kite propelled motor boat design

Discussion in 'Boat Design' started by gabdab, Jun 15, 2009.

  1. gabdab
    Joined: Aug 2008
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    gabdab Junior Member

    Hello,
    me and a friend are fiddleing with the idea of adding kite propulsion to a motor boat.
    We came to the conclusion that two characteristics of the boat would be mandatory:
    - A frontal towing ring where to tie the kite lines and
    - a rudder maybe .. if motor itself non suitable for turning pourposes.
    Does it sound like a proper setting ?
    Where do I eventually find a rudder for a motor boat ?
     
  2. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    You can either build a rudder or adapt an old one. I assume it is an outboard from what you are saying. It is better to pull it up out of the water. It will cause a lot of drag and turbulence.
     
  3. apex1

    apex1 Guest

  4. gabdab
    Joined: Aug 2008
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    gabdab Junior Member

    ..there is no actual motor boat avilable. it is merely an idea.
    ..I knew those posts before , but I feel the need of more informations ..
    I guess I will concentrate on rudder , maybe trying to adapt a sail boat rudder to a motor boat .
     
  5. gabdab
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    gabdab Junior Member

    Would it be possible to use motor at low speed as a rudder ?
     

  6. eponodyne
    Joined: Aug 2007
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    eponodyne Senior Member

    I've given this a great deal of thought and have conducted some experiments out on the lake.

    Yes, in broad strokes, it will work and work well; a kite will certainly pull a motorboat along. If you want to move anything other than 45* each side of dead downwind, you will need a keel of some sort. Leeboards would work, but are unsightly and ungainly no matter what Mr Bolger said.

    An outboard motor will work as a rudder, though poorly. Poorly. So poorly it is very much worth the effort to ship a real rudder of some sort, and of course if it's deep enough you pick up some lateral-plane area.

    Don't attach the kite to a ring in the bow; someplace just forward of 'midship is much better, especially for reaching or pointing. For downwind work of course it's fine on the bow.

    Think light; the less weight you have to drag around, the better.
     
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