RE: Need tips for fixing a GP 40 Corsair
I have built this kit and also Corsiars by Royal and TF. This kit is very docile for a Corsair and the great flying qualities rely on the incidence and straitness of the wing. The wing is built out from the mainspar, so if this is warped, the wing is, IMO, junk.
I would see about either getting a wing kit or spar and rib set from GP and build a new wing.
Scott