to build
                with big and heavy motors throwing big bow waves and rolling heavily
                in a seaway. Later on hulls of Cats and Tris were constructed in a
                similiar way with semicircular bottoms and with hardly any
                hydrodynamic lift when moving.
                >From this point of view William Atkin was a Genius and a
                Visionär ( german Language ) as he knew a lot more of the water
                around his boats as others up to our days.
                >From my personal experience watching University tank tests I think
                that the "Sand Piper" design also is very effective. And this is the
                same for the Higgins Landing Boats which helped to end the Nazi
                Terror.
                I think that these hulls deserve to undergo intensive tank testing
                to understand fully the Atkin designs and to minimize the vortices
                (whorls ?), waves and eddies caused by the hull moving through the
                water.In my opinion these hulls have a great potential of
                hydrodynamic efficiency. Regards, Manfred





                No flaming, cursing, politics, religion or public mopery. Please be polite.

                If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                The current Atkin boat plans catalog is online at
                <http://www.atkinboatplans.com/>





                ------------------------------------------------------------------------------
                Yahoo! Groups Links

                a.. To visit your group on the web, go to:
                http://groups.yahoo.com/group/AtkinBoats/

                b.. To unsubscribe from this group, send an email to:
                AtkinBoats-unsubscribe@yahoogroups.com

                c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



                [Non-text portions of this message have been removed]
              • Leo
                Back when internal combustion engines were first becoming available – whether gas or diesel – these engines were massive chunks of cast iron and had very
                Message 7 of 30 , Jan 17, 2005
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                  Back when internal combustion engines were first becoming available –
                  whether gas or diesel – these engines were massive chunks of cast
                  iron and had very low HP to weight ratios. Maybe on the order of 1HP
                  per 100 pounds. Today's engines might have 10-20 HP output per 100
                  pounds of weight. Refer back to the comments about Rescue Minor and
                  how the bow acts without the motor weight that Atkin specified for an
                  example.

                  So back when Atkin was designing, motors were very underpowered and
                  the hull really needed to be "slippery" to fully take advantage of
                  the low power that was available in those days from IC engines. And
                  yes, I know I'm sorta downplaying, for now, the effect that torque
                  has on turning a large propeller slowly.

                  Based on my reading, early displacement power boat hulls evolved from
                  sailboat hulls that were "sorta" efficient. Obviously the science of
                  designing efficient displacement power boat hulls progressed rapidly –
                  as NA's learned what worked best and what was less desirable.

                  It seems to me that as engines become both more powerful and the
                  power to weight ratio improved, that the hull shapes started moving
                  away from what slipped through the water easiest and began evolving
                  into the "fat-ish" hulls of trawlers and cargo boats and that
                  evolution has progressed into the modern plastic floating apartments
                  that grace (or is that disgrace?) trade magazines and marina's the
                  world over.

                  Having recently read a history of the Whitehall Rowing boat, I began
                  to wonder why this hull form, with its fine entry, generous mid-
                  section and wineglass stern wasn't expanded upon for inboard power.
                  What's the drawback from scaling this general design up to make it a
                  30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                  couldn't one incorporate the fine entry, general midships section and
                  the fine stern sections into a power boat hull? To my very untrained
                  eye, it appears that Atkin did use some of these three design
                  principles in several of his designs.

                  IIRC, from Gerr's books and others, a large diameter, aggressively
                  pitched slow turning propeller is more efficient for moving a
                  displacement hull than a smaller less pitched propeller turning at
                  higher speeds. Or is my memory getting as gray as my hair?

                  It seems to be a difficult task in today's world to find folks that
                  agree with this philosophy. Almost all modern (inboard diesel) boat
                  propulsion systems rely on high speed engines – many with
                  turbochargers – to turn a smaller wheel. Gear ratio's in the 2:1 –
                  2.5:1 are common. This translates into prop RPM's from the low range
                  of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                  to 3600 RPM.

                  Yet just a few decades ago we had engines that idled at 300-400 RPM
                  (or less) and had an operating RPM range from 700 to 1200. These
                  engines ran for literally tens of thousands of hours nearly trouble
                  free. Nowadays we often hear of inboard diesels needing replacement
                  in as little as 2000 operating hours. Throwaway power. Yuck!

                  I believe that we can generally agree that 1) how/where you want to
                  go with a boat, 2) how long you want to stay aboard and 3) how
                  much `camping' you're willing to tolerate determines what type, size
                  and amenities we'll need. And finally, 4) aesthetics. How a boat
                  looks to our eye is vital. And as each of us has different needs and
                  tastes, I believe all 4 of these considerations are classic cases
                  where Your Mileage May Vary. ;-)

                  Addressing #1. My wife is a teacher and a decade younger – I want to
                  be able to put the boat on a trailer and go for her summer vacation
                  to Alaska via the inside passage this summer, The Erie Canal next –
                  Maine and Nova Scotia another – Trent-Severn waterway another. When
                  we're both retired then on to the Bahamas for the winter and back to
                  Alaska for an extended trip. Maybe put it aboard a freighter and
                  ship it to France for a couple of years living on the European canal
                  system.

                  Addressing #2. At first we're only talking about 10-12 weeks at a
                  stretch. Later it could be full time for a few years – or at least 8-
                  9 months out of 12.

                  Addressing #3. At first – we can tolerate a bit more `roughing it'
                  for a few weeks, but some of the things that we will not do without –
                  (not an all inclusive list) 1) space to get away from each other when
                  need to. 2) a great galley with room enough to prepare a full meal
                  without contortions of the body or with the pots and pans. 3) full
                  length and width berth(s) with comfy mattresses. 4) a separate full
                  sized shower – no sopping TP! 5) an all weather pilot station –
                  either fully enclosed or enclosable with canvas.

                  Addressing #4. I just plain like boats that look like a classic
                  boat. None of this plastic fantastic modern European shapes for me.
                  Give me the lines of an Elco or a Lake Union Dream Boat or a double
                  ended Salmon Troller or the shape of a Whitehall. Give me a nice
                  sheer and a plumb bow. How about bronze ports – either oval or
                  round – and a rearward sloping windshield instead of that forward
                  sloping monstrosity, regardless of how practical it is. Bottom
                  line? Spare me the angular constructs that adorn so many marina's
                  and boat shows.

                  Finally, I think we can all agree that petroleum products – oil, gas,
                  natural gas and diesel fuel – are just going to get more and more
                  expensive. The days of a buck a gallon diesel are probably long
                  gone. So this means that to have a boat that I can afford to
                  operate, it must be very efficient. I'd consider 7-10 statute MPG
                  the minimum – this should equate to less than 1 gallon per hour of
                  running, in other words, 6-8 knots cruising speed at less than 1
                  GPH. Better than that is just that, better. I think that this is
                  achievable in a 35'-ish boat if we don't load it down with a ton of
                  canned goods. Something less than 20,000 pounds – 15,0000 better
                  yet - fully ready to cruise would be the goal. My preliminary
                  investigations and calculations indicate that given the right hull
                  design and using modern epoxy/ply building methods this appears to be
                  an achievable goal.

                  Finally, utilize a big ol' slow turning engine with either a VPP or a
                  big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                  the most efficient fuel consumption RPM for the engine – probably
                  less than 1500 RPM - and one should have a boat that one could afford
                  to build and run without breaking the 401k and would be worthy of
                  being called a Retirement Cruiser.


                  Addressing Manfred's comments about River Belle – This would be a
                  perfect boat for cruising the ICW and the various canals, waterways
                  and rivers. But would this design be suitable for an Alaska trip or
                  a trip to the Bahamas or a summer on the Great Lakes or the coast of
                  Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                  think to go to all the various places that I'd like to visit before I
                  die, I need a boat with some sort of keel and the ability to take
                  some rough weather should the unfortunate happen.

                  Any other suggestions?

                  Best,

                  Leo
                • John B. Trussell
                  Leo-- When slow turning motors were very heavy and conventionally planked (carvel or lapstrake) were developed to float them, boats were kept in the water, and
                  Message 8 of 30 , Jan 17, 2005
                  • 0 Attachment
                    Leo--

                    When slow turning motors were very heavy and conventionally planked (carvel or lapstrake) were developed to float them, boats were kept in the water, and trailering was not a consideration.

                    If you want a boat that can live on a trailer, the first consideration is the type of tow vehicle you are willing to support. The big trucks and truck based sport utes can tow a pretty big boat; most cars can only tow around 1000 to 1500 and at the upper ends of this limit, gas consumption will decline significantly.

                    Then you need to consider how well a given type of construction will hold up to being dry sailed and bounced around on a trailer. Carvel won't take it. Boats which rely on lots of mechanical fastenings tend to get real loose after a couple of hundred miles on rough roads. Probably plywood or fiberglass over strip planking are your best bets.

                    I have looked for "big ol slow turning engines", and I haven't found any yet--seems I'm about 10 to 15 years too late. The closest thing I've found is a variety of kits for steam engines. They look like a lot of fun, but I don't have the skills or tools to build one, nor the committment to run one.

                    As far as getting all the amenities you are looking for in an easy to trailer boat, I just don't think it is possible. If you figure it out, let me know!

                    John T
                    ----- Original Message -----
                    From: Leo
                    To: AtkinBoats@yahoogroups.com
                    Sent: Monday, January 17, 2005 3:35 PM
                    Subject: [AtkinBoats] Easily driven boats



                    Back when internal combustion engines were first becoming available -
                    whether gas or diesel - these engines were massive chunks of cast
                    iron and had very low HP to weight ratios. Maybe on the order of 1HP
                    per 100 pounds. Today's engines might have 10-20 HP output per 100
                    pounds of weight. Refer back to the comments about Rescue Minor and
                    how the bow acts without the motor weight that Atkin specified for an
                    example.

                    So back when Atkin was designing, motors were very underpowered and
                    the hull really needed to be "slippery" to fully take advantage of
                    the low power that was available in those days from IC engines. And
                    yes, I know I'm sorta downplaying, for now, the effect that torque
                    has on turning a large propeller slowly.

                    Based on my reading, early displacement power boat hulls evolved from
                    sailboat hulls that were "sorta" efficient. Obviously the science of
                    designing efficient displacement power boat hulls progressed rapidly -
                    as NA's learned what worked best and what was less desirable.

                    It seems to me that as engines become both more powerful and the
                    power to weight ratio improved, that the hull shapes started moving
                    away from what slipped through the water easiest and began evolving
                    into the "fat-ish" hulls of trawlers and cargo boats and that
                    evolution has progressed into the modern plastic floating apartments
                    that grace (or is that disgrace?) trade magazines and marina's the
                    world over.

                    Having recently read a history of the Whitehall Rowing boat, I began
                    to wonder why this hull form, with its fine entry, generous mid-
                    section and wineglass stern wasn't expanded upon for inboard power.
                    What's the drawback from scaling this general design up to make it a
                    30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                    couldn't one incorporate the fine entry, general midships section and
                    the fine stern sections into a power boat hull? To my very untrained
                    eye, it appears that Atkin did use some of these three design
                    principles in several of his designs.

                    IIRC, from Gerr's books and others, a large diameter, aggressively
                    pitched slow turning propeller is more efficient for moving a
                    displacement hull than a smaller less pitched propeller turning at
                    higher speeds. Or is my memory getting as gray as my hair?

                    It seems to be a difficult task in today's world to find folks that
                    agree with this philosophy. Almost all modern (inboard diesel) boat
                    propulsion systems rely on high speed engines - many with
                    turbochargers - to turn a smaller wheel. Gear ratio's in the 2:1 -
                    2.5:1 are common. This translates into prop RPM's from the low range
                    of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                    to 3600 RPM.

                    Yet just a few decades ago we had engines that idled at 300-400 RPM
                    (or less) and had an operating RPM range from 700 to 1200. These
                    engines ran for literally tens of thousands of hours nearly trouble
                    free. Nowadays we often hear of inboard diesels needing replacement
                    in as little as 2000 operating hours. Throwaway power. Yuck!

                    I believe that we can generally agree that 1) how/where you want to
                    go with a boat, 2) how long you want to stay aboard and 3) how
                    much `camping' you're willing to tolerate determines what type, size
                    and amenities we'll need. And finally, 4) aesthetics. How a boat
                    looks to our eye is vital. And as each of us has different needs and
                    tastes, I believe all 4 of these considerations are classic cases
                    where Your Mileage May Vary. ;-)

                    Addressing #1. My wife is a teacher and a decade younger - I want to
                    be able to put the boat on a trailer and go for her summer vacation
                    to Alaska via the inside passage this summer, The Erie Canal next -
                    Maine and Nova Scotia another - Trent-Severn waterway another. When
                    we're both retired then on to the Bahamas for the winter and back to
                    Alaska for an extended trip. Maybe put it aboard a freighter and
                    ship it to France for a couple of years living on the European canal
                    system.

                    Addressing #2. At first we're only talking about 10-12 weeks at a
                    stretch. Later it could be full time for a few years - or at least 8-
                    9 months out of 12.

                    Addressing #3. At first - we can tolerate a bit more `roughing it'
                    for a few weeks, but some of the things that we will not do without -
                    (not an all inclusive list) 1) space to get away from each other when
                    need to. 2) a great galley with room enough to prepare a full meal
                    without contortions of the body or with the pots and pans. 3) full
                    length and width berth(s) with comfy mattresses. 4) a separate full
                    sized shower - no sopping TP! 5) an all weather pilot station -
                    either fully enclosed or enclosable with canvas.

                    Addressing #4. I just plain like boats that look like a classic
                    boat. None of this plastic fantastic modern European shapes for me.
                    Give me the lines of an Elco or a Lake Union Dream Boat or a double
                    ended Salmon Troller or the shape of a Whitehall. Give me a nice
                    sheer and a plumb bow. How about bronze ports - either oval or
                    round - and a rearward sloping windshield instead of that forward
                    sloping monstrosity, regardless of how practical it is. Bottom
                    line? Spare me the angular constructs that adorn so many marina's
                    and boat shows.

