Pacific proa pod

Discussion in 'Multihulls' started by Alex.A, Sep 7, 2010.

  1. Alex.A
    Joined: Feb 2010
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    Location: South Africa

    Alex.A Senior Member

    The theory sounds nice - proa is overpowered - goes over (capsizes!!) but is stopped by the pod and is then able to right itself........
    BUT - what is the best shape for a pod? It has to function through a variety of speeds and have enough bouyancy to support the entire proa.
    There are also not a lot of boats out there with this feature.... Russ Browns/Antrims (has one been built?) and now madness - Harris + Brown. Are there others? There are a few other cruising/ large proa's - pacific - that have not used the pod - do the just add more weight to the ama and if so why not a pod as well? Rob Denney reckons it will end up tripping the boat up - but if designed like a hull - it needn't?
    The structure would have to be simmilar to a hull and by incorporating the beams it should be plenty strong?
    It needs to pierce without slamming on the brakes or be flat and skim the water without digging in........
    What is the best shape?
     
  2. Alex.A
    Joined: Feb 2010
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    Alex.A Senior Member

    Could a foil be used instead of a pod?
     
  3. cavalier mk2
    Joined: Mar 2010
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    cavalier mk2 Senior Member

    Try thinking of a wingdeck without a outer hull for construction strength or the same scantlings as the main hull depending on shape. How about with a outer bottom edge shaped to form a low aspect foil to add lift and soften wave impacts? It should be large enough to have enough buoyancy for the righting moment you are after. A foil only needs to be moving to work.
     
  4. luckystrike
    Joined: Feb 2010
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    Location: Germany

    luckystrike Power Kraut

    Hello,

    check this! http://www.multihulldesigns.com/designs_stock/26proa.html

    Is this you are looking for? The Extra is that you get a comfortable 2by2 Meter king size bunk under the pop top.

    Grrreetings, Michel
     
  5. ThomD
    Joined: Mar 2009
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    Location: TO

    ThomD Senior Member

    "Rob Denney reckons it will end up tripping the boat up - but if designed like a hull - it needn't?

    He gives the example of tris. They trip over their hulls, which is presumably the reason nobody has built one in 30 years... I think it is a legitimate question to raise, but it doesn't seem to be a problem. He did mention higher speeds. Neither Cheers nor RB's proas are at the cutting edge imaginable, so perhaps they work at low resistance, and cruisy kinds of levels, but not at flat out operating speeds.
     
  6. sigurd
    Joined: Jun 2004
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    sigurd Pompuous Pangolin

    With the pod, the boat is probably more stable when the mast is in the water (if you tripped the "right way").

    If you can put a pod that is long, has no edge on top where it would add leeway resistance, and maybe is not wide enough to add much stability when capsized, or maybe a more logical option is to put the extra storage/sleeping space to windward, and put a sheet release mechanism connected to a tilt sensor/wand?
     

  7. Alex.A
    Joined: Feb 2010
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    Location: South Africa

    Alex.A Senior Member

    Not crazy about the pop-top.... would want minimal hull and the pod add-on would gain interior room in the middle - only berths in hulls. Maybe in the pod - but then adding wt in the wrong place? Sheet release would be good in any pac proa?
    Prefer "capsize" at slower speed - but whats the fun in that?:p
    Want all speeds covered?:D A foil and a pod :?:
     
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