Modify Sailboat to Semi planing

Discussion in 'Boat Design' started by Doug Meyer, Jun 14, 2013.

  1. Doug Meyer
    Joined: Jun 2013
    Posts: 63
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    Location: New Zealand

    Doug Meyer Amateur Boat Designer

    Cheers Easy, Thanks, looks like I have got a "Semi Nod" from you,PAR and Mr Eff and its a go.

    Just got to finish my Tunnel Cat (See my photos) which I built by Eye only, no calc's (Ok I admit had to build it twice to get the shape right hence the request for the "Force")
    I Need to finish off the paint and sell it to clear the workshop for the new project..
     
  2. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    I'd have gone the scale model testing route. Swimming pool or duck pond, fishing rod and line, see how the resistance changes when you exceed "hull speed", ( simply by watching the wavelength) compared to the original. Making changes with foam back and forth till you find a happy result. Or not !
     
  3. Doug Meyer
    Joined: Jun 2013
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    Location: New Zealand

    Doug Meyer Amateur Boat Designer

    Its a good idea and not on the shelf,once I have measured up the boat might build a model and have different bottoms i can change.Rod and line I hadn't thought of was going to tow it with a scale to check resistance at the different speeds.
     
  4. Doug Meyer
    Joined: Jun 2013
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    Location: New Zealand

    Doug Meyer Amateur Boat Designer

    Hi all I did it, modified the hull finally tested it today. 17ft modified sailboat cruise 12 knots top speed 18 knots. I have put 2 videos up on you tube here is the link.

    https://youtu.be/jmWanXXf6OY
     
  5. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Looks like you've done well there.
     
  6. Doug Meyer
    Joined: Jun 2013
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    Location: New Zealand

    Doug Meyer Amateur Boat Designer

    Hi Mr Eff I will be putting up pictures of the build in the next couple of weeks on you tube I will post a link when done.
     

  7. Doug Meyer
    Joined: Jun 2013
    Posts: 63
    Likes: 1, Points: 0, Legacy Rep: 18
    Location: New Zealand

    Doug Meyer Amateur Boat Designer

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