could be batt going, and if you got the money, i'd suggest getting brushless motor, with the stock motor and the CNC head, i doubt you'll have much power in the first place. i don't have the CNC head, got cf blades and 1050 lipo. i'm not flying inverted yet, learning while doing near stationary rolls (see the other post "inverted with a blade cp". you sure are good. how long did you have this heli? did you learn to go inverted with the blade? oh right, if you do go with a brushless system, i'd suggest getting the dd tail and a hh gyro... i don't have any of these. but will like to, if only i've got the money...