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  1. #1

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    How to build a counterbalanced rudder

    Been doing airplanes for a few years and I have an OS 25 that I need a home for. I found plans for a basic flat bottom so that's underway, but I can't find any procedures on building the rudders. I'm going to use twin rudders with one standard servo, so I supposed I need to put a counterbalance up front? Any of you guys have tips or photos of good rudder designs? I know how to install control horns and link the two rudders. It's just the actual building of the surfaces that I'm in the dark about.
    No kid, I said break ground and fly into the wind!

  2. #2

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    RE: How to build a counterbalanced rudder

    Jester,
    Check out the Dumas Big Swamp Buggy it uses twin rudders.
    I have ran one for years and  find no fault with the rudder design.
    I would change to a pull,pull system, using two servo rods.
    The rudders pivot 1/4 of the way back of the leading edge.
    This makes the forward  1/4 of the rudder counterbalance taking  some of the load,
    off the servo. Good luck  and happy building.

                            
                                 Having this much fun must be illega



  3. #3

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    RE: How to build a counterbalanced rudder

    Thanks for the tip. I'm building a flat bottom so that it can run on grass and such, but the drawings I found will be helpful. Any suggestions on how big the rudders should be? I'm thinking about 8x2 since I'm running a 9 inch prop, but that's really just a guess.
    No kid, I said break ground and fly into the wind!

  4. #4

    Join Date
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    RE: How to build a counterbalanced rudder

    That sounds to be a good starting point. The rudders is one of the things that need to be tested from boat to boat. Ex: heavy boat will need large rudders. You just need to try a few different ones.
    Catch a Gator by the Tail and hang on for the Ride!
    Cajun Gator Airboats, M.AB.A


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