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Foam wing repair

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Old 12-05-2016, 08:44 PM
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Jetset
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Default Foam wing repair

Need some advice on a repair. It's a sheeted foam wing that has been glassed. It had a bit of a hard landing and cracked the top skin. Looks like the gear plate twisted a bit plus it was forced up as well.
I have a rough idea what I think I should but would like an expert's opinion here as well
Retract is no biggie as I have another one.
What would you do?
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Last edited by Jetset; 12-06-2016 at 12:45 PM. Reason: typo
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Old 12-06-2016, 09:02 AM
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mikes68charger
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Me, I would cut the top balsa skin off in a huge rectangle, around the crack, at least 3in on each side of the crack, cut it out with a cut off wheel, not very deep just the balsa. Once off, put epoxy in the crack and make sure the wing is installed in the jet when you do this, so there in no chance of changing thing shape.

once cured, take a small block with 36 grit sand paper, and sand the foam down about 1-2mm, then put down 1 to 2 layers of 6oz glass cloth (stuff from Lowes), make it level to the rest of the foam, while still wet (the glass needs to be wet with finishing epoxy, a box or Z poxy) then replace the balsa top skin with new balsa, make it as tight as possible, then take your drill, with a sanding/grinding disk 2in grind some of the glass off about 1/2in past were you cut the balsa out (do this before fiberglass), then once you put the balsa down, (it will be glued down with the finish epozy) Then top the balsa with 1/2 oz cloth with the z poxy, if you do all the prep work you should beable to do the all the fiberglass work within 10min.

The retract area, that sucks, either epoxy back the foam, and add a carbon fiber rod from broken part to the good part of the wing.
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