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Thread: Spar attach fittings, flox or microballons?

  1. #51

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    Default Re: Spar attach fittings, flox or microballons?

    Another question about the spar fittings. They seem to be very tight when I slide them on a trial piece of 2 1/2" aluminum tubing and leave scratches when I take them off. How do you get them on without damaging the spar? Any suggestions would be appreciated.

  2. #52
    Senior Member aviator79's Avatar
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    Default Re: Spar attach fittings, flox or microballons?

    They are indeed tight. The Hysol that you'll smear on them will lubricate them a little as you install them. Just go slowly and carefully. They will scratch the spar a bit, but it shouldn't be so severe as to create a concern with fatigue crack initiation or stress concentration. As an extra margin, the area will be reinforced with a steel doubler (the bracket), and a liberal quantity of structural adhesive to fill any scratches.

  3. #53
    Senior Member Esser's Avatar
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    Default Re: Spar attach fittings, flox or microballons?

    Quote Originally Posted by aviator79 View Post
    They are indeed tight. The Hysol that you'll smear on them will lubricate them a little as you install them. Just go slowly and carefully. They will scratch the spar a bit, but it shouldn't be so severe as to create a concern with fatigue crack initiation or stress concentration. As an extra margin, the area will be reinforced with a steel doubler (the bracket), and a liberal quantity of structural adhesive to fill any scratches.
    And really make sure they are deburred throughly with nothing that will caus a stress riser.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  4. #54
    Senior Member jiott's Avatar
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    Default Re: Spar attach fittings, flox or microballons?

    Maybe I'm a little paranoid about this most highly stressed, extremely important structural area, but I personally would not trust the Hysol to protect against scratches. A scratch caused by sliding on the bracket is transverse to the spar, the worst possible direction for a stress riser on the spar. My brackets were also too tight to get on without danger of scratches, so I put them in a vise (padded jaws) and spread them just a little until they slipped on nicely. Very easy to do.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  5. #55
    Senior Member efwd's Avatar
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    Default Re: Spar attach fittings, flox or microballons?

    That is what I did as well.
    Eddie

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