                    Finally, I think we can all agree that petroleum products - oil, gas,
                    natural gas and diesel fuel - are just going to get more and more
                    expensive. The days of a buck a gallon diesel are probably long
                    gone. So this means that to have a boat that I can afford to
                    operate, it must be very efficient. I'd consider 7-10 statute MPG
                    the minimum - this should equate to less than 1 gallon per hour of
                    running, in other words, 6-8 knots cruising speed at less than 1
                    GPH. Better than that is just that, better. I think that this is
                    achievable in a 35'-ish boat if we don't load it down with a ton of
                    canned goods. Something less than 20,000 pounds - 15,0000 better
                    yet - fully ready to cruise would be the goal. My preliminary
                    investigations and calculations indicate that given the right hull
                    design and using modern epoxy/ply building methods this appears to be
                    an achievable goal.

                    Finally, utilize a big ol' slow turning engine with either a VPP or a
                    big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                    the most efficient fuel consumption RPM for the engine - probably
                    less than 1500 RPM - and one should have a boat that one could afford
                    to build and run without breaking the 401k and would be worthy of
                    being called a Retirement Cruiser.


                    Addressing Manfred's comments about River Belle - This would be a
                    perfect boat for cruising the ICW and the various canals, waterways
                    and rivers. But would this design be suitable for an Alaska trip or
                    a trip to the Bahamas or a summer on the Great Lakes or the coast of
                    Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                    think to go to all the various places that I'd like to visit before I
                    die, I need a boat with some sort of keel and the ability to take
                    some rough weather should the unfortunate happen.

                    Any other suggestions?

                    Best,

                    Leo






                    No flaming, cursing, politics, religion or public mopery. Please be polite.

                    If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                    The current Atkin boat plans catalog is online at
                    <http://www.atkinboatplans.com/>





                    ------------------------------------------------------------------------------
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                    [Non-text portions of this message have been removed]
                  • Ronald Fossum
                    Engines: check out SABB (not Saab) diesels. These are a Norwegian (Norske is always better than Swede anyway) made engines of relatively low rpms with a
                    Message 9 of 30 , Jan 17, 2005
                    • 0 Attachment
                      Engines: check out SABB (not Saab) diesels. These are a Norwegian (Norske is always better than Swede anyway) made engines of relatively low rpms with a variable pitch propeller. The vibration is minimal and, if you have to, they can be crank started. The 10 HP (real 10 HP) is a vibration dampened engine and burns 4.5 PINTS of fuel per hour at 10 HP output. I've ridden in 2 boats that had this engine installed and it was a very pleasureable ride. The larger 18 - 30 HP is two cylinder with the same quiet, lack of vibration, and fuel economy. Use the Google search engine and enter Sabb engine (ignore Google's prompt "did you mean saab engine") and you'll find a plethora of websites!

                      For a hull design I would look at a modification (sorry John, forget there was no "swearing" allowed) of "Ghost". If the engine were moved forward, the after open cockpit could be enclosed giving the additional interior space you desire. I think a competent naval architect could make the modifications (it would be worth the money as this will be a long term possession). She would not be a "true" Atkin design but certainly could be called "inspired by a design of William Atkin".

                      Ron Fossum

                      ----- Original Message -----
                      From: Leo
                      To: AtkinBoats@yahoogroups.com
                      Sent: Monday, January 17, 2005 12:35 PM
                      Subject: [AtkinBoats] Easily driven boats



                      Back when internal combustion engines were first becoming available -
                      whether gas or diesel - these engines were massive chunks of cast
                      iron and had very low HP to weight ratios. Maybe on the order of 1HP
                      per 100 pounds. Today's engines might have 10-20 HP output per 100
                      pounds of weight. Refer back to the comments about Rescue Minor and
                      how the bow acts without the motor weight that Atkin specified for an
                      example.

                      So back when Atkin was designing, motors were very underpowered and
                      the hull really needed to be "slippery" to fully take advantage of
                      the low power that was available in those days from IC engines. And
                      yes, I know I'm sorta downplaying, for now, the effect that torque
                      has on turning a large propeller slowly.

                      Based on my reading, early displacement power boat hulls evolved from
                      sailboat hulls that were "sorta" efficient. Obviously the science of
                      designing efficient displacement power boat hulls progressed rapidly -
                      as NA's learned what worked best and what was less desirable.

                      It seems to me that as engines become both more powerful and the
                      power to weight ratio improved, that the hull shapes started moving
                      away from what slipped through the water easiest and began evolving
                      into the "fat-ish" hulls of trawlers and cargo boats and that
                      evolution has progressed into the modern plastic floating apartments
                      that grace (or is that disgrace?) trade magazines and marina's the
                      world over.

                      Having recently read a history of the Whitehall Rowing boat, I began
                      to wonder why this hull form, with its fine entry, generous mid-
                      section and wineglass stern wasn't expanded upon for inboard power.
                      What's the drawback from scaling this general design up to make it a
                      30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                      couldn't one incorporate the fine entry, general midships section and
                      the fine stern sections into a power boat hull? To my very untrained
                      eye, it appears that Atkin did use some of these three design
                      principles in several of his designs.

                      IIRC, from Gerr's books and others, a large diameter, aggressively
                      pitched slow turning propeller is more efficient for moving a
                      displacement hull than a smaller less pitched propeller turning at
                      higher speeds. Or is my memory getting as gray as my hair?

                      It seems to be a difficult task in today's world to find folks that
                      agree with this philosophy. Almost all modern (inboard diesel) boat
                      propulsion systems rely on high speed engines - many with
                      turbochargers - to turn a smaller wheel. Gear ratio's in the 2:1 -
                      2.5:1 are common. This translates into prop RPM's from the low range
                      of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                      to 3600 RPM.

                      Yet just a few decades ago we had engines that idled at 300-400 RPM
                      (or less) and had an operating RPM range from 700 to 1200. These
                      engines ran for literally tens of thousands of hours nearly trouble
                      free. Nowadays we often hear of inboard diesels needing replacement
                      in as little as 2000 operating hours. Throwaway power. Yuck!

                      I believe that we can generally agree that 1) how/where you want to
                      go with a boat, 2) how long you want to stay aboard and 3) how
                      much `camping' you're willing to tolerate determines what type, size
                      and amenities we'll need. And finally, 4) aesthetics. How a boat
                      looks to our eye is vital. And as each of us has different needs and
                      tastes, I believe all 4 of these considerations are classic cases
                      where Your Mileage May Vary. ;-)

                      Addressing #1. My wife is a teacher and a decade younger - I want to
                      be able to put the boat on a trailer and go for her summer vacation
                      to Alaska via the inside passage this summer, The Erie Canal next -
                      Maine and Nova Scotia another - Trent-Severn waterway another. When
                      we're both retired then on to the Bahamas for the winter and back to
                      Alaska for an extended trip. Maybe put it aboard a freighter and
                      ship it to France for a couple of years living on the European canal
                      system.

                      Addressing #2. At first we're only talking about 10-12 weeks at a
                      stretch. Later it could be full time for a few years - or at least 8-
                      9 months out of 12.

                      Addressing #3. At first - we can tolerate a bit more `roughing it'
                      for a few weeks, but some of the things that we will not do without -
                      (not an all inclusive list) 1) space to get away from each other when
                      need to. 2) a great galley with room enough to prepare a full meal
                      without contortions of the body or with the pots and pans. 3) full
                      length and width berth(s) with comfy mattresses. 4) a separate full
                      sized shower - no sopping TP! 5) an all weather pilot station -
                      either fully enclosed or enclosable with canvas.

                      Addressing #4. I just plain like boats that look like a classic
                      boat. None of this plastic fantastic modern European shapes for me.
                      Give me the lines of an Elco or a Lake Union Dream Boat or a double
                      ended Salmon Troller or the shape of a Whitehall. Give me a nice
                      sheer and a plumb bow. How about bronze ports - either oval or
                      round - and a rearward sloping windshield instead of that forward
                      sloping monstrosity, regardless of how practical it is. Bottom
                      line? Spare me the angular constructs that adorn so many marina's
                      and boat shows.

                      Finally, I think we can all agree that petroleum products - oil, gas,
                      natural gas and diesel fuel - are just going to get more and more
                      expensive. The days of a buck a gallon diesel are probably long
                      gone. So this means that to have a boat that I can afford to
                      operate, it must be very efficient. I'd consider 7-10 statute MPG
                      the minimum - this should equate to less than 1 gallon per hour of
                      running, in other words, 6-8 knots cruising speed at less than 1
                      GPH. Better than that is just that, better. I think that this is
                      achievable in a 35'-ish boat if we don't load it down with a ton of
                      canned goods. Something less than 20,000 pounds - 15,0000 better
                      yet - fully ready to cruise would be the goal. My preliminary
                      investigations and calculations indicate that given the right hull
                      design and using modern epoxy/ply building methods this appears to be
                      an achievable goal.

                      Finally, utilize a big ol' slow turning engine with either a VPP or a
                      big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                      the most efficient fuel consumption RPM for the engine - probably
                      less than 1500 RPM - and one should have a boat that one could afford
                      to build and run without breaking the 401k and would be worthy of
                      being called a Retirement Cruiser.


                      Addressing Manfred's comments about River Belle - This would be a
                      perfect boat for cruising the ICW and the various canals, waterways
                      and rivers. But would this design be suitable for an Alaska trip or
                      a trip to the Bahamas or a summer on the Great Lakes or the coast of
                      Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                      think to go to all the various places that I'd like to visit before I
                      die, I need a boat with some sort of keel and the ability to take
                      some rough weather should the unfortunate happen.

                      Any other suggestions?

                      Best,

                      Leo






                      No flaming, cursing, politics, religion or public mopery. Please be polite.

                      If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                      The current Atkin boat plans catalog is online at
                      <http://www.atkinboatplans.com/>





                      ------------------------------------------------------------------------------
                      Yahoo! Groups Links

                      a.. To visit your group on the web, go to:
                      http://groups.yahoo.com/group/AtkinBoats/

                      b.. To unsubscribe from this group, send an email to:
                      AtkinBoats-unsubscribe@yahoogroups.com

                      c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



                      [Non-text portions of this message have been removed]
                    • Leo
                      ... wrote: [snip] ... to trailer boat, I just don t think it is possible. If you figure it out, let me know! ... John, The one word that
                      Message 10 of 30 , Jan 17, 2005
                      • 0 Attachment
                        --- In AtkinBoats@yahoogroups.com, "John B. Trussell"
                        <John.Trussell@w...> wrote:
                        [snip]
                        > As far as getting all the amenities you are looking for in an easy
                        to trailer boat, I just don't think it is possible. If you figure it
                        out, let me know!
                        >
                        > John T

                        John,

                        The one word that I did not use was easy. It is possible, but it
                        isn't something that you're going to move on and off a trailer just
                        for a weekend.

                        Next time you're out on the road take a look at a semi tractor-trailer
                        combination. Particularly with a 53' trailer and a cab over tractor.

                        Envision if you will the cubic area that the trailer - and its 24"
                        tires encompass. That's 53' long by 102" wide by 13'6" tall - that's
                        ~6081 cubic feet that you have to put a boat in. What that really
                        means is that in order for someone to legally haul any load over the
                        interstate highway system it has to be within those dimensions.

                        The various states can and do regulate trailer width and overall
                        length on their state highways. Mostly they allow this federal size
                        without hassle - some states require a permit for certain areas.

                        Regardless, all my research suggests that one can haul a boat from A
                        to B without any trouble if it's within these dimensions.

                        But I've also found that an 8' 6" wide boat just isn't very easy to
                        design an interior for. In order to get the amenities in that I
                        listed it's starting to stretch out to 42-43 feet long. Too long IMO.

                        But when one increases the beam of the boat to 10' 6" the overall
                        length can come back to the 36'-38' range and still get in the
                        amenities I mentioned.

                        What's that do for trailering? Well, you'll have to have an
                        over-width permit for every state you go through. But I have not yet
                        found a state I'd travel through that requires a pilot car for a 10'6"
                        load - just a sign saying overwidth and some special lights and travel
                        during the day and stay out of some cities. But all in all still doable.

                        Since moving to Texas I have come to despise the hot and humid
                        summers. But I adore the mild winters. When it's blowing and snowing
                        where I used to live in Washington, I had the office window and the
                        back door open all day for 4 days around New Years. Mid 60's a night
                        and high 70's in the day time. Plus we're getting about 1 hour and 45
                        minutes more daylight here than we were in Washington.

                        So let's suppose that after I retire and the wife is still teaching
                        that we have our winter home here in Texas and we travel north from
                        May until September. We miss 80% of the hot weather and 90% of the
                        nasty humidity.

                        After the wife retires we travel from April until November. As I
                        mentioned before maybe actually winter in the Bahamas. Or on a canal
                        in France.

                        How to get the boat between Texas and the summer's cruising grounds?
                        It >>MIGHT<< make sense to convert a used lowboy trailer to haul the
                        boat. If we're using a converted lowboy trailerI don't think it makes
                        too much ecomomic sense to own a specialty tractor just for hauling
                        the boat though. My spread sheets seem to suggest that hiring a
                        licensed overwidth tractor & driver to haul the boat either once or
                        twice a year make more sense.

                        OK, a different approach. Let's say the final design comes in under
                        15,000 pounds empty sitting on a trailer. There are lots of heavy
                        duty light trucks (pickups) or medium duty commercial trucks that have
                        that sort of towing capacity. And remember that we do not need the
                        trailer tires that a semi uses - we just don't have the weight that
                        they are needed for. So 6 much smaller tires are all that's needed
                        for that weight. Current prices - about $150 each versus the several
                        hundred each for commercial tires. Plus add in a specially
                        constructed trailer (that I can weld up) and that >>MIGHT<< make
                        economic sense.

                        So trailering a <-40' x 10.5' boat is doable with some planning and
                        forethought.

                        But yes, a clinker built boat won't take the stresses. One can have a
                        boat that looks like a classic but is built using modern techniques
                        and materials and engineered to take advantage of the strength of
                        modern materials so that it will stand the rigors of trailering and
                        still be seaworthy.

                        The thing is that this just hasn't been done often. But the physical
                        aspects are not (IMO) the massive hurdles that lots of folks make them
                        out to be.

                        YMMV and all that.

