daggerboat area

Discussion in 'Multihulls' started by Gianf1041, Apr 18, 2019.

  1. Gianf1041
    Joined: Sep 2018
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    Location: italy

    Gianf1041 Junior Member

    a question: what percentage must have the area of the catamaran centerboard compared to the sail surface?
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    For a well designed hull you don't need a centerboard. What is the hull section shape?...U or V ?
     
  3. Gianf1041
    Joined: Sep 2018
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    Location: italy

    Gianf1041 Junior Member

    Trasversal section.......!
     

    Attached Files:

  4. Doug Halsey
    Joined: Feb 2007
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    Doug Halsey Senior Member

    You trying to pick a fight?
     
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  5. Gianf1041
    Joined: Sep 2018
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    Location: italy

    Gianf1041 Junior Member

    I apologize but I didn't understand the meaning?
     
  6. Doug Halsey
    Joined: Feb 2007
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    Doug Halsey Senior Member

    My comment was directed at Jehardiman, not you. I think quite a few would disagree with what he wrote.
     
  7. Gianf1041
    Joined: Sep 2018
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    Location: italy

    Gianf1041 Junior Member

    ok, no problem, ........... sometimes I have difficulty understanding the translation from English to Italian.
     
  8. Gianf1041
    Joined: Sep 2018
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    Gianf1041 Junior Member

    however my question was on the percentage to be assigned to the surface of the drift with respect to the sail surface ..........: between 6% - 10%, ........... ratio centerboard surface - sail surface ... 0.015 - 0.025 ..... ??? are they correct parameters ???
     

  9. bruceb
    Joined: Nov 2008
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    bruceb Senior Member

    Gianf, on the smaller cat's and tri's I am used to, a board area of about 2% of windward sail area would be a starting point, at least a guide line. That is assuming a well designed high aspect board, 4:1 or longer. Faster boats boats might need less. I am using a 1.7 % area board on my old medium performance 33' tri with good results.
    B
     
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