I am doing a rainbow too low and the blades hit the ground. Fortunately, I am just in time to recover it before letting the heli eating the dirt, and I auto and land it safely. The heli remains intact including the blades, and the only damage is just the stripped main gear.
Today I fly again, but the motor gives me a problem. As soon as I apply throttle, the motor power is cutting out in an on and off fashion like a sine wave. I think I may have a slippery pinion, but it is not the case.
So, what could be the problem then? Do I wreck the motor or the esc? Any suggestion how to diagnose this problem?