                        Best,

                        Leo
                      • John B. Trussell
                        Leo--One of my fantasies is to retire and buy a 35 motorsailer (Fishers made in England). Spend the summers in New England/Nova Scotia. Head south as the
                        Message 11 of 30 , Jan 17, 2005
                        • 0 Attachment
                          Leo--One of my fantasies is to retire and buy a 35 ' motorsailer (Fishers made in England). Spend the summers in New England/Nova Scotia. Head south as the leaves turn for the Gulf or Carribean. Head north as the dogwoods bloom. It will never happen (my wife is not enthusiastic and I've too many ties to the land), but it sure is fun to think about.

                          If you are going to tow with a Peterbuilt, there are lots more options!

                          John T
                          ----- Original Message -----
                          From: Leo
                          To: AtkinBoats@yahoogroups.com
                          Sent: Monday, January 17, 2005 6:41 PM
                          Subject: [AtkinBoats] Re: Easily driven boats



                          --- In AtkinBoats@yahoogroups.com, "John B. Trussell"
                          <John.Trussell@w...> wrote:
                          [snip]
                          > As far as getting all the amenities you are looking for in an easy
                          to trailer boat, I just don't think it is possible. If you figure it
                          out, let me know!
                          >
                          > John T

                          John,

                          The one word that I did not use was easy. It is possible, but it
                          isn't something that you're going to move on and off a trailer just
                          for a weekend.

                          Next time you're out on the road take a look at a semi tractor-trailer
                          combination. Particularly with a 53' trailer and a cab over tractor.

                          Envision if you will the cubic area that the trailer - and its 24"
                          tires encompass. That's 53' long by 102" wide by 13'6" tall - that's
                          ~6081 cubic feet that you have to put a boat in. What that really
                          means is that in order for someone to legally haul any load over the
                          interstate highway system it has to be within those dimensions.

                          The various states can and do regulate trailer width and overall
                          length on their state highways. Mostly they allow this federal size
                          without hassle - some states require a permit for certain areas.

                          Regardless, all my research suggests that one can haul a boat from A
                          to B without any trouble if it's within these dimensions.

                          But I've also found that an 8' 6" wide boat just isn't very easy to
                          design an interior for. In order to get the amenities in that I
                          listed it's starting to stretch out to 42-43 feet long. Too long IMO.

                          But when one increases the beam of the boat to 10' 6" the overall
                          length can come back to the 36'-38' range and still get in the
                          amenities I mentioned.

                          What's that do for trailering? Well, you'll have to have an
                          over-width permit for every state you go through. But I have not yet
                          found a state I'd travel through that requires a pilot car for a 10'6"
                          load - just a sign saying overwidth and some special lights and travel
                          during the day and stay out of some cities. But all in all still doable.

                          Since moving to Texas I have come to despise the hot and humid
                          summers. But I adore the mild winters. When it's blowing and snowing
                          where I used to live in Washington, I had the office window and the
                          back door open all day for 4 days around New Years. Mid 60's a night
                          and high 70's in the day time. Plus we're getting about 1 hour and 45
                          minutes more daylight here than we were in Washington.

                          So let's suppose that after I retire and the wife is still teaching
                          that we have our winter home here in Texas and we travel north from
                          May until September. We miss 80% of the hot weather and 90% of the
                          nasty humidity.

                          After the wife retires we travel from April until November. As I
                          mentioned before maybe actually winter in the Bahamas. Or on a canal
                          in France.

                          How to get the boat between Texas and the summer's cruising grounds?
                          It >>MIGHT<< make sense to convert a used lowboy trailer to haul the
                          boat. If we're using a converted lowboy trailerI don't think it makes
                          too much ecomomic sense to own a specialty tractor just for hauling
                          the boat though. My spread sheets seem to suggest that hiring a
                          licensed overwidth tractor & driver to haul the boat either once or
                          twice a year make more sense.

                          OK, a different approach. Let's say the final design comes in under
                          15,000 pounds empty sitting on a trailer. There are lots of heavy
                          duty light trucks (pickups) or medium duty commercial trucks that have
                          that sort of towing capacity. And remember that we do not need the
                          trailer tires that a semi uses - we just don't have the weight that
                          they are needed for. So 6 much smaller tires are all that's needed
                          for that weight. Current prices - about $150 each versus the several
                          hundred each for commercial tires. Plus add in a specially
                          constructed trailer (that I can weld up) and that >>MIGHT<< make
                          economic sense.

                          So trailering a <-40' x 10.5' boat is doable with some planning and
                          forethought.

                          But yes, a clinker built boat won't take the stresses. One can have a
                          boat that looks like a classic but is built using modern techniques
                          and materials and engineered to take advantage of the strength of
                          modern materials so that it will stand the rigors of trailering and
                          still be seaworthy.

                          The thing is that this just hasn't been done often. But the physical
                          aspects are not (IMO) the massive hurdles that lots of folks make them
                          out to be.

                          YMMV and all that.

                          Best,

                          Leo





                          No flaming, cursing, politics, religion or public mopery. Please be polite.

                          If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                          The current Atkin boat plans catalog is online at
                          <http://www.atkinboatplans.com/>





                          ------------------------------------------------------------------------------
                          Yahoo! Groups Links

                          a.. To visit your group on the web, go to:
                          http://groups.yahoo.com/group/AtkinBoats/

                          b.. To unsubscribe from this group, send an email to:
                          AtkinBoats-unsubscribe@yahoogroups.com

                          c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



                          [Non-text portions of this message have been removed]
                        • Lewis E. Gordon
                          Leo, Wow, you certainly have stirred up some good responses on this thread and the previous! I too am looking for a cruising boat to build; but my cruising
                          Message 12 of 30 , Jan 17, 2005
                          • 0 Attachment
                            Leo,

                            Wow, you certainly have stirred up some good responses on this thread
                            and the previous! I too am looking for a cruising boat to build; but
                            my cruising would be on a lake about 100 miles long by 40 miles wide
                            so the size requirements are different. However, the cost of diesel
                            fuel here in Nicaragua is high (not as high as Europe) and I am
                            looking for a very efficient hull in the 23-26 foot range. I would
                            like to use an agriculture air-cooled engine in the 6.6 to 13 HP range
                            with belt drive. I can buy a 6.6 for $639 and an 11 HP was quoted at
                            about $1,300.

                            I really like the idea of a motorsailer for the assist it can give as
                            well as dampening the motion in these sometimes (well lots of the
                            time) rough waters. Some of the local transportation pangas use a 9.9
                            to 15 HP outboard and a sail. So, today the check was put in the mail
                            for study plans of "Little Water", "Little Silver" and "Lady of the
                            Lake". Okay, I know a stern-wheeler is not efficient, but "Lady of the
                            Lake" is for another project!

                            Mr. Robb White suggested "Little Water" but it is a fishing boat and
                            the cabin is minimal. Still, it looks attractive even though I don't
                            need the extreme shoal draft. (One inch draft per foot of deck length
                            would be fine.) "Little Silver" is a V-bottom motor-sailor with a nice
                            cabin. I wish I could remember the design where the Atkins compared
                            the SeaBright Skiff based designs with V-bottom designs. For our lake
                            conditions, the V-bottom may be the way to go.

                            Oh, some more design considerations! Exterior plywood is almost
                            impossible to buy, and forget about marine grade! Good boatbuilding
                            woods are available but not cheap; and forget about asking for
                            quarter-sawn! There is a good wood here for steam bending (locals soak
                            it in water) but I haven't priced it yet. And I won't be building
                            alone. Our young carpenter working on things for the house is an
                            artist with wood and his rates are affordable!

                            I love this group!

                            Lewis

                            p.s. And I haven't entirely excluded Russell R. as a cheap option!


                            --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
                            >
                            > Back when internal combustion engines were first becoming available –
                            > whether gas or diesel – these engines were massive chunks of cast
                            > iron and had very low HP to weight ratios. Maybe on the order of 1HP
                            > per 100 pounds. Today's engines might have 10-20 HP output per 100
                            > pounds of weight. Refer back to the comments about Rescue Minor and
                            > how the bow acts without the motor weight that Atkin specified for an
                            > example.
                            >
                            > So back when Atkin was designing, motors were very underpowered and
                            > the hull really needed to be "slippery" to fully take advantage of
                            > the low power that was available in those days from IC engines. And
                            > yes, I know I'm sorta downplaying, for now, the effect that torque
                            > has on turning a large propeller slowly.
                            >
                            > Based on my reading, early displacement power boat hulls evolved from
                            > sailboat hulls that were "sorta" efficient. Obviously the science of
                            > designing efficient displacement power boat hulls progressed rapidly –
                            > as NA's learned what worked best and what was less desirable.
                            >
                            > It seems to me that as engines become both more powerful and the
                            > power to weight ratio improved, that the hull shapes started moving
                            > away from what slipped through the water easiest and began evolving
                            > into the "fat-ish" hulls of trawlers and cargo boats and that
                            > evolution has progressed into the modern plastic floating apartments
                            > that grace (or is that disgrace?) trade magazines and marina's the
                            > world over.
                            >
                            > Having recently read a history of the Whitehall Rowing boat, I began
                            > to wonder why this hull form, with its fine entry, generous mid-
                            > section and wineglass stern wasn't expanded upon for inboard power.
                            > What's the drawback from scaling this general design up to make it a
                            > 30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                            > couldn't one incorporate the fine entry, general midships section and
                            > the fine stern sections into a power boat hull? To my very untrained
                            > eye, it appears that Atkin did use some of these three design
                            > principles in several of his designs.
                            >
                            > IIRC, from Gerr's books and others, a large diameter, aggressively
                            > pitched slow turning propeller is more efficient for moving a
                            > displacement hull than a smaller less pitched propeller turning at
                            > higher speeds. Or is my memory getting as gray as my hair?
                            >
                            > It seems to be a difficult task in today's world to find folks that
                            > agree with this philosophy. Almost all modern (inboard diesel) boat
                            > propulsion systems rely on high speed engines – many with
                            > turbochargers – to turn a smaller wheel. Gear ratio's in the 2:1 –
                            > 2.5:1 are common. This translates into prop RPM's from the low range
                            > of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                            > to 3600 RPM.
                            >
                            > Yet just a few decades ago we had engines that idled at 300-400 RPM
                            > (or less) and had an operating RPM range from 700 to 1200. These
                            > engines ran for literally tens of thousands of hours nearly trouble
                            > free. Nowadays we often hear of inboard diesels needing replacement
                            > in as little as 2000 operating hours. Throwaway power. Yuck!
                            >
                            > I believe that we can generally agree that 1) how/where you want to
                            > go with a boat, 2) how long you want to stay aboard and 3) how
                            > much `camping' you're willing to tolerate determines what type, size
                            > and amenities we'll need. And finally, 4) aesthetics. How a boat
                            > looks to our eye is vital. And as each of us has different needs and
                            > tastes, I believe all 4 of these considerations are classic cases
                            > where Your Mileage May Vary. ;-)
                            >
                            > Addressing #1. My wife is a teacher and a decade younger – I want to
                            > be able to put the boat on a trailer and go for her summer vacation
                            > to Alaska via the inside passage this summer, The Erie Canal next –
                            > Maine and Nova Scotia another – Trent-Severn waterway another. When
                            > we're both retired then on to the Bahamas for the winter and back to
                            > Alaska for an extended trip. Maybe put it aboard a freighter and
                            > ship it to France for a couple of years living on the European canal
                            > system.
                            >
                            > Addressing #2. At first we're only talking about 10-12 weeks at a
                            > stretch. Later it could be full time for a few years – or at least 8-
                            > 9 months out of 12.
                            >
                            > Addressing #3. At first – we can tolerate a bit more `roughing it'
                            > for a few weeks, but some of the things that we will not do without –
                            > (not an all inclusive list) 1) space to get away from each other when
                            > need to. 2) a great galley with room enough to prepare a full meal
                            > without contortions of the body or with the pots and pans. 3) full
                            > length and width berth(s) with comfy mattresses. 4) a separate full
                            > sized shower – no sopping TP! 5) an all weather pilot station –
                            > either fully enclosed or enclosable with canvas.
                            >
                            > Addressing #4. I just plain like boats that look like a classic
                            > boat. None of this plastic fantastic modern European shapes for me.
                            > Give me the lines of an Elco or a Lake Union Dream Boat or a double
                            > ended Salmon Troller or the shape of a Whitehall. Give me a nice
                            > sheer and a plumb bow. How about bronze ports – either oval or
                            > round – and a rearward sloping windshield instead of that forward
                            > sloping monstrosity, regardless of how practical it is. Bottom
                            > line? Spare me the angular constructs that adorn so many marina's
                            > and boat shows.
                            >
                            > Finally, I think we can all agree that petroleum products – oil, gas,
                            > natural gas and diesel fuel – are just going to get more and more
                            > expensive. The days of a buck a gallon diesel are probably long
                            > gone. So this means that to have a boat that I can afford to
                            > operate, it must be very efficient. I'd consider 7-10 statute MPG
                            > the minimum – this should equate to less than 1 gallon per hour of
                            > running, in other words, 6-8 knots cruising speed at less than 1
                            > GPH. Better than that is just that, better. I think that this is
                            > achievable in a 35'-ish boat if we don't load it down with a ton of
                            > canned goods. Something less than 20,000 pounds – 15,0000 better
                            > yet - fully ready to cruise would be the goal. My preliminary
                            > investigations and calculations indicate that given the right hull
                            > design and using modern epoxy/ply building methods this appears to be
                            > an achievable goal.
                            >
                            > Finally, utilize a big ol' slow turning engine with either a VPP or a
                            > big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                            > the most efficient fuel consumption RPM for the engine – probably
                            > less than 1500 RPM - and one should have a boat that one could afford
                            > to build and run without breaking the 401k and would be worthy of
                            > being called a Retirement Cruiser.
                            >
                            >
                            > Addressing Manfred's comments about River Belle – This would be a
                            > perfect boat for cruising the ICW and the various canals, waterways
                            > and rivers. But would this design be suitable for an Alaska trip or
                            > a trip to the Bahamas or a summer on the Great Lakes or the coast of
                            > Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                            > think to go to all the various places that I'd like to visit before I
                            > die, I need a boat with some sort of keel and the ability to take
                            > some rough weather should the unfortunate happen.
                            >
                            > Any other suggestions?
                            >
                            > Best,
                            >
                            > Leo
                          • William E. Parker
                            I am learning a lot as we go through this thread, and hope to learn more. I would like to put in a good word for the scow style hull typified by Sandpiper.
                            Message 13 of 30 , Jan 18, 2005
                            • 0 Attachment
                              I am learning a lot as we go through this thread, and hope to learn more. I
                              would like to put in a good word for the scow style hull typified by
                              Sandpiper. If you think about what canal living is like, and look into what
                              those European canal boats had to do to make a living, they frequently went
                              "outside" and survived the experience. Certainly the British Thames barges
                              could stand a blow when they needed to. The other great plus is the
                              stability of a scow hull. A narrow scow hull will still have great initial
                              stability, which is very desirable in a live-aboard boat.
                              -----Original Message-----
                              From: Lewis E. Gordon [mailto:l_gordon_nica@...]
                              Sent: Monday, January 17, 2005 10:15 PM
                              To: AtkinBoats@yahoogroups.com
                              Subject: [AtkinBoats] Re: Easily driven boats (and study plans ordered)



                              Leo,

                              Wow, you certainly have stirred up some good responses on this thread
                              and the previous! I too am looking for a cruising boat to build; but
                              my cruising would be on a lake about 100 miles long by 40 miles wide
                              so the size requirements are different. However, the cost of diesel
                              fuel here in Nicaragua is high (not as high as Europe) and I am
                              looking for a very efficient hull in the 23-26 foot range. I would
                              like to use an agriculture air-cooled engine in the 6.6 to 13 HP range
                              with belt drive. I can buy a 6.6 for $639 and an 11 HP was quoted at
                              about $1,300.

