Crowther Bow shape

Discussion in 'Multihulls' started by saltdragon, Jan 26, 2015.

  1. saltdragon
    Joined: Oct 2014
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    saltdragon Junior Member

    Is there any benefit in the Crowther shape of bow where the lines below the waterline are fuller than those above the waterline, 'bulb like'.

    The only other other design with them that I've seen is the little Patterson tri., it would appear to offer some of the advantages of the surface piercing type of bow, but does not appear to have become 'fashionable', perhaps ahead of it's time ?
  2. redreuben
    Joined: Jan 2009
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    redreuben redreuben

    I think the modern wave piercer with all the volume down low is the grand child of where Crowther was going with the bulb.
  3. warwick
    Joined: Jan 2012
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    Location: papakura south auckland new zealand

    warwick Senior Member

    was lock Crowther involved with the early Catana range of catamarans. I think they had the same tulip bows.

  4. Richard Woods
    Joined: Jun 2006
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    Richard Woods Woods Designs

    Yes he was, back in 1984. The choice was between his design and mine. initially we were disappointed the original Catana used Lock as designer. Then we learnt he wasn't being paid the royalties he was due, so glad in the end not to work with them

    The tulip bow is a way to get a bit more buoyancy forward and increase prismatic. They weren't bulb bows as people see on ships, which are used for different reasons. The other way to increase Cp is to use a bustle, which Lock also did on some designs

    Richard Woods of Woods Designs
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