As DavidAgar said, pick up ALL of the pieces from a crash. If the crash was really bad put them in a bag when you get home, and then put it away for a week or so. Human nature, you're going to be really bummed out after a crash and you're first thoughts may be to just throw in the trash. At first it may not look repairable. But wait a week or so and then look at it again, you'll be totally shocked at just how easy the repairs actually are. The guys that get totally PO'ed and throw the plane in the trash barrel at the field are great. I'll fish the plane out and take it home to repair. So far I've gotten 5 airplanes like that!!!

Another great friend of the repairer are popsicle sticks..... uh, I mean craft stick!!!! You can find them at in the craft section at Wal-mart. You can usually get them by the 100/500/1000 pack. They are great for reinforcing after you put the parts back together.

Another great material for repair, fiberglass. When you're at the LHS pick up some lightweight fiberglass cloth.

Hope this helps

Ken