                              I really like the idea of a motorsailer for the assist it can give as
                              well as dampening the motion in these sometimes (well lots of the
                              time) rough waters. Some of the local transportation pangas use a 9.9
                              to 15 HP outboard and a sail. So, today the check was put in the mail
                              for study plans of "Little Water", "Little Silver" and "Lady of the
                              Lake". Okay, I know a stern-wheeler is not efficient, but "Lady of the
                              Lake" is for another project!

                              Mr. Robb White suggested "Little Water" but it is a fishing boat and
                              the cabin is minimal. Still, it looks attractive even though I don't
                              need the extreme shoal draft. (One inch draft per foot of deck length
                              would be fine.) "Little Silver" is a V-bottom motor-sailor with a nice
                              cabin. I wish I could remember the design where the Atkins compared
                              the SeaBright Skiff based designs with V-bottom designs. For our lake
                              conditions, the V-bottom may be the way to go.

                              Oh, some more design considerations! Exterior plywood is almost
                              impossible to buy, and forget about marine grade! Good boatbuilding
                              woods are available but not cheap; and forget about asking for
                              quarter-sawn! There is a good wood here for steam bending (locals soak
                              it in water) but I haven't priced it yet. And I won't be building
                              alone. Our young carpenter working on things for the house is an
                              artist with wood and his rates are affordable!

                              I love this group!

                              Lewis

                              p.s. And I haven't entirely excluded Russell R. as a cheap option!


                              --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
                              >
                              > Back when internal combustion engines were first becoming available –
                              > whether gas or diesel – these engines were massive chunks of cast
                              > iron and had very low HP to weight ratios. Maybe on the order of 1HP
                              > per 100 pounds. Today's engines might have 10-20 HP output per 100
                              > pounds of weight. Refer back to the comments about Rescue Minor and
                              > how the bow acts without the motor weight that Atkin specified for an
                              > example.
                              >
                              > So back when Atkin was designing, motors were very underpowered and
                              > the hull really needed to be "slippery" to fully take advantage of
                              > the low power that was available in those days from IC engines. And
                              > yes, I know I'm sorta downplaying, for now, the effect that torque
                              > has on turning a large propeller slowly.
                              >
                              > Based on my reading, early displacement power boat hulls evolved from
                              > sailboat hulls that were "sorta" efficient. Obviously the science of
                              > designing efficient displacement power boat hulls progressed rapidly –
                              > as NA's learned what worked best and what was less desirable.
                              >
                              > It seems to me that as engines become both more powerful and the
                              > power to weight ratio improved, that the hull shapes started moving
                              > away from what slipped through the water easiest and began evolving
                              > into the "fat-ish" hulls of trawlers and cargo boats and that
                              > evolution has progressed into the modern plastic floating apartments
                              > that grace (or is that disgrace?) trade magazines and marina's the
                              > world over.
                              >
                              > Having recently read a history of the Whitehall Rowing boat, I began
                              > to wonder why this hull form, with its fine entry, generous mid-
                              > section and wineglass stern wasn't expanded upon for inboard power.
                              > What's the drawback from scaling this general design up to make it a
                              > 30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                              > couldn't one incorporate the fine entry, general midships section and
                              > the fine stern sections into a power boat hull? To my very untrained
                              > eye, it appears that Atkin did use some of these three design
                              > principles in several of his designs.
                              >
                              > IIRC, from Gerr's books and others, a large diameter, aggressively
                              > pitched slow turning propeller is more efficient for moving a
                              > displacement hull than a smaller less pitched propeller turning at
                              > higher speeds. Or is my memory getting as gray as my hair?
                              >
                              > It seems to be a difficult task in today's world to find folks that
                              > agree with this philosophy. Almost all modern (inboard diesel) boat
                              > propulsion systems rely on high speed engines – many with
                              > turbochargers – to turn a smaller wheel. Gear ratio's in the 2:1 –
                              > 2.5:1 are common. This translates into prop RPM's from the low range
                              > of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                              > to 3600 RPM.
                              >
                              > Yet just a few decades ago we had engines that idled at 300-400 RPM
                              > (or less) and had an operating RPM range from 700 to 1200. These
                              > engines ran for literally tens of thousands of hours nearly trouble
                              > free. Nowadays we often hear of inboard diesels needing replacement
                              > in as little as 2000 operating hours. Throwaway power. Yuck!
                              >
                              > I believe that we can generally agree that 1) how/where you want to
                              > go with a boat, 2) how long you want to stay aboard and 3) how
                              > much `camping' you're willing to tolerate determines what type, size
                              > and amenities we'll need. And finally, 4) aesthetics. How a boat
                              > looks to our eye is vital. And as each of us has different needs and
                              > tastes, I believe all 4 of these considerations are classic cases
                              > where Your Mileage May Vary. ;-)
                              >
                              > Addressing #1. My wife is a teacher and a decade younger – I want to
                              > be able to put the boat on a trailer and go for her summer vacation
                              > to Alaska via the inside passage this summer, The Erie Canal next –
                              > Maine and Nova Scotia another – Trent-Severn waterway another. When
                              > we're both retired then on to the Bahamas for the winter and back to
                              > Alaska for an extended trip. Maybe put it aboard a freighter and
                              > ship it to France for a couple of years living on the European canal
                              > system.
                              >
                              > Addressing #2. At first we're only talking about 10-12 weeks at a
                              > stretch. Later it could be full time for a few years – or at least 8-
                              > 9 months out of 12.
                              >
                              > Addressing #3. At first – we can tolerate a bit more `roughing it'
                              > for a few weeks, but some of the things that we will not do without –
                              > (not an all inclusive list) 1) space to get away from each other when
                              > need to. 2) a great galley with room enough to prepare a full meal
                              > without contortions of the body or with the pots and pans. 3) full
                              > length and width berth(s) with comfy mattresses. 4) a separate full
                              > sized shower – no sopping TP! 5) an all weather pilot station –
                              > either fully enclosed or enclosable with canvas.
                              >
                              > Addressing #4. I just plain like boats that look like a classic
                              > boat. None of this plastic fantastic modern European shapes for me.
                              > Give me the lines of an Elco or a Lake Union Dream Boat or a double
                              > ended Salmon Troller or the shape of a Whitehall. Give me a nice
                              > sheer and a plumb bow. How about bronze ports – either oval or
                              > round – and a rearward sloping windshield instead of that forward
                              > sloping monstrosity, regardless of how practical it is. Bottom
                              > line? Spare me the angular constructs that adorn so many marina's
                              > and boat shows.
                              >
                              > Finally, I think we can all agree that petroleum products – oil, gas,
                              > natural gas and diesel fuel – are just going to get more and more
                              > expensive. The days of a buck a gallon diesel are probably long
                              > gone. So this means that to have a boat that I can afford to
                              > operate, it must be very efficient. I'd consider 7-10 statute MPG
                              > the minimum – this should equate to less than 1 gallon per hour of
                              > running, in other words, 6-8 knots cruising speed at less than 1
                              > GPH. Better than that is just that, better. I think that this is
                              > achievable in a 35'-ish boat if we don't load it down with a ton of
                              > canned goods. Something less than 20,000 pounds – 15,0000 better
                              > yet - fully ready to cruise would be the goal. My preliminary
                              > investigations and calculations indicate that given the right hull
                              > design and using modern epoxy/ply building methods this appears to be
                              > an achievable goal.
                              >
                              > Finally, utilize a big ol' slow turning engine with either a VPP or a
                              > big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                              > the most efficient fuel consumption RPM for the engine – probably
                              > less than 1500 RPM - and one should have a boat that one could afford
                              > to build and run without breaking the 401k and would be worthy of
                              > being called a Retirement Cruiser.
                              >
                              >
                              > Addressing Manfred's comments about River Belle – This would be a
                              > perfect boat for cruising the ICW and the various canals, waterways
                              > and rivers. But would this design be suitable for an Alaska trip or
                              > a trip to the Bahamas or a summer on the Great Lakes or the coast of
                              > Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                              > think to go to all the various places that I'd like to visit before I
                              > die, I need a boat with some sort of keel and the ability to take
                              > some rough weather should the unfortunate happen.
                              >
                              > Any other suggestions?
                              >
                              > Best,
                              >
                              > Leo





                              No flaming, cursing, politics, religion or public mopery. Please be
                              polite.

                              If you set out to build an Atkin boat, please do not modify the plans. If
                              you stray from the plans you do so at your own risk and Atkin & Co. will
                              take no responsibility for the performance of the resulting boat.

                              The current Atkin boat plans catalog is online at
                              <http://www.atkinboatplans.com/>





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                              [Non-text portions of this message have been removed]
                            • Mike Dolph
                              Hi Lewis, I think you made some good choices in study plans. You will have some nice options and hopefully a lot of insight into the actual construction of
                              Message 14 of 30 , Jan 18, 2005
                              • 0 Attachment
                                Hi Lewis,

                                I think you made some good choices in study plans. You will have
                                some nice options and hopefully a lot of insight into the actual
                                construction of the tunneldrive "ala Atkins". If if the plans are
                                very instructive let us know; I'd gladly pay $10.00 to see how it's
                                done.

                                One caution: make sure your belt drive incorporates a thrust bearing
                                to absorb the push of the propeller and impart it to the hull
                                structure.

