comanche 100 rudder

Discussion in 'Boat Design' started by jelfiser, Nov 6, 2014.

  1. jelfiser
    Joined: May 2006
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    jelfiser Senior Member

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

    Doug Lord Flight Ready

    Comanche

    Looks like a slight bump to me-are you sure it's a cavity? Here is another view showing what looks like a cavity to the port side of the rudder-partially behind the rudder in this shot:

    image by Onne van der Wal--click to enlarge--
     

    Attached Files:

  3. Sailplan
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    Sailplan Junior Member

    Is it simply to create a completely flat area that acts like an endplate?
     
  4. Petros
    Joined: Oct 2007
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    Petros Senior Member

    it is not a cavity, it is a flat section where the top edge of the rudder sweeps over the bottom surface of the hull. this way they can maintain a completely tight and consistent gap at all rudder angles between the top of the rudder and the hull. as small a gap as possible is more important than maintaining perfect surface curvature over the hull. with careful design the drag increase to hull is minimal, and much smaller penalty than having a gap between the top of the rudder and the hull. both the drag is reduced and the rudder is more effective (end plate effect).
     
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  5. Sailplan
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    Sailplan Junior Member

    Wonderful detailing from VPLP & Hodgdon Yachts
     

  6. Sailplan
    Joined: Jan 2012
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    Sailplan Junior Member

    1 person likes this.
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