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Thread: STI wing tip question

  1. #1
    Senior Member Kitfox Pilot's Avatar
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    Default STI wing tip question

    One wing tip fits ok and the other is to large as pictured. The top will pull down with screws I think but the bottom is a 1/4'' gap. It is a stiff piece so I can't pull it that far with screws. How would you shrink this bottom to fit? Do I just cut foam out and glue it back? I was wondering it that would mess up the airflow?
    Thanks for any input.
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    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

  2. #2
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    Default Re: STI wing tip question

    Should not be that far off IMO. Ours where a little off that we blended with some superfill. I would get in touch with Brandon and see what he advises.
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  3. #3
    Senior Member jiott's Avatar
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    Default Re: STI wing tip question

    Harlan, don't forget that after the wings are covered that area will have 2-3 layers of fabric/trim tape which will raise the upper surface of the wingtip quite a bit.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  4. #4
    Senior Member Kitfox Pilot's Avatar
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    Default Re: STI wing tip question

    But the wing tips attach to aluminum strips attached to the bottom of the cap strips. They don't get covered, it says to install them after covering. If I push hard enough to make the fit they are totally distorted.
    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

  5. #5
    Denalifox's Avatar
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    Default Re: STI wing tip question

    Harlan, Mine are also the same way. I Im using left over laker leading edge material to bridge the gap so it doesn't suck down like you mentioned
    S7 STi O-320 currently flying

  6. #6
    Senior Member jiott's Avatar
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    Default Re: STI wing tip question

    I covered my aluminum strips, mainly to bring the surface up so that the outside surface of the wingtips were flush with the outside surface of the covered wings. Anything to add thickness would work.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  7. #7
    Senior Member Kitfox Pilot's Avatar
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    Default Re: STI wing tip question

    Quote Originally Posted by Denalifox View Post
    Harlan, Mine are also the same way. I Im using left over laker leading edge material to bridge the gap so it doesn't suck down like you mentioned
    Thanks Loren, I was afraid it would stick up too much if I did that. It had crossed my mind.
    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

  8. #8
    Denalifox's Avatar
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    Default Re: STI wing tip question

    Quote Originally Posted by Kitfox Pilot View Post
    Thanks Loren, I was afraid it would stick up too much if I did that. It had crossed my mind.
    Yeah, I honestly don't know how to bring that edge in uniformly. However, Kitfox is beta testing extended wing tips that mount differently than our current tips. Wondering if the molds are any better. I suppose another option is Hysol a 1" piece of left over laker edge on the adjacent capstrip to reduce the eyesore. That way the transition stepup is done over the width of 2 ribs and not so abruptly where it attaches.
    S7 STi O-320 currently flying

  9. #9
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    Default Re: STI wing tip question

    Depending on what covering your doing would effect this more. I wanted both surfaces flush so that when oratex is on each surface they are both level. (no finish tap needed on the end with oratex) Can't tell from your pictures how far off but here is what I did. I used blue take to keep it off wing. Used the wing as a guide and used a ton of superfill, mostly because it forms good and is super light. Let it dry before removing and it gives you a nice clean line. Then tons of sanding.





    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  10. #10
    Senior Member Kitfox Pilot's Avatar
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    Default Re: STI wing tip question

    Wow your wingtip was the low part. Mine needs filled on the covering side. Haven't heard back from Brandon yet. I think I can run a hot knife through the pink foam and make a slot to squeeze it back down.. maybe..

    we are using oratex.
    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

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