ORIGINAL: shag555
Keep your eye on the motor mount (aluminum pieces). I broke both sides by doing aerobatics. They stress cracked and eventually failed right at the point where it bolts to the engine. Both failed at different times. I replaced them with mounts ones that I made myself.
Funny you should mention that. I thought it might be because of how I drilled mine, but I just broke my SECOND set on this plane. What the heck, a little nose weight won't hurt, the third set will be cut from steel. What kind of power are you using? I have .56 Saito in mine.