ratio

Discussion in 'Multihulls' started by tlar633, Jul 22, 2009.

  1. tlar633
    Joined: Jul 2009
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Quincy, Fl

    tlar633 Junior Member

    any one know the best beam for a 20 foot tri( doesnt have to be a screamer but sparkling performer)
     
  2. bad dog
    Joined: Apr 2009
    Posts: 155
    Likes: 8, Points: 0, Legacy Rep: 93
    Location: Broken Bay, Australia

    bad dog bad dog

    For reference, some good performaing tris have the following BWL/LWL ratios:
    Dragonfly 920: 0.8914
    Corsair 750 Sprint: 0.7639
    Grainger Essential 8: 0.8718 (approx).

    Average of these samples: 0.8424

    On that basis, a 20' or 6m tri would have a beam of around 5.05m, but could be as wide as 5.3m. But keep in mind that these three samples are bigger than 20', and that may change the dynamics slightly - this response may flush out some of the more experienced designers out there.

    There is another recent thread somewhere on this forum which touches on the sweetest B/L ratio for tris - chasing the balance between longitudinal stability and driving power (righting lever) - search for it, there was some really good discussion (I think it was http://www.boatdesign.net/forums/multihulls/sink-swim-27250.html which is quite long - but well worth a skim).
     
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