Wing on rudder = longer boat ? Help

Discussion in 'Hydrodynamics and Aerodynamics' started by Wally2, Feb 16, 2019.

  1. Wally2
    Joined: May 2018
    Posts: 3
    Likes: 0, Points: 1
    Location: Australia

    Wally2 New Member

    Looking for some advice.

    I'm a two day forum expert on foils . :)

    I was told fitting a wing on my rudder with 0° AOA will reduce pitching and this will simulate a longer boat. I understand how that might work.

    The boat is a Schionning Waterline 1480 (48'). These are a performance cruising catamaran, weighs 7.5t loaded.

    We spend most of our time in the 8 to 16 knot range.

    What I would hope to gain....
    • Less pitching
    • Better pointing
    • More speed / VMG
    Is it realistic or am I just putting more drag on my boat.

    If it might work where do I go for design information?
     
  2. Doug Lord
    Joined: May 2009
    Posts: 16,584
    Likes: 299, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Here's a bit more on the theory. This article primarily discusses dinghies but rudder T-foils alone or in combination with a more forward foil* can help on almost any size boat.
    See the following thread.

    Multihull "foil assist"(not full flying)--
    not sure of designers name......
    DSS for multihulls.jpg
     

    Attached Files:

    Last edited: Feb 16, 2019
  3. Doug Lord
    Joined: May 2009
    Posts: 16,584
    Likes: 299, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready


  4. messabout
    Joined: Jan 2006
    Posts: 2,980
    Likes: 187, Points: 63, Legacy Rep: 1279
    Location: Lakeland Fl USA

    messabout Senior Member

    Question: would a horizontal wing on the rudder not behave as a fore and aft "flopper stopper"? If so, would that not make the boat wetter in certain sea states? Best have a really substantial set of rudder attachments as there are now vertical loads where not present before the wings. A function of the wing area I suspect.
     
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