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Wind Root Fairings - Nutplates

 
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bcross2160(at)rogers.com
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PostPosted: Sat Apr 28, 2007 7:07 pm    Post subject: Wind Root Fairings - Nutplates Reply with quote

Hi Folks

I was working on my wing root gap fairings on my 8 today. Where the
fairing is screwed onto the top & bottom wing skin, the plans on Dwg.
43 call for a K1000-08 nutplate & to machine countersink the
skins. In the wing tank area where the gap seals are attached to the
tank skins, the plans call for K11000-08 nut plates. This would of
course call for dimpling the skins to accept the AN509-8R8 screws, (
the same screw called out for the K1000-08 nutplates).

This does not seem right to me as the countersink depth from the top
of the screw to the end of the taper on the screw is about
0.080". This means that if you machine countersink the skins which
total about 0.050" in thickness, the holes are going to be huge all
the way through both skins, ( the holes will largest of course at the
outer skins & the inner skin will have a smaller but still a significant size).

It seems to me that all of these areas should be dimpled due to the
thinness of the total material. The documentation indicates for the
tank area, the skins be dimpled first & then if required, machine
countersink to complete it if the necessary dimple depth cannot be attained.

To add further confusion, I looked at my preview plans with the last
update of July 1998, all of these areas were specified to have
K1100-08 nutplates which as mentioned, to me that makes total sense.

I am obviously missing something here & would really appreciate any
help on this. Maybe I am being too fussy but I don't want to mess up
my wing skins at this stage of the game.

Thanks so much.

Brian Cross #81844 RV-8


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