yes, it happened to me 3 weeks ago. i had been flying mine for about 4 months w/ a os 91fx and jett muffler. had a lot of engine problems so i took the 91 out and installed a os 120ax. wow! what a difference. a lot more speed. during the 5th flight w/ the 120, she went in. it looked like a explosion. there was nothing left of the right wing. and i mean nothing. do not know what happened for sure, but we think the wing folded at full speed. i put together a new one with upgraded hardware and epoxed everything i could. need to remember the recommended engines for this plane is a 61 2 , or a 90 4 stroke.