Pivot point on L foils

Discussion in 'Multihulls' started by Jim Caldwell, Jan 25, 2014.

  1. Jim Caldwell
    Joined: Aug 2013
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    Location: Cleveland, Ohio

    Jim Caldwell Senior Member

    I am setting up the foil trunks in the hulls and I want to be able to convert from T to L foils also. I am having trouble figuring out a lower pivot that I can change from the outside to covert back and forth form T to L foil. A recessed pin in the outside of the hull to take the weight and the bellcrank bridge to take the RM is all I have been able to come up with.
    Anyone have better ideas or examples???
     
  2. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Jim, in the past I have used a sort of trunk within a trunk where the inner trunk would support the pivot pin near or at the bottom but would be fastened at the top of the outer(main) trunk. For an all moving foil you'll need some sort of bearing to take the side loads at the lower pivot and at or near the top of the board.
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  3. Jim Caldwell
    Joined: Aug 2013
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    Jim Caldwell Senior Member

    That's a great idea, thanks Doug.
     
  4. Doug Lord
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    Doug Lord Flight Ready

    Jim, you may know this already but all the AC 72's had a trunk within a trunk. That allowed the actuator to be attached to the inner trunk instead of directly to the board so the board+foil could be easily retracted.
     

  5. kiwi_bob
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    Location: New Zealand

    kiwi_bob Junior Member

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