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Thread: Trimming NACA duct aft edge

  1. #11
    Senior Member jiott's Avatar
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    Default Re: Trimming NACA duct aft edge

    Floog, so you bubbled the paint on the UPPER cowl? I didn't think the exhaust headers were up that high. Or did you mean the upper part of the LOWER cowl?
    I ran my engine several times on the ground at WOT to check static rpm after fussing with prop pitch (ground adj.) at around 5200-5300, but did not keep it at this hi speed for very long. That's probably why I got no paint blisters.

    Did you have to repaint the cowl, or just a small patch?
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  2. #12
    Senior Member jiott's Avatar
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    Default Re: Trimming NACA duct aft edge

    Another question Floog: I thought prop balance runs had to be with cowl off so you could mount the equipment-sensors etc.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  3. #13
    Senior Member
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    Desert Aire (Mattawa), WA
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    Default Re: Trimming NACA duct aft edge

    My bad, Jim. You are right: it bubbled on the UPPER part of the LOWER COWL. Only the upper cowl had to be removed for the prop balance. I sanded it out, touched up with a little Aerothane, and then wet sanded/polished. You can't see it anymore. Good catch, Jim!! Thanks.

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