When armed I have got that strange scratchy sound when tried to start the motor. After some trying it could run smoothly for a while, but if the rpm get low or stop it will sick again...
During the scratchy operating the motor is getting hot and the ESC too...when its running on smooth the ESC and the motor are cool.
What could be the problem???
The rest 3 ESC + motor combo is working nicely, only this ESC + motor have this problem on my quad...
