Loading ...
Sorry, an error occurred while loading the content.

Re: [bolger] Digest Number 261

Expand Messages
  • mary fulk
    thanks, Steve. I found it shortly after sending that e-mail. Sometimes I can t find my glasses on my nose!! As far as I know, no one has built a clam skiff
    Message 1 of 1 , Nov 3, 2000
    • 0 Attachment
      thanks, Steve. I found it shortly after sending that e-mail. Sometimes I
      can't find my glasses on my nose!!

      As far as I know, no one has built a clam skiff with cabin. When I buy
      plans from Bolger, I will ask him if anyone has built it.

      george

      bolger@egroups.com wrote:

      > Bolger rules!!!
      > - no cursing
      > - stay on topic
      > - use punctuation
      > - add your comments at the TOP and SIGN your posts
      > - add some content: send "thanks!" and "ditto!" posts off-list.
      > ------------------------------------------------------------------------
      >
      > There are 3 messages in this issue.
      >
      > Topics in this digest:
      >
      > 1. Re: "Mostly Cabin" Boats
      > From: shansen@...
      > 2. Re: Blundered Pointy Skiff Near Completion
      > From: sonicwonder@...
      > 3. Re: Physics?
      > From: "Ernie Murphy" <ernie@...>
      >
      > ________________________________________________________________________
      > ________________________________________________________________________
      >
      > Message: 1
      > Date: Thu, 02 Nov 2000 03:34:16 -0000
      > From: shansen@...
      > Subject: Re: "Mostly Cabin" Boats
      >
      > --- In bolger@egroups.com, "George " <gmfulk@i...> wrote:
      > > Steve,
      > >
      > > Did you scan in the photos of clam skiff with cabin? where are
      > they?
      > >
      > > George
      >
      > George,
      >
      > I scanned it shortly after you requested it. A confirmation message
      > was sent out when I uploaded it.
      >
      > It's currently the third item down in the Files menu. What's scanned
      > are Bolger's drawings from the MAIB article.
      >
      > Steve Hansen
      >
      > ________________________________________________________________________
      > ________________________________________________________________________
      >
      > Message: 2
      > Date: Thu, 02 Nov 2000 04:24:36 -0000
      > From: sonicwonder@...
      > Subject: Re: Blundered Pointy Skiff Near Completion
      >
      > --- In bolger@egroups.com, "Richard Spelling" <richard@s...> wrote:
      > > Yes. Take pictures. Then take the boat out and bang it into the dock
      > a
      > > couple of times, drag it over some rocks, and throw some mud inside
      > it.
      > >
      > > Then you can stop worrying about the perfect finish, and have fun!
      > >
      > > I'm pretty much at the same stage with my Larsboat. Has a nice
      > pretty finish
      > > on it, and I'm hesitating to take the boat out and USE it!
      > >
      > > Will take my own advice this weekend.
      > >
      >
      > Hehe...Good to know someone else is in the same boat so to speak!
      > Pictures are now up under the "Skiffy" folder. More to come soon ...
      >
      > ________________________________________________________________________
      > ________________________________________________________________________
      >
      > Message: 3
      > Date: Thu, 02 Nov 2000 09:47:09 -0000
      > From: "Ernie Murphy" <ernie@...>
      > Subject: Re: Physics?
      >
      > "a boat would behave the same whether ballasted with 500 lbs. of
      > water, or 500 lbs of lead"
      >
      > Well, not true, let me see if I can give you a feel for this. I
      > concidered this while imagineering a catfish, which has a water-
      > filled keel.
      >
      > Imagine you have any boat, and start filling baloons with water,
      > knotting the end and tying off with string. Weigh each baloon, then
      > dump it overboard. Tie the string to the gunnel and do another. How
      > many baloons will it take to sink your boat?
      >
      > Well, not *quite* an infinite ammount. After all, the string and
      > even the baloon itself have some weight. But close.
      >
      > Now start doing the same with fishing sinkers that have the same
      > weight as a water filled baloon. As long as the weights stay off the
      > bottom they will start to pull your boat down as soon as you add the
      > first one.
      >
      > Sure, 500 pounds of water and 500 pounds of lead both weigh 500
      > pounds *in air*. Put em underwater and the water weighs.... zero,
      > nada, nothing. Just remember: all boats float cause they weigh
      > nothing.
      >
      > It's displacement you see. A 500 pound boat displaces an volumn of
      > water that if you could scoop out and take out on land and weigh it
      > would weigh... exactly 500 pounds. If the weight of water your boat
      > displaced weighed any less, your boat would be sinking.
      >
      > (Water inside the boat isn't displaced. It may be out of place, but
      > thats something different.)
      >
