tonyrenshaw268(at)gmail.c
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 Posted: Sun Oct 27, 2013 11:38 pm Post subject: Wing to Fuse Fairings……..Alternative Methods….maybe |
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Gidday,
I'm after advice regarding the wing to fuse fairings, whether an alternative method was attempted by anyone else, as I'm a little bit motivated in that regard. I'm using Fred Kleins P51 trailing edge to fuse mouldings, and it suits that setup that I know where the extension of the wing meets the fuse, so, I've used thin foam glued ontop of the wing, shaped to the fuse as a "shelf" which I've built up on the closeout side, and then lay-up BID ontop to reinforce it. So, once the original foam on the top of the wing has been removed I now have the wing extended all the way to the fuse. I can now more accurately shape foam to the fuse, which especially on the underside requires the foam to be shaped to be well over 90 degrees, to mate with the face. If I wasn't working upside down I'd bog it up with car bog, and then shape it, which would create a perfect layup substrate. Still, I can't, but since I have the wing skin extended all the way to the fuse i am wondering if anyone has any suggestions. I hear that it is a good idea to make the fairings flexible, because under aerodynamic load they need to be able to flex.
My first question is, had anyone made rigid fairings, and do they pop against the fuse under G, or are there any negatives? My setup if I persist will result in a triangular cross section which won't flex easily, vs what the book wants, and also there is the issue of the number of plies i need to use. It didn't make sense to me to follow the book on the top, and bottom of the Leading edge where I have on average 10-15 mm max of gap, and with a 25 mm radius, it just didn't gel with me as the best way. Maybe I should clarify where the gap on the trailing edge is far more, so it seemed I needed to extend the wing anyway.
Any help with alternative suggestions would be appreciated. I know what the book says, but my question is more pertinent to those that might have chosen an alternative method.
Thanks.
regards
Tony Renshaw
Sydney Aussie.
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