Alright, i have a Goldberg Superchipmunk with a O.S. FS-91 engine, i had a hard landing (in a tree haha) and it took a chunk about 3 inches long and 2 inches tall right on the front airfoil part of the wing, i managed to find most of the wood but there was still a hole, so i tried something new, i got some expandable foam spray, some clear flexible pastic, and some wood filler, i covered the holes with the plastic foamed the inside of the holes, once it dried i sanded the foam so it was flush with the remaining wood and then put wood filler over it and sanded it till it was flush also, would this process throw off the balance or anything i have pics i dont think it did anything to it when it comes to weight except maybe an ounce on the right side of the wing. please help!!!!!!

Check your lateral balance now after the repair, if it drops a wing you might have to add a little weight to the opposite wing till it balances again laterally. Rc ken shows a good demo of how to do this in his PIF build thread of the Sig LT 40. If you don't allready know how to do it.

Where any of the structural components (ribs and spars) of the wing damaged? If anything other than just the wing sheeting was damaged then a repair of this sort more than likely won't stand up in flight. I wouldn't try using this method for repair of the wing. It needs to be properly repaired. RCU member Minnflyer has written an excellent how-to article on doing sheeting repair, check it out to see if it will help in your situation. You can find it here: [link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=98]Sheeting repair how to[/link]

Hope this helps

Ken

Sounds purdy scary to me ,I hope it works but the initial damage sounds as though it got into something more than just the sheeting Good Luck .

No it didnt get into any of the ribs or spars and i checked the balance of the wing after i had everything sanded and done and it was a little off so i just added two washers to the opposite side and now it is balanced great, its really sturdy, maybe more that the original!!!! thanks for the advice.

There is structural strength contributed by the leading edge spar. It's been 15+ years since I built my Chipmunk (It had just been released by Goldberg at the time) and I can't recall how the LE was done on this kit. Would it be possible to splice a piece of LE wood to the foam you've installed?

Seeing how you have asked this question here in beginners, everyone will assume you have no or little building skills, whether this is true or not. Maybe what you've done will suffice, only you and your local experieneced flying buddies can really make a decision about the structural integrity of this repair!