Sea Sled Design....Bay Sled

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

  1. DogCavalry
    Joined: Sep 2019
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    Location: Vancouver bc

    DogCavalry I aim to misbehave.

    Unfortunately I don't know that anyone did proper quantitative analysis, Ken. The pros and cons would be slight, with such a small V. That would require testing with otherwise identical hulls, or some CFD analysis with software capable of modelling the massively turbulent piled up interacting bow waves.
    So: A small loss of lift, and therefore loss of speed and cushioning. A slightly higher focus of air and foam right at the apex of the V, making things a little harder for a single engine. Slightly higher directional stability, from the flow in the tunnel when the hull is yawed.
    Different porpoising characteristics, because the stagnation lines near the transom would be more fore-and-aft, reducing porpoising, and the reduced lift in the tunnel requiring slightly higher hull planing angle, increasing porpoising.

    How it would all work out in practice? I'd be surprised if anyone could put numbers to it. My sense of it is that you would be better served with a straight line transom.

    John
     
    Last edited: Feb 22, 2021 at 12:37 PM
  2. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    It might concentrate aerated water at the centreline, a little more. But that is a guess.
     
  3. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell Ahhhhh...

  4. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Love the teeth ! Interesting that he ends up with a boat that is effectively a tri-hull, not dissimilar to the cathedral hulls. The way those hulls originated back in the 50's or 60's, was they morphed from sleds.
     
  5. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Here's another with "good" cavitation:
     

  6. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Well, I am thinking that has to be taken "on trust", being a military vessel and all, I'd be surprised if that is the full story, or even the true story. Leaving aside the cavitation business, are we to assume the slanted connection between the "torpedoes" and the hull acts as some combination of buoyant and dynamic lift to keep it on an even keel ? How is pitch stability maintained ?
     
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