14ft Racing Dinghy - Comments Please

Discussion in 'Sailboats' started by PI Design, Feb 13, 2010.

  1. PI Design
    Joined: Oct 2006
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    PI Design Senior Member

    I suppose there is some superficial resemblance, but as Chris says, it is totally different in the detail. I have the advantage of not designing this to be easy for the home builder, so can potentially get much better shapes.

    What I'm really aiming for with this design is what Frank Bethwaite tried with the Tasar X (the Tasar with the kite). He dropped the concept, partly because the kite did not provide the performance boost he wanted, and partly (presumably) because that would be a major change to an existing class and would divide the fleet.

    I don't have the latter problem (the boat is only for personal use), and by starting with a fresh hull shape I'm hoping to overcome some of the problems FB had getting the kite to boost performance in light winds. He claims this is because the 'critical ratio' for downwind sail area to total weight is not met.

    So what I'm trying to achieve is the smallest/easiest possible design that meets the Bethwaite ratios for all round skiff-like performance and also takes advantage of developments from other classes - notably the NS14 hull shapes.
     
  2. PI Design
    Joined: Oct 2006
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    PI Design Senior Member

    For my sins, I had an ISO when they first came out in 1993. That was the first British designed one-design to feature an assymetric kite and was the class that really introduced the concept to the masses (in the UK). It was designed by Ian Howlett and based upon his successful (Worlds winning) I14 designs. However, it is not what I am trying to emulate, nor do I think it is a great starting point to work from. They are far flatter (in section and rocker) than what I am looking to do.
     
  3. ned
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    ned Junior Member

    You should have a look at Javlens they are a New Zealand class and only cary one man on the wire but the will keep up to a 49er down wind but are a little bit slower up wind.
     
  4. PI Design
    Joined: Oct 2006
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    PI Design Senior Member

    Hi Ned,
    I followed the virtual Javelin site when they were designing and building them. Great and really informative site. I think the class rules were used as the basis for the NS14 hull rules?
    I've been helping on the protoype ICON dinghy which will soon be going into production here and is virtually a kiteless version of what this design is - similar to a NS14 but with bigger rig. The finalised version of the ICON will look slightly different (altered deck mould and transom) and have a centreboard rather than a dagger board.
     

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  5. Ferman
    Joined: Aug 2008
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    Ferman Junior Member

    this 4.60 meter may be interesting to build

    I designed this 4.60 m skiff it maight interest you plase coments on the design.

    Cheers
     

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  6. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    Shoot! I can't open the dxf file... I'd like to see it, though.
     
  7. Chris Ostlind

    Chris Ostlind Previous Member

    This is the plan converted to a jpeg screen shot and color altered for best read.
     

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  8. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    Thanks, Chris!
     
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