calculating planing surface area

Discussion in 'Boat Design' started by yagon, Oct 24, 2010.

  1. yagon
    Joined: Nov 2009
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    Location: Sydney

    yagon Junior Member

  2. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Jim Drake

    These papers should help-"Drake 2" has the formulas for calculating planing area:
     

    Attached Files:

  3. yagon
    Joined: Nov 2009
    Posts: 8
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    Location: Sydney

    yagon Junior Member

    thanks for this feedback - it is most helpful. Some questions:

    1. The formulas to calculate the lift from the planing surface - how do these compare to the formulas for other non-sailboard hulls?

    2. Where can I obtain a copy of the figures listed in teh first document?
     

  4. Doug Lord
    Joined: May 2009
    Posts: 16,651
    Likes: 322, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    1) I don't know-this was all I needed-and I haven't worked with it yet. There are MANY threads on this forum about planing....Drakes formulas are a bit simplified for the case of a nearly flat board...The simplest way to proceed is to watch and measure actual windsurfers. Get the exact weights, a Davis windmeter and preferably a GPS speedometer and you can get a pretty accurate idea of what is required in terms of planing area on a board. I would use that info as your #1 reference and back it up with Drakes formulas.

    2) You could try e-mailing Jim Drake-his e-mail address is at the end of the document. He has not responded to my e-mail.
     
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