Boat transom design

Discussion in 'Powerboats' started by Kastally80, Jan 20, 2018.

  1. TANSL
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    TANSL Senior Member

    I am convinced that yes, it is more, I think that the fund that you propose is going to generate "3 different waves" that will interfere with each other. The more irregular the bottom, the more irregular the wake will be and the more energy will be consumed in creating it. Everything you spend to remove the water will revert to a loss of speed. IMO.
     
  2. fallguy
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    fallguy Senior Member

    TANSL - you know I am not an expert, but is it possible the secondary waves created will have a dampening effect? I would look at this design a bit like a tri-hull or cathedral hull or tunnel hull...don't those result in less wake than say a deep vee?
     
  3. TANSL
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    TANSL Senior Member

    I think that stern will move much more water than a normal V stern. But what the OP wants is to improve the shape of the wake. I do not know what it is to improve the shape, because I do not know what it intends to do with that wake, but in any case, the wake will be much more turbulent and irregular.
     
  4. fallguy
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    fallguy Senior Member

    I won't answer for the OP, but I was assuming he wants a bigger wake. The idea that somehow a chaotic wake would be introduced from a symmetric hull gives me pause...but I really have no idea.
     
  5. jorgepease
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    jorgepease Senior Member

    These notched transoms are often used with flats boats in conjunction with a tunnel. The tunnel lifts the water up and the notch helps keep the water around the prop of the elevated outboard. In this case, if I understand correctly, the prop is still below the bottom of the boat and I don't think it's going to give you any better wake. One thing that is happening is you have reduced the planing area, you might throw off the balance and since the hull extends behind the motor you might not get the bow up at the correct angle. Pods for example are raked up to avoid that happening.
     
  6. Wayne Grabow
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    Wayne Grabow Senior Member

    You are, of course, correct. I forgot to include that the overall length of the boat, including OB, was limited for storage reasons.
     
  7. Rurudyne
    Joined: Mar 2014
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    Rurudyne Senior Member

    Just a thought: those aft projecting bits look like a dandy place to mount some adjustable trim tabs
     

  8. Kastally80
    Joined: Mar 2007
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    Kastally80 Chargui Yacht Design

    Yes correct Rurudyne ! there will be a classic folding trim tabs, as shown in the photo, or Humphree interceptors.
    Classic Trim tabs.jpg
     
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