      > The lead will have weight underwater, as it is denser then the
      > water. A thing is good for balast under water as long as it is denser
      > then water, but only by the difference in it's weight and the weight
      > of water it displaces.
      >
      > For my 'water keel' catfish, the water filling the keel still does
      > a few useful things: It still has mass, hence it will help damp out
      > movement (it will take more time for it to heel all the way over wet
      > over dry), and also help carry it thru tacks. But, since underwater
      > water "don't weigh nothing," it will not add to the righting moment
      > till the boat heels to it's side and the keel comes out dry. And once
      > outside it gets heavy FAST, helping to stop a rollover when it's
      > getting disasterous.
      >
      > -Ernie
      >
      > --- In bolger@egroups.com, "Bill Jochems" <wjochems@s...> wrote:
      > > Estimado grupo Bolger
      > > I have a question about something which is related, I think, to
      > David
      > > Ryan's question about 100 lbs. centered vs. 50 lbs. on each side.
      > Bolger
      > > has written that water ballast is of no effect until it has been
      > lifted
      > > above the water line. I don't understand this. It seems to me
      > that weight
      > > is weight, be it water, concrete or lead; and that a boat would
      > behave the
      > > same whether ballasted with 500 lbs. of water, or 500 lbs of lead,
      > if the
      > > centers of gravity of each were the same.
      > > Bill Jochems
      > > -----Original Message-----
      > > From: David Ryan <david@c...>
      > > To: bolger@egroups.com <bolger@egroups.com>
      > > Date: Monday, October 30, 2000 10:17 AM
      > > Subject: Re: [bolger] Physics?
      > >
      > >
      > > >Hooray! Dr. Wah would be proud, even if he never did understand
      > what
      > > >I was doing in his class.
      > > >
      > > >Moving on.
      > > >
      > > >In a flat bottomed boat, is there a difference between putting 100#
      > > >dead in the center of the center, or putting 50# on each chine?
      > > >
      > > >YIBB,
      > > >
      > > >David
      > > >
      > > >
      > > >
      > > >>That's about right. Let the weight of your 900# beam act in the
      > middle;
      > > the
      > > >>lever arm is from fulcrum is then (15-3)=12', so the moment is
      > > 12*900=10800
      > > >>ft-lb. To balance the beam, you need to apply 10800/3 = 3600# on
      > the
      > > short
      > > >>end (i.e. 3*3600=10800 => equilibrium).
      > > >>
      > > >>(To figure it much, much more simply, convert your units to SI
      > metric,
      > > >>divide by 1000 and then once again by .001 ;-)
      > > >>
      > > >>Gregg Carlson
      > > >>
      > > >>At 09:58 AM 10/30/2000 -0500, you wrote:
      > > >>>FBBB --
      > > >>>
      > > >>>It's been 12 years since I cracked a physical text book (my
      > degree is
      > > >>>in fine art, go figure.)
      > > >>>
      > > >>>Anyone care to check me on this:
      > > >>>
      > > >>>A 30 foot beam that weighs 30 pounds per foot is balanced on a
      > > >>>fulcrum 3 feet from one end (and 27 feet from the other.)
      > > >>>
      > > >>>By my (suspect) calculations, there is a torque of 10935 foot-
      > pounds
      > > >>>on one side, and 135 foot-pounds on the other.
      > > >>>
      > > >>>Further (dubious) arithmetic says that if I apply 3600 pounds of
      > > >>>force directly on the end of the short side, the beam will be
      > > >>>balanced.
      > > >>>
      > > >>>Anyone wanna check my math?
      > > >>>
      > > >>>YIBB,
      > > >>>
      > > >>>David
      > > >>>
      > > >>>
      > > >>>CRUMBLING EMPIRE PRODUCTIONS
      > > >>>134 W.26th St. 12th Floor
      > > >>>New York, NY 10001
      > > >>>(212) 243-1636
      > > >>>
      > > >>>
      > > >>>Bolger rules!!!
      > > >>>- no cursing
      > > >>>- stay on topic
      > > >>>- use punctuation
      > > >>>- add your comments at the TOP and SIGN your posts
      > > >>>- add some content: send "thanks!" and "ditto!" posts off-list.
      > > >>>
      > > >>>
      > > >>
      > > >>
      > > >>
      > > >>Bolger rules!!!
      > > >>- no cursing
      > > >>- stay on topic
      > > >>- use punctuation
      > > >>- add your comments at the TOP and SIGN your posts
      > > >>- add some content: send "thanks!" and "ditto!" posts off-list.
      > > >
      > > >
      > > >CRUMBLING EMPIRE PRODUCTIONS
      > > >134 W.26th St. 12th Floor
      > > >New York, NY 10001
      > > >(212) 243-1636
      > > >
      > > >
      > > >Bolger rules!!!
      > > >- no cursing
      > > >- stay on topic
      > > >- use punctuation
      > > >- add your comments at the TOP and SIGN your posts
      > > >- add some content: send "thanks!" and "ditto!" posts off-list.
      > > >
      > > >
      >
      > ________________________________________________________________________
      > ________________________________________________________________________
    Your message has been successfully submitted and would be delivered to recipients shortly.