                                John Dolph

                                --- In AtkinBoats@yahoogroups.com, "Lewis E. Gordon"
                                <l_gordon_nica@y...> wrote:
                                >
                                > Leo,
                                >
                                > Wow, you certainly have stirred up some good responses on this
                                thread
                                > and the previous! I too am looking for a cruising boat to build; but
                                > my cruising would be on a lake about 100 miles long by 40 miles wide
                                > so the size requirements are different. However, the cost of diesel
                                > fuel here in Nicaragua is high (not as high as Europe) and I am
                                > looking for a very efficient hull in the 23-26 foot range. I would
                                > like to use an agriculture air-cooled engine in the 6.6 to 13 HP
                                range
                                > with belt drive. I can buy a 6.6 for $639 and an 11 HP was quoted at
                                > about $1,300.
                                >
                                > I really like the idea of a motorsailer for the assist it can give
                                as
                                > well as dampening the motion in these sometimes (well lots of the
                                > time) rough waters. Some of the local transportation pangas use a
                                9.9
                                > to 15 HP outboard and a sail. So, today the check was put in the
                                mail
                                > for study plans of "Little Water", "Little Silver" and "Lady of the
                                > Lake". Okay, I know a stern-wheeler is not efficient, but "Lady of
                                the
                                > Lake" is for another project!
                                >
                                > Mr. Robb White suggested "Little Water" but it is a fishing boat and
                                > the cabin is minimal. Still, it looks attractive even though I don't
                                > need the extreme shoal draft. (One inch draft per foot of deck
                                length
                                > would be fine.) "Little Silver" is a V-bottom motor-sailor with a
                                nice
                                > cabin. I wish I could remember the design where the Atkins compared
                                > the SeaBright Skiff based designs with V-bottom designs. For our
                                lake
                                > conditions, the V-bottom may be the way to go.
                                >
                                > Oh, some more design considerations! Exterior plywood is almost
                                > impossible to buy, and forget about marine grade! Good boatbuilding
                                > woods are available but not cheap; and forget about asking for
                                > quarter-sawn! There is a good wood here for steam bending (locals
                                soak
                                > it in water) but I haven't priced it yet. And I won't be building
                                > alone. Our young carpenter working on things for the house is an
                                > artist with wood and his rates are affordable!
                                >
                                > I love this group!
                                >
                                > Lewis
                                >
                                > p.s. And I haven't entirely excluded Russell R. as a cheap option!
                                >
                                >
                                > --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
                                > >
                                > > Back when internal combustion engines were first becoming
                                available –
                                > > whether gas or diesel – these engines were massive chunks of cast
                                > > iron and had very low HP to weight ratios. Maybe on the order of
                                1HP
                                > > per 100 pounds. Today's engines might have 10-20 HP output per
                                100
                                > > pounds of weight. Refer back to the comments about Rescue Minor
                                and
                                > > how the bow acts without the motor weight that Atkin specified
                                for an
                                > > example.
                                > >
                                > > So back when Atkin was designing, motors were very underpowered
                                and
                                > > the hull really needed to be "slippery" to fully take advantage
                                of
                                > > the low power that was available in those days from IC engines.
                                And
                                > > yes, I know I'm sorta downplaying, for now, the effect that
                                torque
                                > > has on turning a large propeller slowly.
                                > >
                                > > Based on my reading, early displacement power boat hulls evolved
                                from
                                > > sailboat hulls that were "sorta" efficient. Obviously the
                                science of
                                > > designing efficient displacement power boat hulls progressed
                                rapidly –
                                > > as NA's learned what worked best and what was less desirable.
                                > >
                                > > It seems to me that as engines become both more powerful and the
                                > > power to weight ratio improved, that the hull shapes started
                                moving
                                > > away from what slipped through the water easiest and began
                                evolving
                                > > into the "fat-ish" hulls of trawlers and cargo boats and that
                                > > evolution has progressed into the modern plastic floating
                                apartments
                                > > that grace (or is that disgrace?) trade magazines and marina's
                                the
                                > > world over.
                                > >
                                > > Having recently read a history of the Whitehall Rowing boat, I
                                began
                                > > to wonder why this hull form, with its fine entry, generous mid-
                                > > section and wineglass stern wasn't expanded upon for inboard
                                power.
                                > > What's the drawback from scaling this general design up to make
                                it a
                                > > 30-40 footer? Perhaps direct 1:1 scaling isn't practical, but
                                why
                                > > couldn't one incorporate the fine entry, general midships section
                                and
                                > > the fine stern sections into a power boat hull? To my very
                                untrained
                                > > eye, it appears that Atkin did use some of these three design
                                > > principles in several of his designs.
                                > >
                                > > IIRC, from Gerr's books and others, a large diameter,
                                aggressively
                                > > pitched slow turning propeller is more efficient for moving a
                                > > displacement hull than a smaller less pitched propeller turning
                                at
                                > > higher speeds. Or is my memory getting as gray as my hair?
                                > >
                                > > It seems to be a difficult task in today's world to find folks
                                that
                                > > agree with this philosophy. Almost all modern (inboard diesel)
                                boat
                                > > propulsion systems rely on high speed engines – many with
                                > > turbochargers – to turn a smaller wheel. Gear ratio's in the
                                2:1 –
                                > > 2.5:1 are common. This translates into prop RPM's from the low
                                range
                                > > of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is
                                wound
                                > > to 3600 RPM.
                                > >
                                > > Yet just a few decades ago we had engines that idled at 300-400
                                RPM
                                > > (or less) and had an operating RPM range from 700 to 1200. These
                                > > engines ran for literally tens of thousands of hours nearly
                                trouble
                                > > free. Nowadays we often hear of inboard diesels needing
                                replacement
                                > > in as little as 2000 operating hours. Throwaway power. Yuck!
                                > >
                                > > I believe that we can generally agree that 1) how/where you want
                                to
                                > > go with a boat, 2) how long you want to stay aboard and 3) how
                                > > much `camping' you're willing to tolerate determines what type,
                                size
                                > > and amenities we'll need. And finally, 4) aesthetics. How a
                                boat
                                > > looks to our eye is vital. And as each of us has different needs
                                and
                                > > tastes, I believe all 4 of these considerations are classic cases
                                > > where Your Mileage May Vary. ;-)
                                > >
                                > > Addressing #1. My wife is a teacher and a decade younger – I
                                want to
                                > > be able to put the boat on a trailer and go for her summer
                                vacation
                                > > to Alaska via the inside passage this summer, The Erie Canal
                                next –
                                > > Maine and Nova Scotia another – Trent-Severn waterway another.
                                When
                                > > we're both retired then on to the Bahamas for the winter and back
                                to
                                > > Alaska for an extended trip. Maybe put it aboard a freighter and
                                > > ship it to France for a couple of years living on the European
                                canal
                                > > system.
                                > >
                                > > Addressing #2. At first we're only talking about 10-12 weeks at
                                a
                                > > stretch. Later it could be full time for a few years – or at
                                least 8-
                                > > 9 months out of 12.
                                > >
                                > > Addressing #3. At first – we can tolerate a bit more `roughing
                                it'
                                > > for a few weeks, but some of the things that we will not do
                                without –
                                > > (not an all inclusive list) 1) space to get away from each other
                                when
                                > > need to. 2) a great galley with room enough to prepare a full
                                meal
                                > > without contortions of the body or with the pots and pans. 3)
                                full
                                > > length and width berth(s) with comfy mattresses. 4) a separate
                                full
                                > > sized shower – no sopping TP! 5) an all weather pilot station –
                                > > either fully enclosed or enclosable with canvas.
                                > >
                                > > Addressing #4. I just plain like boats that look like a classic
                                > > boat. None of this plastic fantastic modern European shapes for
                                me.
                                > > Give me the lines of an Elco or a Lake Union Dream Boat or a
                                double
                                > > ended Salmon Troller or the shape of a Whitehall. Give me a nice
                                > > sheer and a plumb bow. How about bronze ports – either oval or
                                > > round – and a rearward sloping windshield instead of that forward
                                > > sloping monstrosity, regardless of how practical it is. Bottom
                                > > line? Spare me the angular constructs that adorn so many
                                marina's
                                > > and boat shows.
                                > >
                                > > Finally, I think we can all agree that petroleum products – oil,
                                gas,
                                > > natural gas and diesel fuel – are just going to get more and more
                                > > expensive. The days of a buck a gallon diesel are probably long
                                > > gone. So this means that to have a boat that I can afford to
                                > > operate, it must be very efficient. I'd consider 7-10 statute
                                MPG
                                > > the minimum – this should equate to less than 1 gallon per hour
                                of
                                > > running, in other words, 6-8 knots cruising speed at less than 1
                                > > GPH. Better than that is just that, better. I think that this
                                is
                                > > achievable in a 35'-ish boat if we don't load it down with a ton
                                of
                                > > canned goods. Something less than 20,000 pounds – 15,0000 better
                                > > yet - fully ready to cruise would be the goal. My preliminary
                                > > investigations and calculations indicate that given the right
                                hull
                                > > design and using modern epoxy/ply building methods this appears
                                to be
                                > > an achievable goal.
                                > >
                                > > Finally, utilize a big ol' slow turning engine with either a VPP
                                or a
                                > > big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15
                                at
                                > > the most efficient fuel consumption RPM for the engine – probably
                                > > less than 1500 RPM - and one should have a boat that one could
                                afford
                                > > to build and run without breaking the 401k and would be worthy of
                                > > being called a Retirement Cruiser.
                                > >
                                > >
                                > > Addressing Manfred's comments about River Belle – This would be a
                                > > perfect boat for cruising the ICW and the various canals,
                                waterways
                                > > and rivers. But would this design be suitable for an Alaska trip
                                or
                                > > a trip to the Bahamas or a summer on the Great Lakes or the coast
                                of
                                > > Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                                > > think to go to all the various places that I'd like to visit
                                before I
                                > > die, I need a boat with some sort of keel and the ability to take
                                > > some rough weather should the unfortunate happen.
                                > >
                                > > Any other suggestions?
                                > >
                                > > Best,
                                > >
                                > > Leo
                              • j_freach
                                I just posted drawings of Martha Green in the files section under motroboat drawings. Martha Green is a wonderful little Motor Sailor only 24 long by 8 4 But
                                Message 15 of 30 , Jan 18, 2005
                                • 0 Attachment
                                  I just posted drawings of Martha Green in the files section under
                                  motroboat drawings. Martha Green is a wonderful little Motor Sailor
                                  only 24'long by 8'4" But she has full standing headroom (5'11")for
                                  most people this is enough.

                                  I did'nt realize she was a motorsailor untill I recieved the Plans.
                                  The Atkins boat site is really great but info on most of the boats is
                                  a little sparse which leads to wonderful discoveries like the fact
                                  that Martha Green is a Motorsailor.

                                  The plans call for a Atomic Four engine which puts out about 10 hp.
                                  and I've found a place where you can get a rebuilt one for under $5000
                                  So this boat can be built to Atkins specs and would perform as the
                                  designer created her to.

                                  http://www3.telus.net/Atomic_4_Eng_Service/Price_Lists.html

                                  The link above is the site from which you can get the Atomic Four as
                                  well as many other fully rebuilt old motors.

                                  Jim F
                                  --- In AtkinBoats@yahoogroups.com, "Lewis E. Gordon"
                                  <l_gordon_nica@y...> wrote:
                                  >
                                  > Leo,
                                  >
                                  > Wow, you certainly have stirred up some good responses on this thread
                                  > and the previous! I too am looking for a cruising boat to build; but
                                  > my cruising would be on a lake about 100 miles long by 40 miles wide
                                  > so the size requirements are different. However, the cost of diesel
                                  > fuel here in Nicaragua is high (not as high as Europe) and I am
                                  > looking for a very efficient hull in the 23-26 foot range. I would
                                  > like to use an agriculture air-cooled engine in the 6.6 to 13 HP range
                                  > with belt drive. I can buy a 6.6 for $639 and an 11 HP was quoted at
                                  > about $1,300.
                                  >
                                  > I really like the idea of a motorsailer for the assist it can give as
                                  > well as dampening the motion in these sometimes (well lots of the
                                  > time) rough waters. Some of the local transportation pangas use a 9.9
                                  > to 15 HP outboard and a sail. So, today the check was put in the mail
                                  > for study plans of "Little Water", "Little Silver" and "Lady of the
                                  > Lake". Okay, I know a stern-wheeler is not efficient, but "Lady of the
                                  > Lake" is for another project!
                                  >
                                  > Mr. Robb White suggested "Little Water" but it is a fishing boat and
                                  > the cabin is minimal. Still, it looks attractive even though I don't
                                  > need the extreme shoal draft. (One inch draft per foot of deck length
                                  > would be fine.) "Little Silver" is a V-bottom motor-sailor with a nice
                                  > cabin. I wish I could remember the design where the Atkins compared
                                  > the SeaBright Skiff based designs with V-bottom designs. For our lake
                                  > conditions, the V-bottom may be the way to go.
                                  >
                                  > Oh, some more design considerations! Exterior plywood is almost
                                  > impossible to buy, and forget about marine grade! Good boatbuilding
                                  > woods are available but not cheap; and forget about asking for
                                  > quarter-sawn! There is a good wood here for steam bending (locals soak
                                  > it in water) but I haven't priced it yet. And I won't be building
                                  > alone. Our young carpenter working on things for the house is an
                                  > artist with wood and his rates are affordable!
                                  >
                                  > I love this group!
                                  >
                                  > Lewis
                                  >
                                  > p.s. And I haven't entirely excluded Russell R. as a cheap option!
                                  >
                                  >
                                  > --- In AtkinBoats@yahoogroups.com, "Leo" <leochill@y...> wrote:
                                  > >
                                  > > Back when internal combustion engines were first becoming available –
                                  > > whether gas or diesel – these engines were massive chunks of cast
                                  > > iron and had very low HP to weight ratios. Maybe on the order of 1HP
                                  > > per 100 pounds. Today's engines might have 10-20 HP output per 100
                                  > > pounds of weight. Refer back to the comments about Rescue Minor and
                                  > > how the bow acts without the motor weight that Atkin specified for an
                                  > > example.
                                  > >
                                  > > So back when Atkin was designing, motors were very underpowered and
                                  > > the hull really needed to be "slippery" to fully take advantage of
                                  > > the low power that was available in those days from IC engines. And
                                  > > yes, I know I'm sorta downplaying, for now, the effect that torque
                                  > > has on turning a large propeller slowly.
                                  > >
                                  > > Based on my reading, early displacement power boat hulls evolved from
                                  > > sailboat hulls that were "sorta" efficient. Obviously the science of
                                  > > designing efficient displacement power boat hulls progressed rapidly –
                                  > > as NA's learned what worked best and what was less desirable.
                                  > >
                                  > > It seems to me that as engines become both more powerful and the
                                  > > power to weight ratio improved, that the hull shapes started moving
                                  > > away from what slipped through the water easiest and began evolving
                                  > > into the "fat-ish" hulls of trawlers and cargo boats and that
                                  > > evolution has progressed into the modern plastic floating apartments
                                  > > that grace (or is that disgrace?) trade magazines and marina's the
                                  > > world over.
                                  > >
                                  > > Having recently read a history of the Whitehall Rowing boat, I began
                                  > > to wonder why this hull form, with its fine entry, generous mid-
                                  > > section and wineglass stern wasn't expanded upon for inboard power.
                                  > > What's the drawback from scaling this general design up to make it a
                                  > > 30-40 footer? Perhaps direct 1:1 scaling isn't practical, but why
                                  > > couldn't one incorporate the fine entry, general midships section and
                                  > > the fine stern sections into a power boat hull? To my very untrained
                                  > > eye, it appears that Atkin did use some of these three design
                                  > > principles in several of his designs.
                                  > >
                                  > > IIRC, from Gerr's books and others, a large diameter, aggressively
                                  > > pitched slow turning propeller is more efficient for moving a
                                  > > displacement hull than a smaller less pitched propeller turning at
                                  > > higher speeds. Or is my memory getting as gray as my hair?
                                  > >
                                  > > It seems to be a difficult task in today's world to find folks that
                                  > > agree with this philosophy. Almost all modern (inboard diesel) boat
                                  > > propulsion systems rely on high speed engines – many with
                                  > > turbochargers – to turn a smaller wheel. Gear ratio's in the 2:1 –
                                  > > 2.5:1 are common. This translates into prop RPM's from the low range
                                  > > of 750 RPM to a high of 1800 RPM when the 2:1 geared engine is wound
                                  > > to 3600 RPM.
                                  > >
                                  > > Yet just a few decades ago we had engines that idled at 300-400 RPM
                                  > > (or less) and had an operating RPM range from 700 to 1200. These
                                  > > engines ran for literally tens of thousands of hours nearly trouble
                                  > > free. Nowadays we often hear of inboard diesels needing replacement
                                  > > in as little as 2000 operating hours. Throwaway power. Yuck!
                                  > >
                                  > > I believe that we can generally agree that 1) how/where you want to
                                  > > go with a boat, 2) how long you want to stay aboard and 3) how
                                  > > much `camping' you're willing to tolerate determines what type, size
                                  > > and amenities we'll need. And finally, 4) aesthetics. How a boat
                                  > > looks to our eye is vital. And as each of us has different needs and
                                  > > tastes, I believe all 4 of these considerations are classic cases
                                  > > where Your Mileage May Vary. ;-)
                                  > >
                                  > > Addressing #1. My wife is a teacher and a decade younger – I want to
                                  > > be able to put the boat on a trailer and go for her summer vacation
                                  > > to Alaska via the inside passage this summer, The Erie Canal next –
                                  > > Maine and Nova Scotia another – Trent-Severn waterway another. When
                                  > > we're both retired then on to the Bahamas for the winter and back to
                                  > > Alaska for an extended trip. Maybe put it aboard a freighter and
                                  > > ship it to France for a couple of years living on the European canal
                                  > > system.
                                  > >
                                  > > Addressing #2. At first we're only talking about 10-12 weeks at a
                                  > > stretch. Later it could be full time for a few years – or at least 8-
                                  > > 9 months out of 12.
                                  > >
                                  > > Addressing #3. At first – we can tolerate a bit more `roughing it'
                                  > > for a few weeks, but some of the things that we will not do without –
                                  > > (not an all inclusive list) 1) space to get away from each other when
                                  > > need to. 2) a great galley with room enough to prepare a full meal
                                  > > without contortions of the body or with the pots and pans. 3) full
                                  > > length and width berth(s) with comfy mattresses. 4) a separate full
                                  > > sized shower – no sopping TP! 5) an all weather pilot station –
                                  > > either fully enclosed or enclosable with canvas.
                                  > >
                                  > > Addressing #4. I just plain like boats that look like a classic
                                  > > boat. None of this plastic fantastic modern European shapes for me.
                                  > > Give me the lines of an Elco or a Lake Union Dream Boat or a double
                                  > > ended Salmon Troller or the shape of a Whitehall. Give me a nice
                                  > > sheer and a plumb bow. How about bronze ports – either oval or
                                  > > round – and a rearward sloping windshield instead of that forward
                                  > > sloping monstrosity, regardless of how practical it is. Bottom
                                  > > line? Spare me the angular constructs that adorn so many marina's
                                  > > and boat shows.
                                  > >
                                  > > Finally, I think we can all agree that petroleum products – oil, gas,
                                  > > natural gas and diesel fuel – are just going to get more and more
                                  > > expensive. The days of a buck a gallon diesel are probably long
                                  > > gone. So this means that to have a boat that I can afford to
                                  > > operate, it must be very efficient. I'd consider 7-10 statute MPG
                                  > > the minimum – this should equate to less than 1 gallon per hour of
                                  > > running, in other words, 6-8 knots cruising speed at less than 1
                                  > > GPH. Better than that is just that, better. I think that this is
                                  > > achievable in a 35'-ish boat if we don't load it down with a ton of
                                  > > canned goods. Something less than 20,000 pounds – 15,0000 better
                                  > > yet - fully ready to cruise would be the goal. My preliminary
                                  > > investigations and calculations indicate that given the right hull
                                  > > design and using modern epoxy/ply building methods this appears to be
                                  > > an achievable goal.
                                  > >
                                  > > Finally, utilize a big ol' slow turning engine with either a VPP or a
                                  > > big-ish wheel and set it up to cruise at a V/L of about 1 to 1.15 at
                                  > > the most efficient fuel consumption RPM for the engine – probably
                                  > > less than 1500 RPM - and one should have a boat that one could afford
                                  > > to build and run without breaking the 401k and would be worthy of
                                  > > being called a Retirement Cruiser.
                                  > >
                                  > >
                                  > > Addressing Manfred's comments about River Belle – This would be a
                                  > > perfect boat for cruising the ICW and the various canals, waterways
                                  > > and rivers. But would this design be suitable for an Alaska trip or
                                  > > a trip to the Bahamas or a summer on the Great Lakes or the coast of
                                  > > Maine and Nova Scotia and Newfoundland? Perhaps not. So I still
                                  > > think to go to all the various places that I'd like to visit before I
                                  > > die, I need a boat with some sort of keel and the ability to take
                                  > > some rough weather should the unfortunate happen.
                                  > >
                                  > > Any other suggestions?
                                  > >
                                  > > Best,
                                  > >
                                  > > Leo
                                • liokai2002
                                  ... forums). As you seem to have access to tank testing facilities, I wonder if it would not be a worthwhile project to take the Sea Bright tunnel stern hulls
                                  Message 16 of 30 , Jan 18, 2005
                                  • 0 Attachment
                                    --- In AtkinBoats@yahoogroups.com, "Ronald Fossum" <artemis@p...>
                                    wrote:
                                    > Manfred:
                                    >
                                    > I have read your postings here (and, I think, in other boat design
                                    forums). As you seem to have access to tank testing facilities, I
                                    wonder if it would not be a worthwhile project to take the Sea Bright
                                    tunnel stern hulls - which Atkin designed in many lengths - and model
                                    them for tank testing (for the modern builder, probably the designs
                                    which could be built of plywood would have the most interest). There
                                    is a desire to have stable, shallow draft pleasure boats that will
                                    cruise comfortably in the 15 - 18 mph range (ask any family which has
                                    a 30+ mph plastic boat and you'll find - after they've owned it a
                                    year or so - that comfortable, non-pounding would be welcomed, even
                                    if at a decreased speed). I believe that the tests would show
                                    remarkable efficiency, seakindliness and seaworthiness.
                                    >
                                    > I would think that there would be a large base for these designs in
                                    Europe with it's many river, lakes, and canals - and with fuel costs
                                    much higher there, an efficient hull using less power would seem a
                                    potential "best seller". The Atkin tunnel stern Sea Brights are not
                                    well known even in the USA, so probably not at all in Europe.
                                    Hello Ron,
                                    indeed, I would like to do this. But this is not possible for me.
                                    First, the costs to run a water tank test series are very high and
                                    I`m retired now with no personal access.
                                    Second, there have been tests with similiar hulls since more than 20
                                    years by Dr. Paul Mader ( "Maderform" hulls ). And these hulls have
                                    been developed year by year and are patented now (think, I´m up to
                                    date). They deliver hydrodynamic lift in the after third part of the
                                    hull, a very smooth water behind and nearly no whorls ( vortices )
                                    leave the hull. I have a DVD of the last tests in Berlin which shows
                                    a very smooth waterflow of the hull and a very stable course.

