The wings broke on my trainer. It nosed dived from WAAAAAY up in the air. It sounded like a canon when it hit the ground. It knocked the carb off, crack the exhaust mount and ripped off the high speed needs, not to mention it turned the spinner into tiny pieces.

I didn't think it would ever work agan. I built a new plane. I took the engine apart and sprayed it out with parts cleaner. Put two gaskets on the exhaust and it seems to run great! I havn't flown it yet. But I am surprised as heck an engine can withstand that kind of punishment and still work.