Stretching a plan

Discussion in 'Sailboats' started by rgranger, Jan 27, 2011.

  1. rgranger
    Joined: Feb 2004
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    Location: Virginia

    rgranger Junior Member


    Be gentle. I've never build a boat from scratch before. I have restored four badly neglected sailboats to my credit and now find the urge to make something that is truly mine.

    I'm looking at a sharpie plan that is 32' w/ an 8' beam. I'd like to stretch the beam to 8'6" which is a 6.25% increase and will put the length at exactly 34'.

    Seems like a nice number to me.

    My question is this. Is it really as simple as taking the original plans and increasing everything by 6.25 when I loft or am I being naive?:?:

    I have four boat building books on my shelf and none of them talk about stretching a set of plans.
  2. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Considering your proportional changes are under 10%, then sure go for it, though if you wanted a bigger stretch, then you'd run into a host of other issues.
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    If you are looking at the Chapelle sharpie, you may be ruining a perfect design. They are amazingly well behaved, balanced and fast.
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