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Thread: K3 lift strut attach thread

  1. #1
    Senior Member Dusty's Avatar
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    Default K3 lift strut attach thread

    I have light corrosion around the thread that stocks out the end of the lift strut on my kf3. Is this a removable thread or a threaded plug.

  2. #2
    Senior Member cap01's Avatar
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    Default Re: K3 lift strut attach thread

    on the IV the top end of the strut threads are the adjustable rod end
    chuck
    kitfox IV 1050
    912ul warpdrive
    flying B , yelm, wa

  3. #3
    Senior Member Dusty's Avatar
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    Default Re: K3 lift strut attach thread

    Sounds the same,a female rod end on a male thread.iwould like to replace both.i only have a drawing in my assembly instructions which don't give details.An old thread in this forum leads me to believe it is replaceable,I may have the wrong end of the stick!

  4. #4
    Senior Member t j's Avatar
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    Default Re: K3 lift strut attach thread

    The threaded rod is welded to the strut.
    Tom Jones
    Classic 4 builder

  5. #5
    Senior Member Dusty's Avatar
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    Default Re: K3 lift strut attach thread

    Thanks,Not a 5 minute fix then!

  6. #6
    Super Moderator Av8r3400's Avatar
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    Default Re: K3 lift strut attach thread

    Post a photo of the corrosion. Maybe just a little clean up is all that's needed.
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
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  7. #7
    Senior Member Dusty's Avatar
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    Default Re: K3 lift strut attach thread

    I will post a photo when I figure how to post online.
    The corrosion is only surface.I had an ac engineer take a look ,he wasn't overly concerned but recommended a cleanup &crack test. His concern was how the thread was formed, If it was machined rather than rolled? There is potential for a crack to form.If the threaded portion is replaceable ,easy fix.His suggestion is to convert to a threaded plug with a male rod end.
    Has this been done by any any builders?

  8. #8
    Super Moderator Av8r3400's Avatar
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    Default Re: K3 lift strut attach thread

    Kitfox uses a welded in AN fitting like this: Link

    These are NOT a cut thread.

    In the "bad old days" Avid used a welded in socket head cap screw for some threaded rod ends. Not strictly by the FAA Book, but functional. Still they were a rolled, not cut thread.
    Av8r3400
    Kitfox Model IV
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  9. #9
    Senior Member jrevens's Avatar
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    Default Re: K3 lift strut attach thread

    They seem to have sort of a black oxide finish, and look a lot like they may be common threaded rod - hopefully Grade 8. They sure don't look like those plated AN490 rod ends. Anybody know for sure?
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
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  10. #10
    Senior Member jrevens's Avatar
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    Default Re: K3 lift strut attach thread

    Quote Originally Posted by jrevens View Post
    They seem to have sort of a black oxide finish, and look a lot like they may be common threaded rod - hopefully Grade 8. They sure don't look like those plated AN490 rod ends. Anybody know for sure?
    Actually, I believe I was thinking of the horizontal tail struts... sorry!
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
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