Sea Sled Design....Bay Sled

Discussion in 'Boat Design' started by kenfyoozed, Feb 18, 2021.

  1. DogCavalry
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    DogCavalry I aim to misbehave.

    I might be misremembering. Confusing the 2. I'll scrounge around. See if I can varify.
     
  2. BlueBell
    Joined: May 2017
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    BlueBell Ahhhhh...

    Ken,

    I like it so much I'm drooling.

    Why the non-flat transom base?
     
  3. kenfyoozed
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    kenfyoozed Junior Member

    I don't understand the question.......
     
  4. BlueBell
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    BlueBell Ahhhhh...

    Viewing the transom from behind, the bottom edge does not run flat port to strd, or strd to port...
    Why?
     
  5. BlueBell
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    BlueBell Ahhhhh...

    Does your outboard have a standard length leg, a long leg, or an extra long leg?
    Asking for a friend.
     
  6. kenfyoozed
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    kenfyoozed Junior Member

    Ahh, OK. Thats the way the base plans were originally drawn. Through the years the designs has gone back and forth between flat and a small inverted V. I haven't decided 100% which way I want to go. I worry a inverted V at the transom may introduce more cavitation, but then if its flat it may pound more. Always a trade off.
     
  7. BlueBell
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    BlueBell Ahhhhh...

    Would you consider making it longer and flattening that transom base?
    26' x 8'
     
  8. kenfyoozed
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    kenfyoozed Junior Member

    Its a standard length leg. At this point I'm thinking off adding an armstrong bracket. That way there's an area as a swim platform, ladder or landing larger fish area. I have an atlas power jack plate on my tritoon, and it is amazing! Ill definitely be adding this as well so I can run as deep or as shallow as I need to find the sweet spot.

    As far as lengthen it, I am not sure it would be possible with this design. Its based off a 18'x84". Im at 15% stretch on length and 9% sketch on width.
     
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  9. BlueBell
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    BlueBell Ahhhhh...

    By that you mean ventilation, no?

    That's why I ask about your leg length.
    Can you get ventilating props with lots of big fat blades for outboards?
     
  10. kenfyoozed
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    kenfyoozed Junior Member

    Ive always heard it called cavitation, since the outboard has a cavitation plate, but terms aside, its the introduction of air under the transom into the stream of water that the prop is working through. But having a hydraulic backplate should solve that issue. On my tritoon the factory set position was spot on per the formulas but raising it 3" on the jack plate picked up 8mph! Made me a believer for life.
     
  11. BlueBell
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    BlueBell Ahhhhh...

    It's always been called that and it causes confusion because cavitation is the absence of air, a vacuum that forms, pitting the prop blades.
    Damage can be severe.
    Ventilation, however, can be worked to advantage, without any damage.

    I'm ecstatic you have a power jack plate, that was my next suggestion.
     
  12. Mr Efficiency
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    Mr Efficiency Senior Member

    Specialised propellers are a cure, or partial cure, for aerated water, it is a matter of suck it and see.
     
  13. DogCavalry
    Joined: Sep 2019
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    DogCavalry I aim to misbehave.

    page2-1061-full.jpg
    Baekmo, I'm afraid I can't confirm that number. I think I must have done as you thought- conflated the numbers for Miss Demure with Miss Lakeside. Here is Miss Lakeside's prop. It would be hard to get an accurate size.
     
  14. DogCavalry
    Joined: Sep 2019
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    DogCavalry I aim to misbehave.

    Ken, all that I have been able to find, in years of determined searching, tells me there is no danger of pounding with a flat transom. Obviously, from the pictures, that is what I chose. But I know of sleds built with that slight v that perform well.
     

  15. kenfyoozed
    Joined: Mar 2005
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    kenfyoozed Junior Member

    What would be the pros and cons on a slight inverted V at the transom? The TX18 is designed as flat and the HS18 has a 1.125" tall inverted V. As of now my design has the same 1.125" inverted V.
     
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