RE: cuttin a hole in a foam wing
thanks, that helps alot. I asked a few questions at the field, and i was told that 6" is all i need. the club "guru" has experimented with lots of different lengths, and he said for a 40cc plane 6" is all that is needed. he tried 5" and had one fail. This plane is a 78" span with a 25cc engine, so it should be lots. I dont expect the final weight to be much over 12 lbs, so it should be alright. Now, i just have to find an aluminum tube, and also find a cardboard tube to glue into the wing.
thanks again for the advice