Bulb for 49er

Discussion in 'Boat Design' started by revintage, Dec 23, 2016.

  1. revintage
    Joined: Nov 2016
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    Location: Sweden

    revintage Senior Member

    Keel foil

    Just received this "keel foil" from UK. Very robust design that will have no problems to carry a 50kg bulb. Thanks to Gareth at Windknife who made this heavy duty special version. On top is a sample of the standard profile.
    If anyone dares to answer: Please no more trimarans!
     

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  2. OzFred
    Joined: Nov 2015
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    Location: Earth

    OzFred Senior Member

    I don't have much time in a 49er, but 29° would seem to be on the verge of capsize, especially if you're single handing. They really do need to be sailed flat.

    A 50kg bulb may be equivalent to 80kg on the wire at some point of heal, but 80kg of live weight is worth double the dead weight in terms of stability.
     
  3. revintage
    Joined: Nov 2016
    Posts: 280
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    Location: Sweden

    revintage Senior Member

    Thanks Fred. Single handing is due to being without buddies to sail with :-( . Also sail area will be in the ballpark of 11 to 15 sqm. With two men hiking on the wings and 50kg bulb, full 21 sqm area will then be doable as design wind is the same as on a std 49er.

    The pic was just to decide angle of the wings, so they don´t touch water to early. So the verge of capsize was just what I was looking for. We still have 30-50cm of ice so it´s hard to do an IRL test ;-) .
     

  4. revintage
    Joined: Nov 2016
    Posts: 280
    Likes: 48, Points: 28, Legacy Rep: 10
    Location: Sweden

    revintage Senior Member

    Wings

    While the other guys where sailing their ClassIII iceyacht on the lake behind I tried the new wings. Maybe they should be angled up a little more?
     

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