A form of supercavitation...., possibly?

Discussion in 'Boat Design' started by Baywolf, Jun 3, 2008.

  1. Baywolf
    Joined: Mar 2008
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    Location: Texas

    Baywolf Engineer, who me? ya sure

    Ok, bare with me, i am no seasoned engineer. I was pondering a wicked little idea, being that I mainly toy with bay boats I need a fast slipery hull in shallow often 10" water, so I was curious would you say; If you created a dimpled surface of a hull (similar to a golf ball) and provide a constant turbulent flow of water between the bay and the hull, meanwhile having a second tunnel with a luminal flow of water or smooth to the intake for the jet you create a form of supercavitation over the surface of water or random vortexes and reduce the drag of the hull. Would this make a hull faster of simply at the most extreme amount of drag consievable?
  2. Nomad
    Joined: Feb 2002
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    Nomad Senior Member

    A golfball like surface would increase your drag in the water. A 600 grit sanding would free up the bottom a bit. For what you ware wanting i would look into running a center tunnel with steps outside of the tunnel.
  3. Baywolf
    Joined: Mar 2008
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    Location: Texas

    Baywolf Engineer, who me? ya sure

    That's essentially what I've got right now But i've begun to ponder instead of toying with the strakes and chines, what if the actual surface could be made to react different with hull. Another thing, if you punch hundreds of tiny holes in the dimples and eject air through them at different pressures would they amplify the ventalated hull idea, and is turbulance beneath the boat so bad, I think, the more turbulant the water at the hull, (not swales) the less drag the hull deals with, but I am by all means a nooby, so set me as straight as possible, please.
  4. Baywolf
    Joined: Mar 2008
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    Baywolf Engineer, who me? ya sure

    I know no equations exists for determining turbulance, only a bit of random theory equations, but I also know turbulance has been deliberately used to control exhaust and drag off of some planes, I just don't know how turbulance in water would affect the drag of the hull.
  5. tom kane
    Joined: Nov 2003
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    tom kane Senior Member

    A form of supercavitation....possibly

    Lots of air bubbles around the hull removes the support and can make even very large boat sink completely.
  6. Knut Sand
    Joined: Apr 2003
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    Location: Kristiansand, Norway

    Knut Sand Senior Member

    I think the Russians had a torpedo for testing that were pretty blunt at the front... Don't know too much though. (Was that what they were testing with Kursk? tragic...).


    But the view from a torpedo is pretty restricted...... : ;-)
    Last edited: Jun 5, 2008

  7. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    Do a search on these topics throughout the forum - there have been a lot of discussions about this subject - and a lot of similar ideas, including some crazy claims by a few chaps.
    Dimples, bubbles, strakes, you name it - its all been covered pretty thoroughly
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