well the only probs i had were the short bolt that holds the pitch arm to blade grip strips very easy had to replace blade grip after 3 flights..the other issue is the amound of possable adj. the motor has. it took me a bit to get it right and i knew when it wasnt! the thing shook like a wet dog! but flew the hell out of it sat and sun this week end and had a ball..i did end up takeing my st-2 rpm up to 2050 from 1950
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