SWATH hull trimaran

Discussion in 'Boat Design' started by VeelaidVahur, Jun 1, 2015.

  1. VeelaidVahur
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    VeelaidVahur Junior Member

  2. TANSL
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    TANSL Senior Member

    I do not know if I understand you but can not be assimilated/compared SWATH and SWASH. They are different concepts and some of the functions of one can not be performed by the other.
    What do you mean specifically?
     
  3. Ad Hoc
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    Ad Hoc Naval Architect

    VeelaidVahur

    Firstly you're numbers of displacement 2 tonne is clearly incorrect.

    How can you build a swath hull of 9.0m length with ballast systems fuel, propulsion outfitting etc etc for 2 tonne. Its hard pushed to build a 9.0m simple monohull for 2 tonne all up, let alone a swath hull.

    The picture is more a tri-swath than a swath. Since by definition a swath only has 2 hulls, not 3.
     
  4. kerosene
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    kerosene Senior Member

  5. TANSL
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    TANSL Senior Member

    Kerosene, those are trimarans (three hulls), nothing to do witn SWATH (twin hull) or SWASH (single hull)
     
  6. kerosene
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    kerosene Senior Member

    I just added the links, not making any claims.
    The manufacturer uses term "swath like", original link uses term SWASH.

    Its interesting concept anyway.
     
  7. RHP
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    RHP Senior Member

    SWATH stands for ‘Small Waterplane Area Twin Hull’, an innovative concept for smooth service in rough seas. The buoyancy of a SWATH ship is provided by two submarine hulls connected to the upper platform by twin narrow struts from each of the submarine hulls, as shown in the image below. The cross-sectional area at the sea surface is approximately 1/6th that of a comparable size yacht and thus only a minimum part of the ship is exposed to the lifting forces of the waves while 5/6 of the buoyancy is on the submarine hulls. Additional stability is provided by the SWATH’s broad beam which is twice that of a comparable yacht and by four large stabilizers controlled by a sophisticated computer system. The idea of SWATH was taken from the principle of semi-submersible offshore rigs, which are designed to provide a working platform with minimized motions in open seas. As scuba divers and submariners will attest, one needs to be only slightly under the surface of the sea to be in a calm environment regardless of conditions on the sea surface.

    http://www.yachtsilvercloud.com/
     
  8. Ad Hoc
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    Ad Hoc Naval Architect

    That has nothing to do with how a SWATH works.
     
  9. Manfred.pech
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    Manfred.pech Senior Member

  10. BMcF
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    BMcF Senior Member

    As correctly noted in the article linked in OP, the concept is an ama-stabilized SWASH. Producing a design of one at only 9m LOA would be a real challenge and making it go 35kts only adds to that challenge; that center hull isn't easy to push to high speeds.
     

  11. Rurudyne
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    Rurudyne Senior Member

    I suppose one could say that they're working a similar distinction that stabilized monohulls are in that the amas are less about displacement but stabilization. Of course examples of various native trimaran canoes of old could likewise be called stabilized monohulls too if that was all there is to it.

    Maybe there's some percentage of overall length or displacement that some have in mind which separates an ama for stabilization from one for displacement?
     
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