                                    Meanwhile there are some ships with these Maderform hulls on the
                                    BODENSEE and other waterways in Germany, which have proven their
                                    superiority over coventional designs. But as with all new
                                    developments there are a lot of established people who deny the
                                    merits of Maderform hulls although all tests and computersimulations
                                    (Navier-Stokes) have shown their superiority.

                                    Having the Maderform hulls in mind and looking at the study plans of
                                    SAND PIPER one can find "some" similiar aspects. One might be the
                                    negative deadrise at the stern. But there is more and this has to be
                                    tested. I´ll try to get the plans of SAND PIPER ( with the help of
                                    DUCKWORKS as they accept my Master Card ), build a down sized version
                                    and test it here on the Baltic. In my cellar I try to twist sheets of
                                    aircraft birch ply for a small model to gain an underwater shape like
                                    SAND PIPER, to gain the same clever waterflow. But I`m not shure to
                                    succeed. Regards, Manfred
                                  • Ronald Fossum
                                    Thank you for your response, Manfred. I have heard of, and seen reference to, Maderform hulls - but did not understand the concept. Now I think it would be
                                    Message 17 of 30 , Jan 18, 2005
                                    • 0 Attachment
                                      Thank you for your response, Manfred.

                                      I have heard of, and seen reference to, "Maderform" hulls - but did not understand the concept. Now I think it would be useful to know more. I used the Google search engine and looked for "Maderform hulls" (no results, do I want maidenform bras?) and Paul Mader (lots of stuff about a Paul Mader who is heavily involved in agriculture in 3rd world areas).

                                      Do you know of any websites that discuss/have information on Maderform hulls?

                                      Many thanks.

                                      Ron Fossum

                                      ----- Original Message -----
                                      From: liokai2002
                                      To: AtkinBoats@yahoogroups.com
                                      Sent: Tuesday, January 18, 2005 1:25 PM
                                      Subject: [AtkinBoats] Re: Most Efficient Hull??



                                      Hello Ron,
                                      indeed, I would like to do this. But this is not possible for me.
                                      First, the costs to run a water tank test series are very high and
                                      I`m retired now with no personal access.
                                      Second, there have been tests with similiar hulls since more than 20
                                      years by Dr. Paul Mader ( "Maderform" hulls ). And these hulls have
                                      been developed year by year and are patented now (think, I´m up to
                                      date). They deliver hydrodynamic lift in the after third part of the
                                      hull, a very smooth water behind and nearly no whorls ( vortices )
                                      leave the hull. I have a DVD of the last tests in Berlin which shows
                                      a very smooth waterflow of the hull and a very stable course.

                                      Meanwhile there are some ships with these Maderform hulls on the
                                      BODENSEE and other waterways in Germany, which have proven their
                                      superiority over coventional designs. But as with all new
                                      developments there are a lot of established people who deny the
                                      merits of Maderform hulls although all tests and computersimulations
                                      (Navier-Stokes) have shown their superiority.

                                      Having the Maderform hulls in mind and looking at the study plans of
                                      SAND PIPER one can find "some" similiar aspects. One might be the
                                      negative deadrise at the stern. But there is more and this has to be
                                      tested. I´ll try to get the plans of SAND PIPER ( with the help of
                                      DUCKWORKS as they accept my Master Card ), build a down sized version
                                      and test it here on the Baltic. In my cellar I try to twist sheets of
                                      aircraft birch ply for a small model to gain an underwater shape like
                                      SAND PIPER, to gain the same clever waterflow. But I`m not shure to
                                      succeed. Regards, Manfred





                                      No flaming, cursing, politics, religion or public mopery. Please be polite.

                                      If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                                      The current Atkin boat plans catalog is online at
                                      <http://www.atkinboatplans.com/>





                                      ------------------------------------------------------------------------------
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                                      c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



                                      [Non-text portions of this message have been removed]
                                    • David Lightfoot
                                      Interesting pic. Those are pretty scant sails for a boat of that displacement but I noticed that Atkin drew in vangs p&s for the gaff peak. On a smaller boat
                                      Message 18 of 30 , Jan 18, 2005
                                      • 0 Attachment
                                        Interesting pic. Those are pretty scant sails for a boat of that
                                        displacement but I noticed that Atkin drew in vangs p&s for the gaff
                                        peak. On a smaller boat that would be scary but I'm sure they will cause
                                        no big fear factor in a boat with the stability of Martha Green and would
                                        surely help he point up as well as a marconi rig. Those Atkin guys were
                                        geniouses as well as practical. No designers that I know of now are
                                        designating vangs... insurance reasons? I sail a sixteen foot dingy
                                        (sometimes) with a gaff rig and use them. Best sailing rig I know of, but
                                        just a bit harry in a gust <g>. And I want to say that a gaff rig with
                                        zero twist is a whole different animal!

                                        David Lightfoot

                                        At 08:21 AM 1/18/2005, you wrote:

                                        >I just posted drawings of Martha Green in the files section under
                                        >motroboat drawings. Martha Green is a wonderful little Motor Sailor
                                        >only 24'long by 8'4" But she has full standing headroom (5'11")for
                                        >most people this is enough.


                                        --
                                        No virus found in this outgoing message.
                                        Checked by AVG Anti-Virus.
                                        Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 1/16/2005
                                      • liokai2002
                                        Hi Ron, think you will not find Maderform Hulls using Google. Dr. Mader is a shipwright and has a wharf called Hycom in Duisburg (Germany). Suppose there
                                        Message 19 of 30 , Jan 19, 2005
                                        • 0 Attachment
                                          Hi Ron, think you will not find "Maderform Hulls" using Google. Dr.
                                          Mader is a shipwright and has a wharf called "Hycom" in Duisburg
                                          (Germany). Suppose there are many Hycoms in the Google world. When
                                          you send me your adress, I can post you some papers and pics, not
                                          professionally, just from one interested "hydrodymaniac" to another.
                                          Regards, Manfred


                                          --- In AtkinBoats@yahoogroups.com, "Ronald Fossum" <artemis@p...>
                                          wrote:
                                          > Thank you for your response, Manfred.
                                          >
                                          > I have heard of, and seen reference to, "Maderform" hulls - but did
                                          not understand the concept. Now I think it would be useful to know
                                          more. I used the Google search engine and looked for "Maderform
                                          hulls" (no results, do I want maidenform bras?) and Paul Mader (lots
                                          of stuff about a Paul Mader who is heavily involved in agriculture in
                                          3rd world areas).
                                          >
                                          > Do you know of any websites that discuss/have information on
                                          Maderform hulls?
                                          >
                                          > Many thanks.
                                          >
                                          > Ron Fossum
                                          >
                                          > ----- Original Message -----
                                          > From: liokai2002
                                          > To: AtkinBoats@yahoogroups.com
                                          > Sent: Tuesday, January 18, 2005 1:25 PM
                                          > Subject: [AtkinBoats] Re: Most Efficient Hull??
                                          >
                                          >
                                          >
                                          > Hello Ron,
                                          > indeed, I would like to do this. But this is not possible for me.
                                          > First, the costs to run a water tank test series are very high
                                          and
                                          > I`m retired now with no personal access.
                                          > Second, there have been tests with similiar hulls since more than
                                          20
                                          > years by Dr. Paul Mader ( "Maderform" hulls ). And these hulls
                                          have
                                          > been developed year by year and are patented now (think, I´m up
                                          to
                                          > date). They deliver hydrodynamic lift in the after third part of
                                          the
                                          > hull, a very smooth water behind and nearly no whorls (
                                          vortices )
                                          > leave the hull. I have a DVD of the last tests in Berlin which
                                          shows
                                          > a very smooth waterflow of the hull and a very stable course.
                                          >
                                          > Meanwhile there are some ships with these Maderform hulls on the
                                          > BODENSEE and other waterways in Germany, which have proven their
                                          > superiority over coventional designs. But as with all new
                                          > developments there are a lot of established people who deny the
                                          > merits of Maderform hulls although all tests and
                                          computersimulations
                                          > (Navier-Stokes) have shown their superiority.
                                          >
                                          > Having the Maderform hulls in mind and looking at the study plans
                                          of
                                          > SAND PIPER one can find "some" similiar aspects. One might be the
                                          > negative deadrise at the stern. But there is more and this has to
                                          be
                                          > tested. I´ll try to get the plans of SAND PIPER ( with the help
                                          of
                                          > DUCKWORKS as they accept my Master Card ), build a down sized
                                          version
                                          > and test it here on the Baltic. In my cellar I try to twist
                                          sheets of
                                          > aircraft birch ply for a small model to gain an underwater shape
                                          like
                                          > SAND PIPER, to gain the same clever waterflow. But I`m not shure
                                          to
                                          > succeed. Regards, Manfred
                                          >
                                          >
                                          >
                                          >
                                          >
                                          > No flaming, cursing, politics, religion or public mopery. Please
                                          be polite.
                                          >
                                          > If you set out to build an Atkin boat, please do not modify the
                                          plans. If you stray from the plans you do so at your own risk and
                                          Atkin & Co. will take no responsibility for the performance of the
                                          resulting boat.
                                          >
                                          > The current Atkin boat plans catalog is online at
                                          > <http://www.atkinboatplans.com/>
                                          >
                                          >
                                          >
                                          >
                                          >
                                          > --------------------------------------------------------------------
                                          ----------
                                          > Yahoo! Groups Links
                                          >
                                          > a.. To visit your group on the web, go to:
                                          > http://groups.yahoo.com/group/AtkinBoats/
                                          >
                                          > b.. To unsubscribe from this group, send an email to:
                                          > AtkinBoats-unsubscribe@yahoogroups.com
                                          >
                                          > c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
                                          Service.
                                          >
                                          >
                                          >
                                          > [Non-text portions of this message have been removed]
                                        • Lewis E. Gordon
                                          Jim, I have drooled over the plans for Martha Green for years, but the 2 11 draft is just a bit more than practical for the local waters and the cruising I
                                          Message 20 of 30 , Jan 19, 2005
                                          • 0 Attachment
                                            Jim,

                                            I have drooled over the plans for Martha Green for years, but the 2'
                                            11" draft is just a bit more than practical for the local waters and
                                            the cruising I plan on doing. Thanks for posting the drawings.

