Looking for info on Asymmetric hulled boat.

Discussion in 'Sailboats' started by bearflag, Jul 7, 2010.

  1. bearflag
    Joined: May 2010
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    Location: Thousand Oaks, California

    bearflag Inventor/Fabricator

    I found a monohull online a few weeks back that was designed to sail equally forward or backwards but keeping one side to windward and the other to the lee at all times. The boat was a bit weirder still as it looked like two different hulls on the same keel-line. The masts were not inline with the keel.

    Would be grateful if anyone knows any information on this boat, or boats like it.

    Thx.
     
  2. gggGuest
    Joined: Feb 2005
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    Location: UK

    gggGuest ...

    Usually such craft are multihulls with a main hull and a hull to windward or Leeward. Those are called Proas. The stop and reverse maniouver in place of tacking is called shunting. In many ways the concept combines the best points of trimaran and catamaran, but adds a couple of inconveniences of its own to redress the balance.

    I'm not totally convinced about the usefullness of a monohull designed to work the same way but I can see how it would work.
     
  3. bearflag
    Joined: May 2010
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    bearflag Inventor/Fabricator

    Shunting monohull... have you seen it?

    Yes, I am familiar with Pro-As

    I am talking about a "monohull" vessel I saw on the interwebs a few days ago.

    The practicality of it? I suppose that is for an individual to discern. Perhaps less heeling? Better stability? Lower windage and displacement while heeling. Less ballast needed? (with obvious downsides as well)

    The post isn't to discuss the merits of such a creature. It is to find out if anyone else has seen it/anything about it, where to look etc?

    I think it is an interesting piece of engineering on its own merits, whether it is practical, ehh.
     
  4. Doug Lord
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    Doug Lord Flight Ready

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  5. bearflag
    Joined: May 2010
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    bearflag Inventor/Fabricator

    Thanks doug, this was exactly the boat I was looking for.
     
  6. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

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    I'd be interested in what you find out if you look into it....
     
  7. bearflag
    Joined: May 2010
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    bearflag Inventor/Fabricator

    Can do.
     
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  8. ancient kayaker
    Joined: Aug 2006
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    ancient kayaker aka Terry Haines

    Interesting idea. I have never been uncomfortable with the idea of asymmetry and have created several such sailing prototypes, though they did not require shunting to change tack.

    Despite the claims of the proa fan club, a shunting boat has some drawbacks, such as the extra space to tack (one of my efforts did not tack well and often had to be boxed, a similar problem) and the design compromise of requiring fore-and-aft symmetry instead of lateral symmetry.
     

  9. MalSmith
    Joined: May 2004
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    Location: Australia

    MalSmith Boat designing looney

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