Modify Sailboat to Semi planing

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

  1. Doug Meyer
    Joined: Jun 2013
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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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    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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