                                            Another post mentions the many virtues of "Sand Piper". This should be
                                            an efficient hull but the length and power requirements are both in
                                            excess of my requirements. I do love the slender scows/garveys type
                                            hulls. Hmmmmm!! From another thread, a 14% length reduction would put
                                            "Sand Piper" down to 26 feet.

                                            Lewis


                                            --- In AtkinBoats@yahoogroups.com, "j_freach" <j_freach@y...> wrote:
                                            >
                                            > I just posted drawings of Martha Green in the files section under
                                            > motroboat drawings. Martha Green is a wonderful little Motor Sailor
                                            > only 24'long by 8'4" But she has full standing headroom (5'11")for
                                            > most people this is enough.
                                            >
                                            > I did'nt realize she was a motorsailor untill I recieved the Plans.
                                            > The Atkins boat site is really great but info on most of the boats is
                                            > a little sparse which leads to wonderful discoveries like the fact
                                            > that Martha Green is a Motorsailor.
                                            >
                                            > The plans call for a Atomic Four engine which puts out about 10 hp.
                                            > and I've found a place where you can get a rebuilt one for under $5000
                                            > So this boat can be built to Atkins specs and would perform as the
                                            > designer created her to.
                                            >
                                            > http://www3.telus.net/Atomic_4_Eng_Service/Price_Lists.html
                                            >
                                            > The link above is the site from which you can get the Atomic Four as
                                            > well as many other fully rebuilt old motors.
                                            >
                                            > Jim F
                                          • liokai2002
                                            Lewis, I don`t think that it is wise to alter a well tested design. You will not only have to change the distance between the bulkheads bei 14 % but all other
                                            Message 21 of 30 , Jan 20, 2005
                                            • 0 Attachment
                                              Lewis, I don`t think that it is wise to alter a well tested design.
                                              You will not only have to change the distance between the bulkheads
                                              bei 14 % but all other parameters ( some with x³) and lines or you
                                              will ruin the calculated waterflow of Sandpiper. When you compare
                                              Sand Piper with Huckleberry Finn ( 50 ft ), which has a similiar
                                              shape, you will find out that there is not only an enlargement by a
                                              certain amount of percentage. The whole shape is different. I´m not a
                                              designer, but to me it seems difficult to alter the lengh of a design
                                              with an underwater shape like the Piper.

                                              But the shape of Sand Piper is so interesting for me that I would
                                              choose another option. I would try to design my own boat. Compared to
                                              the other Tunnel Designs Sand Piper does not seem to be very tricky.
                                              After calculating the length and beam I would make a model and shape
                                              the underwater part with two small sheets of birch craft ply by
                                              twisting / torturing after fixing them at the point where they are
                                              even before they have to be twisted in the other direction. This
                                              seems to work - I`ve tried it, but not yet finished. The problem ist
                                              the last 1/3 . When the model is ready, I`ll try it in the water
                                              with a balance and another model (I have already some tested "normal
                                              hulls"). The model should take some weight and when towed, it should
                                              run as even as possible at all speeds( like Rescue Minor ) and it
                                              should be able to run with minimum wake ( whorls, vortices, eddies).
                                              This might be a long way but it is a real challenge and it offers the
                                              possibility to understand the extraordinary designs of William Atkin
                                              a little bit better. Regards, Manfred




                                              --- In AtkinBoats@yahoogroups.com, "Lewis E. Gordon"
                                              <l_gordon_nica@y...> wrote:
                                              >
                                              > Jim,
                                              >
                                              > I have drooled over the plans for Martha Green for years, but the 2'
                                              > 11" draft is just a bit more than practical for the local waters and
                                              > the cruising I plan on doing. Thanks for posting the drawings.
                                              >
                                              > Another post mentions the many virtues of "Sand Piper". This should
                                              be
                                              > an efficient hull but the length and power requirements are both in
                                              > excess of my requirements. I do love the slender scows/garveys type
                                              > hulls. Hmmmmm!! From another thread, a 14% length reduction would
                                              put
                                              > "Sand Piper" down to 26 feet.
                                              >
                                              > Lewis
                                              >
                                              >
                                              > --- In AtkinBoats@yahoogroups.com, "j_freach" <j_freach@y...> wrote:
                                              > >
                                              > > I just posted drawings of Martha Green in the files section under
                                              > > motroboat drawings. Martha Green is a wonderful little Motor
                                              Sailor
                                              > > only 24'long by 8'4" But she has full standing headroom (5'11")for
                                              > > most people this is enough.
                                              > >
                                              > > I did'nt realize she was a motorsailor untill I recieved the
                                              Plans.
                                              > > The Atkins boat site is really great but info on most of the
                                              boats is
                                              > > a little sparse which leads to wonderful discoveries like the fact
                                              > > that Martha Green is a Motorsailor.
                                              > >
                                              > > The plans call for a Atomic Four engine which puts out about 10
                                              hp.
                                              > > and I've found a place where you can get a rebuilt one for under
                                              $5000
                                              > > So this boat can be built to Atkins specs and would perform as the
                                              > > designer created her to.
                                              > >
                                              > > http://www3.telus.net/Atomic_4_Eng_Service/Price_Lists.html
                                              > >
                                              > > The link above is the site from which you can get the Atomic Four
                                              as
                                              > > well as many other fully rebuilt old motors.
                                              > >
                                              > > Jim F
                                            • Ronald Fossum
                                              Thank you, Manfred, for your kind response. I would certainly appreciate any information you might have. My internet connection is DSL so large (up to 5Meg)
                                              Message 22 of 30 , Jan 21, 2005
                                              • 0 Attachment
                                                Thank you, Manfred, for your kind response. I would certainly appreciate any information you might have. My internet connection is DSL so large (up to 5Meg) file size is not an issue.

                                                My intention is to build a turnnel stern Sea Bright Skiff of about 21' 6" LOA, 6' beam and (hopefully) 6" - 7" draft. It will be powered by a high speed steam plant - total weight of under 350 lbs. - with engine rpm max at 2000rpm / 15+ shaft HP.

                                                I liked what Robb White did with his version of Rescue Minor, but I would retain the Atkin plywood construction for the area below the chines (making it of 1/2" marine plywood - 1" for the flat bottom/keel). I would develop the topsides as curved forms - much like the original Sea Bright Skiffs - and use glued plywood lapstrake planking - ala Ian Oughtred - probably of 3/8" marine plywood. If you're interested, I could scan some scaled sketches (once they're completed) and email them to you. I have a copy of "The Sea Bright Skiff and other shore boats" by Peter Guthorn as well as "Building Classic Small Craft & More Building Classic Small Craft" by John Gardner", so have researched the design fairly well. My local Public Library also has the Motor Boatings Ideal Series (complete) where the Atkins published all of their Sea Bright Designs (complete with offsets).

                                                I plan to build a 3/4" = 1' model (as Weston Farmer recommends) to further refine the design. I then hope to start actual hull construction sometime this summer and, as I am now retired, have the hull completed before the rains set in here in Portland, Oregon (usually in late October). I have some background, professionally, in wooden boatwright work, mostly in repair and restoration. I still have a LOT of clamps, etc. to make the work go easier.

                                                Any information/help you can provide would be appreciated.

                                                Ron Fossum, artemis@...

                                                ----- Original Message -----
                                                From: liokai2002
                                                To: AtkinBoats@yahoogroups.com
                                                Sent: Wednesday, January 19, 2005 2:18 AM
                                                Subject: [AtkinBoats] Re: Most Efficient Hull??



                                                Hi Ron, think you will not find "Maderform Hulls" using Google. Dr.
                                                Mader is a shipwright and has a wharf called "Hycom" in Duisburg
                                                (Germany). Suppose there are many Hycoms in the Google world. When
                                                you send me your adress, I can post you some papers and pics, not
                                                professionally, just from one interested "hydrodymaniac" to another.
                                                Regards, Manfred


                                                --- In AtkinBoats@yahoogroups.com, "Ronald Fossum" <artemis@p...>
                                                wrote:
                                                > Thank you for your response, Manfred.
                                                >
                                                > I have heard of, and seen reference to, "Maderform" hulls - but did
                                                not understand the concept. Now I think it would be useful to know
                                                more. I used the Google search engine and looked for "Maderform
                                                hulls" (no results, do I want maidenform bras?) and Paul Mader (lots
                                                of stuff about a Paul Mader who is heavily involved in agriculture in
                                                3rd world areas).
                                                >
                                                > Do you know of any websites that discuss/have information on
                                                Maderform hulls?
                                                >
                                                > Many thanks.
                                                >
                                                > Ron Fossum
                                                >
                                                > ----- Original Message -----
                                                > From: liokai2002
                                                > To: AtkinBoats@yahoogroups.com
                                                > Sent: Tuesday, January 18, 2005 1:25 PM
                                                > Subject: [AtkinBoats] Re: Most Efficient Hull??
                                                >
                                                >
                                                >
                                                > Hello Ron,
                                                > indeed, I would like to do this. But this is not possible for me.
                                                > First, the costs to run a water tank test series are very high
                                                and
                                                > I`m retired now with no personal access.
                                                > Second, there have been tests with similiar hulls since more than
                                                20
                                                > years by Dr. Paul Mader ( "Maderform" hulls ). And these hulls
                                                have
                                                > been developed year by year and are patented now (think, I´m up
                                                to
                                                > date). They deliver hydrodynamic lift in the after third part of
                                                the
                                                > hull, a very smooth water behind and nearly no whorls (
                                                vortices )
                                                > leave the hull. I have a DVD of the last tests in Berlin which
                                                shows
                                                > a very smooth waterflow of the hull and a very stable course.
                                                >
                                                > Meanwhile there are some ships with these Maderform hulls on the
                                                > BODENSEE and other waterways in Germany, which have proven their
                                                > superiority over coventional designs. But as with all new
                                                > developments there are a lot of established people who deny the
                                                > merits of Maderform hulls although all tests and
                                                computersimulations
                                                > (Navier-Stokes) have shown their superiority.
                                                >
                                                > Having the Maderform hulls in mind and looking at the study plans
                                                of
                                                > SAND PIPER one can find "some" similiar aspects. One might be the
                                                > negative deadrise at the stern. But there is more and this has to
                                                be
                                                > tested. I´ll try to get the plans of SAND PIPER ( with the help
                                                of
                                                > DUCKWORKS as they accept my Master Card ), build a down sized
                                                version
                                                > and test it here on the Baltic. In my cellar I try to twist
                                                sheets of
                                                > aircraft birch ply for a small model to gain an underwater shape
                                                like
                                                > SAND PIPER, to gain the same clever waterflow. But I`m not shure
                                                to
                                                > succeed. Regards, Manfred
                                                >
                                                >
                                                >
                                                >
                                                >
                                                > No flaming, cursing, politics, religion or public mopery. Please
                                                be polite.
                                                >
                                                > If you set out to build an Atkin boat, please do not modify the
                                                plans. If you stray from the plans you do so at your own risk and
                                                Atkin & Co. will take no responsibility for the performance of the
                                                resulting boat.
                                                >
                                                > The current Atkin boat plans catalog is online at
                                                > <http://www.atkinboatplans.com/>
                                                >
                                                >
                                                >
                                                >
                                                >
                                                > --------------------------------------------------------------------
                                                ----------
                                                > Yahoo! Groups Links
                                                >
                                                > a.. To visit your group on the web, go to:
                                                > http://groups.yahoo.com/group/AtkinBoats/
                                                >
                                                > b.. To unsubscribe from this group, send an email to:
                                                > AtkinBoats-unsubscribe@yahoogroups.com
                                                >
                                                > c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
                                                Service.
                                                >
                                                >
                                                >
                                                > [Non-text portions of this message have been removed]





                                                No flaming, cursing, politics, religion or public mopery. Please be polite.

                                                If you set out to build an Atkin boat, please do not modify the plans. If you stray from the plans you do so at your own risk and Atkin & Co. will take no responsibility for the performance of the resulting boat.

                                                The current Atkin boat plans catalog is online at
                                                <http://www.atkinboatplans.com/>





                                                ------------------------------------------------------------------------------
                                                Yahoo! Groups Links

                                                a.. To visit your group on the web, go to:
                                                http://groups.yahoo.com/group/AtkinBoats/

                                                b.. To unsubscribe from this group, send an email to:
                                                AtkinBoats-unsubscribe@yahoogroups.com

                                                c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



                                                [Non-text portions of this message have been removed]
                                              • Lewis E. Gordon
                                                Manfred, I certainly value and respect your openion on Sand Piper. It seems however that the tunnel shape of Sand Piper is not as sophisticated as some of the
                                                Message 23 of 30 , Jan 23, 2005
                                                • 0 Attachment
                                                  Manfred,

                                                  I certainly value and respect your openion on Sand Piper. It seems
                                                  however that the tunnel shape of Sand Piper is not as sophisticated as
                                                  some of the other Atkins designs, (All straight sections and no
                                                  closing of the tunnel aperture at the stern.) It is exactly because of
                                                  these straight sections that I would not be TOO hesitant in shortening
                                                  the middle sections spacing from 24 to 21 inches (leaving the ends
                                                  alone) and get the hull length down to just over 26 feet.

