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Thread: Tail wheel shimmy

  1. #41
    ADK_Cub's Avatar
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    Has anyone re arched their springs on there own, cold?

    Local spring shop says they donít have dies that small for there press. I have a press brake in my shop, but itís a guillotine style. I can progressively apply brakes to it along the arch, but Iím worried it might stress/kink the spring metal in concentrated areas.


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  2. #42

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    We did that successfully to J3 springs. You need something sort of round to distribute the load. Local metal store sells scrap steel discs, we sawed off a crescent shaped piece.

  3. #43
    Gordon Misch's Avatar
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    I did recently, by 5 deg. I concentrated the change near the tailwheel to reduce elevating the tail (AOA). It's working well.
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  4. #44
    BC12D-4-85's Avatar
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    As the tail wheel wears - head to spring and head to fork assembly - the AOA of the mating surfaces can decrease. Shimmy starts happening - wow!. Then larger loads for the fork like big tires or tail wheel skis are added which complicates the geometry. Adequate dampening friction and correct AOA are important. The tail of the plane is an itch that need periodic scratching without complaint.

    Gary

  5. #45
    Steve Pierce's Avatar
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    Quote Originally Posted by ADK_Cub View Post
    Has anyone re arched their springs on there own, cold?

    Local spring shop says they don’t have dies that small for there press. I have a press brake in my shop, but it’s a guillotine style. I can progressively apply brakes to it along the arch, but I’m worried it might stress/kink the spring metal in concentrated areas.


    Sent from my iPhone using SuperCub.Org
    I have rearched but prefer to have a sping shop do it. Make a template and go slow making small changes and make sure you have good radius.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Likes ADK_Cub liked this post

  6. #46

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    You say shimmy like it’s a bad thing.

    Remember, These are the Good old Days!

  7. #47

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