Adjustable Dinghy Hull Beam

Discussion in 'Sailboats' started by Doug Lord, May 19, 2018.

  1. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Very cool!
  2. Richard Woods
    Joined: Jun 2006
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    Location: Back full time in the UK

    Richard Woods Woods Designs

    we discussed doing that in Moths about 40 years ago!

    Richard Woods
  3. sawmaster
    Joined: May 2010
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    sawmaster Senior Member

    yeah but did anyone actually do it til now?

  4. gggGuest
    Joined: Feb 2005
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    Location: UK

    gggGuest ...

    The problem is not changing the beam per se, the problem is the consequences. Given a typical dinghy skin, with convex curves both fore and aft and laterally, if you pull the sides in the rocker reduces, and if you pull them out it increases. You can see it in the video. As conventionally one wants a narrow boat with plenty of rocker for light air, and a wide boat with less rocker for planing conditions, the conclusion I reached back in the day was that I couldn't pull the hull skin about and have both rocker and waterline beam change in the directions I wanted, instead one would tend to cancel out the other. That's why, for me, it never got beyond the thought stage. It would be interesting to know what the design aims were for this one.
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