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Wing repair question

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RCM&E18/01/2007 11:53:00
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(Reposted from the 'Helloooo' thread in the Beginners folder - question originally asked by Michael Lydon)

Hi,

I was finishing my new 40 size trainer and managed to punch a hole in the top of the wing. What do I repair it with?
David Ashby - Moderator18/01/2007 20:04:00
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Michael, is this an open structure ?
If so, and assuming this is just a covering problem then a patch made from solartrim (sticky backed solarfilm) should suffice.

David.
Andy Green21/01/2007 22:20:00
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I use Magic Tape for on the field repairs, Use the branded name, and it goes nearly invisible. It can also be used for (gap free) hinges on smaller models.
Stephen Grigg27/12/2009 14:16:01
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Ive a model with foamy wings covered in ply.The ply is cracked quite nearly the width of the wing.Any ideas of the best way to repair what appears to be a cosmetic failure as to structualn ?
Pete B - Moderator27/12/2009 14:58:10
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If there is no spar in the foam then you have, effectively, a monocoque construction with little strength in the wing, Stephen. Depending upon where the crack is along the span, I'd cut and insert a couple of full-depth 1/16th ply braces across the crack, well-glued in - and making sure some glue fills any break in the foam. The nearer the fuselage, the stronger this joint will have to be to cope with the wing-loading.
 
Pete
Stephen Grigg27/12/2009 15:01:57
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Thanks for the help Pete B.Ill have a go when I get home
Stephen Grigg27/12/2009 17:00:19
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Your suggestion seems to have gone well Pete B Thanks for the tip
Eric Bray27/12/2009 17:06:58
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Stephen, When you say nearly the length, do you mean from front to back (chord), or side to side (span)? If it is side to side, it is a fair bet that the adhesive bonding the veneer to the foam is dying of old age, and as the veneer dries it splits and curls up.
If it is from front to back, and near the body (fuselage) it is probably going to break there next time you try to fly it.
You can 'bodge' it as suggested by Pete B, but a new wing would be safer.
It has possibly been cracked there by a crash-landing,  the resultant damage will have destroyed the foam integrity beneath the crease, as well as the veneer, and very little upward pressure (ie airflow!) will cause the wing to fold up.
Stephen Grigg27/12/2009 17:12:20
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Thanks Eric.Its at the top of th wing front to back.The underside is excellant.The wing feels sturdy enough,and initially I was looking at it cosmetically,but have now dug deeper to do a proper job
Stephen Grigg27/12/2009 19:44:40
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I tested the wing after repairing it at with the warning Eric gave me above found the wing snapped in half  Although the wing didnt look to bad you were absolutely right Eric thankyou
Stephen Grigg27/12/2009 19:45:40
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PS. Been to busy modelling to watch the tele Eric

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