low speed semi-swath above 100 ft

Discussion in 'Multihulls' started by dirkpitt, Apr 2, 2013.

  1. dirkpitt
    Joined: Sep 2006
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    Location: turkey

    dirkpitt Junior Member

    1-hi! i was inspecting abekin rassmussen swath boats. i realized that they have huge drafts and going in lower hulls are really drawback. why do people not prefer semi swaths?

    2-and another issue, how are they designing offshore swaths cross deck clearance height. Is it according to wave heights or is there a calculation for this.

    3- Also in semi swaths, adding a bow stem like wave piercing catamaran (with bulbous tubes) should be a positive effect for pitching by adding displacement at bowside, isn't it?

    thank you
  2. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    1) Define semi-swath
    2) Combination of wet deck (or cross deck) clearance and structure weight.
    3) No. The addition of bulbous bows (or WP bows) has a minimal effect. It only really affects the waterline length & length-displacement ratio and its benefits to a vessels design.
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