                                                  I would certainly be interested in learning the results of your model
                                                  testing. One attraction of the tunnel stern for me (I don't need the
                                                  extreme shallow draft) is the option of putting an access plate in a
                                                  waterproof well over the propeller to quickly clear the propeller and
                                                  shaft of seaweed (lake weed?) from above. There is a lot of floating
                                                  vegetation at various times in our lake and when the going gets rough
                                                  and I have to slow down, my outboard will sometimes pick up weeds and
                                                  cavitate. I have no experience with weedless propellers and possibly
                                                  could not stand the loss of efficiency.

                                                  Lewis




                                                  --- In AtkinBoats@yahoogroups.com, "liokai2002" <manfred.pech@w...> wrote:
                                                  >
                                                  > Lewis, I don`t think that it is wise to alter a well tested design.
                                                  > You will not only have to change the distance between the bulkheads
                                                  > bei 14 % but all other parameters ( some with x³) and lines or you
                                                  > will ruin the calculated waterflow of Sandpiper. When you compare
                                                  > Sand Piper with Huckleberry Finn ( 50 ft ), which has a similiar
                                                  > shape, you will find out that there is not only an enlargement by a
                                                  > certain amount of percentage. The whole shape is different. I´m not a
                                                  > designer, but to me it seems difficult to alter the lengh of a design
                                                  > with an underwater shape like the Piper.
                                                  >
                                                  > But the shape of Sand Piper is so interesting for me that I would
                                                  > choose another option. I would try to design my own boat. Compared to
                                                  > the other Tunnel Designs Sand Piper does not seem to be very tricky.
                                                  > After calculating the length and beam I would make a model and shape
                                                  > the underwater part with two small sheets of birch craft ply by
                                                  > twisting / torturing after fixing them at the point where they are
                                                  > even before they have to be twisted in the other direction. This
                                                  > seems to wor - I`ve tried it, but not yet finished. The problem ist
                                                  > the last 1/3 . When the model is ready, I`ll try it in the water
                                                  > with a balance and another model (I have already some tested "normal
                                                  > hulls"). The model should take some weight and when towed, it should
                                                  > run as even as possible at all speeds( like Rescue Minor ) and it
                                                  > should be able to run with minimum wake ( whorls, vortices, eddies).
                                                  > This might be a long way but it is a real challenge and it offers the
                                                  > possibility to understand the extraordinary designs of William Atkin
                                                  > a little bit better. Regards, Manfred
                                                  >
                                                  >
                                                  >
                                                  >
                                                  > --- In AtkinBoats@yahoogroups.com, "Lewis E. Gordon"
                                                  > <l_gordon_nica@y...> wrote:
                                                  > >
                                                  > > Jim,
                                                  > >
                                                  > > I have drooled over the plans for Martha Green for years, but the 2'
                                                  > > 11" draft is just a bit more than practical for the local waters and
                                                  > > the cruising I plan on doing. Thanks for posting the drawings.
                                                  > >
                                                  > > Another post mentions the many virtues of "Sand Piper". This should
                                                  > be
                                                  > > an efficient hull but the length and power requirements are both in
                                                  > > excess of my requirements. I do love the slender scows/garveys type
                                                  > > hulls. Hmmmmm!! From another thread, a 14% length reduction would
                                                  > put
                                                  > > "Sand Piper" down to 26 feet.
                                                  > >
                                                  > > Lewis
                                                  > >
                                                  > >
                                                  > > --- In AtkinBoats@yahoogroups.com, "j_freach" <j_freach@y...> wrote:
                                                  > > >
                                                  > > > I just posted drawings of Martha Green in the files section under
                                                  > > > motroboat drawings. Martha Green is a wonderful little Motor
                                                  > Sailor
                                                  > > > only 24'long by 8'4" But she has full standing headroom (5'11")for
                                                  > > > most people this is enough.
                                                  > > >
                                                  > > > I did'nt realize she was a motorsailor untill I recieved the
                                                  > Plans.
                                                  > > > The Atkins boat site is really great but info on most of the
                                                  > boats is
                                                  > > > a little sparse which leads to wonderful discoveries like the fact
                                                  > > > that Martha Green is a Motorsailor.
                                                  > > >
                                                  > > > The plans call for a Atomic Four engine which puts out about 10
                                                  > hp.
                                                  > > > and I've found a place where you can get a rebuilt one for under
                                                  > $5000
                                                  > > > So this boat can be built to Atkins specs and would perform as the
                                                  > > > designer created her to.
                                                  > > >
                                                  > > > http://www3.telus.net/Atomic_4_Eng_Service/Price_Lists.html
                                                  > > >
                                                  > > > The link above is the site from which you can get the Atomic Four
                                                  > as
                                                  > > > well as many other fully rebuilt old motors.
                                                  > > >
                                                  > > > Jim F
                                                • liokai2002
                                                  Hello Ron, tried five times to send you photos and papers of MADERFORM hulls (similiar to SAND PIPER)to your private adress artemis@p.... but all were
                                                  Message 24 of 30 , Jan 24, 2005
                                                  • 0 Attachment
                                                    Hello Ron, tried five times to send you photos and papers of
                                                    MADERFORM hulls (similiar to SAND PIPER)to your private
                                                    adress "artemis@p...." but all were rejected by Mail Delivery
                                                    Subsystem Mailer Daemon .... :" The following adress had permanent
                                                    fatal errors..". Whats my failure ? Regards, Manfred



                                                    --- In AtkinBoats@yahoogroups.com, "Ronald Fossum" <artemis@p...>
                                                    wrote:
                                                    > Thank you, Manfred, for your kind response. I would certainly
                                                    appreciate any information you might have. My internet connection is
                                                    DSL so large (up to 5Meg) file size is not an issue.
                                                    >
                                                    > My intention is to build a turnnel stern Sea Bright Skiff of about
                                                    21' 6" LOA, 6' beam and (hopefully) 6" - 7" draft. It will be powered
                                                    by a high speed steam plant - total weight of under 350 lbs. - with
                                                    engine rpm max at 2000rpm / 15+ shaft HP.
                                                    >
                                                    > I liked what Robb White did with his version of Rescue Minor, but I
                                                    would retain the Atkin plywood construction for the area below the
                                                    chines (making it of 1/2" marine plywood - 1" for the flat
                                                    bottom/keel). I would develop the topsides as curved forms - much
                                                    like the original Sea Bright Skiffs - and use glued plywood lapstrake
                                                    planking - ala Ian Oughtred - probably of 3/8" marine plywood. If
                                                    you're interested, I could scan some scaled sketches (once they're
                                                    completed) and email them to you. I have a copy of "The Sea Bright
                                                    Skiff and other shore boats" by Peter Guthorn as well as "Building
                                                    Classic Small Craft & More Building Classic Small Craft" by John
                                                    Gardner", so have researched the design fairly well. My local Public
                                                    Library also has the Motor Boatings Ideal Series (complete) where the
                                                    Atkins published all of their Sea Bright Designs (complete with
                                                    offsets).
                                                    >
                                                    > I plan to build a 3/4" = 1' model (as Weston Farmer recommends) to
                                                    further refine the design. I then hope to start actual hull
                                                    construction sometime this summer and, as I am now retired, have the
                                                    hull completed before the rains set in here in Portland, Oregon
                                                    (usually in late October). I have some background, professionally, in
                                                    wooden boatwright work, mostly in repair and restoration. I still
                                                    have a LOT of clamps, etc. to make the work go easier.
                                                    >
                                                    > Any information/help you can provide would be appreciated.
                                                    >
                                                    > Ron Fossum, artemis@p...
                                                    >
                                                    > ----- Original Message -----
                                                    > From: liokai2002
                                                    > To: AtkinBoats@yahoogroups.com
                                                    > Sent: Wednesday, January 19, 2005 2:18 AM
                                                    > Subject: [AtkinBoats] Re: Most Efficient Hull??
                                                    >
                                                    >
                                                    >
                                                    > Hi Ron, think you will not find "Maderform Hulls" using Google.
                                                    Dr.
                                                    > Mader is a shipwright and has a wharf called "Hycom" in Duisburg
                                                    > (Germany). Suppose there are many Hycoms in the Google world.
                                                    When
                                                    > you send me your adress, I can post you some papers and pics, not
                                                    > professionally, just from one interested "hydrodymaniac" to
                                                    another.
                                                    > Regards, Manfred
                                                    >
                                                    >
                                                    > --- In AtkinBoats@yahoogroups.com, "Ronald Fossum" <artemis@p...>
                                                    > wrote:
                                                    > > Thank you for your response, Manfred.
                                                    > >
                                                    > > I have heard of, and seen reference to, "Maderform" hulls - but
                                                    did
                                                    > not understand the concept. Now I think it would be useful to
                                                    know
                                                    > more. I used the Google search engine and looked for "Maderform
                                                    > hulls" (no results, do I want maidenform bras?) and Paul Mader
                                                    (lots
                                                    > of stuff about a Paul Mader who is heavily involved in
                                                    agriculture in
                                                    > 3rd world areas).
                                                    > >
                                                    > > Do you know of any websites that discuss/have information on
                                                    > Maderform hulls?
                                                    > >
                                                    > > Many thanks.
                                                    > >
                                                    > > Ron Fossum
                                                    > >
                                                    > > ----- Original Message -----
                                                    > > From: liokai2002
                                                    > > To: AtkinBoats@yahoogroups.com
                                                    > > Sent: Tuesday, January 18, 2005 1:25 PM
                                                    > > Subject: [AtkinBoats] Re: Most Efficient Hull??
                                                    > >
                                                    > >
                                                    > >
                                                    > > Hello Ron,
                                                    > > indeed, I would like to do this. But this is not possible for
                                                    me.
                                                    > > First, the costs to run a water tank test series are very
                                                    high
                                                    > and
                                                    > > I`m retired now with no personal access.
                                                    > > Second, there have been tests with similiar hulls since more
                                                    than
                                                    > 20
                                                    > > years by Dr. Paul Mader ( "Maderform" hulls ). And these
                                                    hulls
                                                    > have
                                                    > > been developed year by year and are patented now (think, I´m
                                                    up
                                                    > to
                                                    > > date). They deliver hydrodynamic lift in the after third part
                                                    of
                                                    > the
                                                    > > hull, a very smooth water behind and nearly no whorls (
                                                    > vortices )
                                                    > > leave the hull. I have a DVD of the last tests in Berlin
                                                    which
                                                    > shows
                                                    > > a very smooth waterflow of the hull and a very stable course.
                                                    > >
                                                    > > Meanwhile there are some ships with these Maderform hulls on
                                                    the
                                                    > > BODENSEE and other waterways in Germany, which have proven
                                                    their
                                                    > > superiority over coventional designs. But as with all new
                                                    > > developments there are a lot of established people who deny
                                                    the
                                                    > > merits of Maderform hulls although all tests and
                                                    > computersimulations
                                                    > > (Navier-Stokes) have shown their superiority.
                                                    > >
                                                    > > Having the Maderform hulls in mind and looking at the study
                                                    plans
                                                    > of
                                                    > > SAND PIPER one can find "some" similiar aspects. One might be
                                                    the
                                                    > > negative deadrise at the stern. But there is more and this
                                                    has to
                                                    > be
                                                    > > tested. I´ll try to get the plans of SAND PIPER ( with the
                                                    help
                                                    > of
                                                    > > DUCKWORKS as they accept my Master Card ), build a down sized
                                                    > version
                                                    > > and test it here on the Baltic. In my cellar I try to twist
                                                    > sheets of
                                                    > > aircraft birch ply for a small model to gain an underwater
                                                    shape
                                                    > like
                                                    > > SAND PIPER, to gain the same clever waterflow. But I`m not
                                                    shure
                                                    > to
                                                    > > succeed. Regards, Manfred
                                                    > >
                                                    > >
                                                    > >
                                                    > >
                                                    > >
                                                    > > No flaming, cursing, politics, religion or public mopery.
                                                    Please
                                                    > be polite.
                                                    > >
                                                    > > If you set out to build an Atkin boat, please do not modify
                                                    the
                                                    > plans. If you stray from the plans you do so at your own risk and
                                                    > Atkin & Co. will take no responsibility for the performance of
                                                    the
                                                    > resulting boat.
                                                    > >
                                                    > > The current Atkin boat plans catalog is online at
                                                    > > <http://www.atkinboatplans.com/>
                                                    > >
                                                    > >
                                                    > >
                                                    > >
                                                    > >
                                                    > > ----------------------------------------------------------------
                                                    ----
                                                    > ----------
                                                    > > Yahoo! Groups Links
                                                    > >
                                                    > > a.. To visit your group on the web, go to:
                                                    > > http://groups.yahoo.com/group/AtkinBoats/
                                                    > >
                                                    > > b.. To unsubscribe from this group, send an email to:
                                                    > > AtkinBoats-unsubscribe@yahoogroups.com
                                                    > >
                                                    > > c.. Your use of Yahoo! Groups is subject to the Yahoo!
                                                    Terms of
                                                    > Service.
                                                    > >
                                                    > >
                                                    > >
                                                    > > [Non-text portions of this message have been removed]
                                                    >
                                                    >
                                                    >
                                                    >
                                                    >
                                                    > No flaming, cursing, politics, religion or public mopery. Please
                                                    be polite.
                                                    >
                                                    > If you set out to build an Atkin boat, please do not modify the
                                                    plans. If you stray from the plans you do so at your own risk and
                                                    Atkin & Co. will take no responsibility for the performance of the
                                                    resulting boat.
                                                    >
                                                    > The current Atkin boat plans catalog is online at
                                                    > <http://www.atkinboatplans.com/>
                                                    >
                                                    >
                                                    >
                                                    >
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