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RE: [bolger] Tennessee transom height question

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  • Sam Glasscock
    Thanks, Maximo--I ll give it a try. ... From: Maximo Subject: RE: [bolger] Tennessee transom height question To: bolger@yahoogroups.com
    Message 1 of 10 , Sep 1, 2008
      Thanks, Maximo--I'll give it a try.

      --- On Mon, 9/1/08, Maximo <grupos@...> wrote:

      From: Maximo <grupos@...>
      Subject: RE: [bolger] Tennessee transom height question
      To: bolger@yahoogroups.com
      Date: Monday, September 1, 2008, 9:42 AM

      Sam, on the article page in the photos section, if you switch your "view"
      configuration to "large" you could read the article, at least I can :)


      [Non-text portions of this message have been removed]
    • Chester Young
      The one data point that directly correlates to the better speed is that the engine is now turning higher rpm’s. I did put a stainless steel prop on her
      Message 2 of 10 , Sep 2, 2008
        The one data point that directly correlates to the better speed is that the
        engine is now turning higher rpm’s. I did put a stainless steel prop on
        her earlier this year, but I suspect that a tune up from a certified
        mechanic may also garner additional speed. Currently changing the oil in
        the engine every 100 hours, and the grease in the lower unit every 50 hours.
        Aside from new spark plugs there is little else for a non mechanic like
        myself to do. Getting the boat on the trailer and to a shop just has not
        happened yet. If I would quit driving her around perhaps then………..

        My wife and I chartered the Mangrove Mistress back in 2003 / 2004. I took
        my GPS and she only got 12-13 mph wide open running her 25 hp four stroke
        Honda. It was enough for me, I was hooked, at that time she would not sell
        the boat but was trying to sell the business and boat with it. If I had to
        do it over I would likely install a 25 same as I have, there is a
        significant difference between 15 mph and 10mph when traveling 20 miles or
        more at one time.



        From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf Of
        Bob Rusk
        Sent: Saturday, August 30, 2008 5:34 PM
        To: bolger@yahoogroups.com
        Subject: [bolger] Re: Tennessee transom height question


        I have long lusted after a Tennessee. I figure she'd be great here in
        the Indian River Lagoon. Early reports had her running 10 mph with 10
        hp and close to 15 mph with 15 hp (2-strokes, < 90 lbs). A calm-water
        cruise speed of 13-14 mph would be ok by me, 10 mph would not.

        I thought I had read somewhere that you were only getting 13 mph wide
        open out of EstherMae with that 25 hp motor wide open, and this had
        scared me away from the idea. I wanted to attribute her lower speed
        to having so much weight aft (25 hp 4-stroke, 15 gal fuel tank,
        seating aft of cockpit) and possibly some drag from her afterplanes.
        Is my memory of EstherMae's performance faulty? Have you done
        anything that could be credited with the speedup?

        All of my knowledge of Tennessee is anecdotal and from photos, but it
        makes for some great dream fodder. I had hoped to charter Mangrove
        Mistress for a day to learn more (she is powered with a 25 hp Honda),
        but she was sold a year or so before I was able to return to Key West
        and I couldn't find her when I finally got back down there.

        Anyway, any light you can shed on EstherMae's performance would be
        greatly appreciated.


        --- In bolger@yahoogroups. <mailto:bolger%40yahoogroups.com> com, "Chester
        Young" <chester@...> wrote:
        > Sam:
        > In the photos section, within the EstherMae folder there are two photos
        > relative to your current question.
        > Photo 6 shows the transom and a bit of the detail of the outboard style
        > mount on EstherMae. It is difficult to tell from the photos but when
        > sitting at rest with a four stroke 25hp, and a tank full of gasoline (15
        > gallons, 3' forward of the transom) the chine directly at the
        transom is no
        > more than half way submerged.
        > Photo 7 shows the transom while underway. Keep in mind that I had
        my 230
        > lbs standing on the stern to take this photo so I am adding to the
        weight in
        > the stern considerably. What I see in #7 is that the stern
        depresses when
        > slightly when underway putting the chine fully underwater.
        > Ken has it right when he said to build the transom taller and cut if
        > I have never encountered a chop that has even come close to raising
        the prop
        > out of the water, however when taking quartering wakes from a
        40'-60' boat
        > running 20 mph past the EstherMae she has done enough of a broach to
        put the
        > prop out of the water. This has happened at least 5 times in the
        last 2 ½
        > years over 4,000 miles of running. I view it as my fault for not
        being more
        > tuned to the conditions. If that is a vice then it is one of the few a
        > Tennessee has. Regardless in no case was the broach extreme enough
        to make
        > me feel as if rolling was imminent. Typically when there is a chop
        I can
        > watch small power boats, from 25' on down hobby horsing through the
        > and EstherMae just glides along, pitch is not a motion that a Tennessee
        > engages in. I suspect that this is due to the narrow beam. If you are
        > running in conditions that create much pitch you should consider
        being back
        > at the dock, as the hull is far to light for such weather. Heavy
        > also demands a speed of no more than 8-9 mph to prevent excessive
        > of the bottom, which is throttled back from the 15-18 mph she can do
        in a
        > light chop. I have never been out in anything in excess of 3' and we
        > regularly run around in 2' and less comfortably.
        > ~Caloosarat
        > _____
        > From: bolger@yahoogroups. <mailto:bolger%40yahoogroups.com> com
        [mailto:bolger@yahoogroups. <mailto:bolger%40yahoogroups.com> com] On
        Behalf Of
        > Sam Glasscock
        > Sent: Friday, August 29, 2008 12:02 AM
        > To: bolger@yahoogroups. <mailto:bolger%40yahoogroups.com> com
        > Subject: [bolger] Tennessee transom height question
        > I am starting to look for a high-thrust 9.9 for my Tennessee
        project. The
        > plans show about a 15" transom. The Yamaha high-thrusts only come
        in 20" or
        > 25" shafts. It is easy enough to raise the transom. My question
        is, how
        > much. There is some rocker in the Tennessee, I will be running her at
        > displacement speeds, so having the cavitation plate no lower than the
        > waterline is not imperative, and I want to make sure the prop stays
        in the
        > water in a chop. I assume the hull bottom at the transom is
        slightly above
        > the water, lightly loaded. I'd appreciate any advice about the optimal
        > height of the transom to accommodate a 20" shaft motor. Thanks
        > [Non-text portions of this message have been removed]
        > [Non-text portions of this message have been removed]

        [Non-text portions of this message have been removed]
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