scale effects

Discussion in 'Boat Design' started by samh, Jan 3, 2005.

  1. samh
    Joined: Aug 2003
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    samh Junior Member

    Being the guy in boat school interested in designs like Trekka (John Guzzwells 20 footer) and mini transats and whatnot, I repeatedly heard about the scale effects of stability.

    I am wondering if this has to do with dynamics which we didn't study, rather than statics which we did.

    Thinking about reducing the loa of a 28 footer by 7% (26' - all other particulars equal) but don't have any real basis, other than the ominous echo of "scale effects on stability" to tell me whether this is a horridly bad idea.

  2. Raggi_Thor
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    Raggi_Thor Nav.arch/Designer/Builder

  3. Dutch Peter
    Joined: Aug 2004
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    Dutch Peter Senior Member

    From: "Principle of Yachtdesign" - Larsson & Eliasson

    According H.M. Barcla the scaling of a hull wil effect the BM and GM as follows:

    BM = L^0.72
    GM = L^0.45

    L being 'original lenght/proposed lenght'

    These relations depend to some extent on the basic model!

    Hope this answers your question.
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