cat formular

Discussion in 'Sailboats' started by wannabe, Jul 16, 2004.

  1. wannabe
    Joined: Jul 2004
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    wannabe Junior Member

    could anybody tell me if there is a ratio on length to beam for completed catamarans and catamaran hulls ?
    thanks :cool:
  2. SailDesign
    Joined: Jan 2003
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    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    Each cat HAS a ratio :), but No, there is no magic formula - all are different.

  3. tspeer
    Joined: Feb 2002
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    Location: Port Gamble, Washington, USA

    tspeer Senior Member

    See Shuttleworth's "Multihull Design Considerations for Seaworthiness". He has stability indices for both sideways wind-driven capsize and pitchpole. He recommends 40 mph as the stability factor for cruising cats.

    Most cruising cats have a distacnce between centerlines near half the waterline length. The overall beam can be misleading because of flared hulls. See Kanter's "Cruising On More Than One Hull" for a discussion of the merits of different length/beam ratios in cruising catamarans.
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