What in the world is this????

Discussion in 'Boat Design' started by rasorinc, Apr 23, 2015.

  1. rasorinc
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    rasorinc Senior Member

  2. Canracer
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    Canracer Senior Member

    Low tide?

    Looks like a twin torpedo powered foiler.
  3. sharpii2
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    sharpii2 Senior Member

    I think its called a SWATH, which stands for Small Water plane Area Twin Hull.

    The original idea was to make a vessel which would roll the least in a seaway. The secret is to have most of its displacement in underwater pods, with long, narrow top sides connecting them to a bridge deck and superstructure.

    This way, there is minimal above the water buoyancy for the waves to act on, so the vessel has a greater tendency to stay level.

    The danger with such a concept is what would likely happen if one of these pod hulls gets holed. Since there is little reserve buoyancy, compared to even conventional catamarans, such a vessel could capsize or sink with a suddenness, in such an emergency.

    This particular version has a what is in effect a boat for a bridge deck, to prevent this.
  4. Rurudyne
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    Rurudyne Senior Member


    ... that's what kind of hull it has. ;)
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    PAUL XAVIER Junior Member

    @sharpii2 But SWATH's so called "twin hulls" do not project outwards from their main body to this extend.
    And as they call it as a aircraft +boat vessel these pods would be also helping to provide the lift.
  6. Rurudyne
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    Rurudyne Senior Member

    I think it may be possible, judging by the was those junctures to the hull look linked hinges, this thing may have a variable footprint: tall or stealthy. Either that or because of the format it needs a suspension (talk about unsprung weight!).
  7. alan craig
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    alan craig Senior Member

    I would think it needs some kind of active roll stability to stop it from falling over. Hydrovanes when moving, reduced displacement when static, maybe.
  8. d1970
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    d1970 Junior Member

    Waves hitting the (flat?) bottom should prove interesting.
  9. portacruise
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    portacruise Senior Member

    I think this is an adaptation of the concept discussed in the HPB/PPB sometime ago. It has been used in super fast torpedoes (50mph?) from what I understand. Basically water resistance is eliminated because the submerged pontoons travel in an air bubble or bubbles?


    Hitting even small objects on the water at speed might be trouble.

    Last edited: Apr 26, 2015
  10. BMcF
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    BMcF Senior Member

    Good eye. The struts are rotated to nearly a vertical position as/during/after the craft takes off and achieves an operational speed. The height of the "pod" bottom is significantly increased while underway.

    The vessel is "fly by wire" with pitch and roll attitude, and steering all actively managed (stabilized) by an integrated flight control system.

  11. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    All depends what regulations and "mitigation" has been employed.

    SLICE Damaged.jpeg

  12. Rurudyne
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    Rurudyne Senior Member

    Boats like that need an inflatable pontoon equivalent of an air bag.
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