Classic Boat Designs - Rudder and Gaff Rig Questions

Discussion in 'Boat Design' started by photjoe, Feb 14, 2005.

  1. photjoe
    Joined: Feb 2005
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    Location: Baltimore, MD

    photjoe New Member

    I was hoping someone familiar with classical designs could help.

    I'm baseing a design on a French Cutter, but due to the nature of the design the rudder is pitched. I was wondering how that effect helm balance and area. Is there any rule to follow for a well balanced helm or formula I can use to figure out how much rudder area is needed for this full keel design?

    Also what's the best Sail Area to Displacement for a gaff rig? The best compromise between speed and safety. Any tips for lead for the rig from the CLR and COE?

    Thanks,

    Joe
     
  2. mmd
    Joined: Mar 2002
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    Location: Bridgewater NS Canada

    mmd Senior Member

    I would reccommend you pick up a copy of Howard Chapelle's "Yacht Designing and Planning". It addresses most of the questions you have raised, and a lot more. Well worth the investment, even if you design only one boat.
     
  3. photjoe
    Joined: Feb 2005
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    Location: Baltimore, MD

    photjoe New Member

    Got Chapelle's, but I was looking for hints and tips. Comparing some of the full keels of today to the past golden age, the rudder areas are considerable larger on modern hulls.

    I also have Skene's Elements of Design, but it seem the actual formula for determining Sailboat Rudder area is missing from the book.

    Joe
     
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