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Old 08-21-2016, 02:18 AM
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Voidhawk9 Voidhawk9 is offline
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Default F22 slight damage

Hi all,
Finished the front side layups on F22 this week, but unfortunately when removing the peel-ply it grabbed a single bundle of fibres on the top layer of UNI and pulled it up with it (I didn't trim until after cure).

To my newbie thinking, rather than do the 'standard repair' and have a lump here which appears could be a big pain when it comes to canard install, I could just replace the missing fibres into the groove, wet-out, peel-ply and squeegee flat through plastic.
The loss of strength here should be minimal if I'm understanding correctly, but I would like some feedback, given that this is a particularly important area!
TIA.
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Old 08-21-2016, 09:16 PM
Marc Zeitlin Marc Zeitlin is offline
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Default Re: F22 slight damage

Quote:
Originally Posted by Voidhawk9 View Post
Finished the front side layups on F22 this week, but unfortunately when removing the peel-ply it grabbed a single bundle of fibres on the top layer of UNI and pulled it up with it (I didn't trim until after cure).
The first question is, what direction is the UNI? It looks to be vertical.

The front side of F-22 gets two plies BID at 45 degrees and then one ply of UNI horizontally above the leg cutouts - it says this in a few places. And if you did the vertical UNI layups on the aft side too, where it also should have been horizontal, that'll need to be redone. So if I'm interpreting this correctly, you'll need to re-do F-22 since both sets of UNI plies are in the wrong direction. If I'm incorrect, let me know and we'll see what can be done.
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Old 08-21-2016, 09:21 PM
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Voidhawk9 Voidhawk9 is offline
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Default Re: F22 slight damage

This is the last of the alternating 9 BID/UNI plies on the sides of the forward face. The 2x BID and horizontal UNI above the cutouts are under these. Sorry I guess the photo is cropped and unclear.
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X-plane (Flight simulator) Flight Model Master - X-Aerodynamics

Last edited by Voidhawk9 : 08-21-2016 at 09:51 PM.
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Old 08-21-2016, 10:02 PM
Marc Zeitlin Marc Zeitlin is offline
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Default Re: F22 slight damage

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Originally Posted by Voidhawk9 View Post
This is the last of the alternating 9 BID/UNI plies on the sides of the forward face. The 2x BID and horizontal UNI above the cutouts are under these. Sorry I guess the photo is cropped and unclear.
Aha. OK, if it's the last of the zillion plies, then I'll agree with Kent's position. Fill the indentation with flox if it's underneath the lift tab area, sand and paint the vertical lifted groove with epoxy to seal the torn edges, and call it good.
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Old 08-21-2016, 10:07 PM
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Voidhawk9 Voidhawk9 is offline
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Default Re: F22 slight damage

Thanks Marc.
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