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Merely reduces strength by 30%!
Would need to do another load test on the wing to confirm the effect.
Duncan McF
----- Original Message -----
From: "Fred Fillinger" <n3eu@comcast.net>
Sent: Sunday, January 15, 2006 6:16 PM
Subject: Re: Europa-List: Wing skin separation HELP
>
> My attempt to soften Redux, after it had cured a couple weeks, was too a
> failure. Too much heat required, verses heat to damage the glass
> structure, which conducts heat poorly to get at the green stuff. For my
> safety at least, I would be assuming this procedure might give me a
> potential airworthiness problem to forever worry me in severe
> turbulence.
>
> I'm surprised the factory would advise -- not knowing any builder's
> skill level -- removal by any method other than panel destruction and
> replacement (requiring essentially $$, that's all!). Otherwise a
> Hobson's choice on structural integrity, attempting a fix, the moral
> equivalent of "don't force it...use a bigger hammer."
>
> I don't have this style wing, but merely perused the XS manual online.
> It's my opinion that the primary purpose of the tapes is such that
> improper orientation of the fibers matters only a little, but I have no
> credentials to say that. But, when we add two more tapes, we do stiffen
> the ass'y there further, concentrating stresses elsewhere. That could
> mean a "seven yard gain, with a five yard penalty," as in U.S. football.
> So, if the factory can analyze that one with engineering analysis to say
> no harm, they should be able to say computationally why -- in stress
> paths -- 90 on the tapes is not good. Or more likely just their gut
> reaction and "usual rules" for FG construction.
>
> The only thing I would not do was a fix which may compromise the
> structure worse than the original problem.
>
> Reg,
> Fred F. (nickname "Hobson")
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