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What's happening?


WWII fanatic
well I'm having some issues with my motor is a rs2205s with a hitech 40 amp esc on a 4s battery, what happens is after about half throttle the motor starts vibrating and doesn't sound like it spins any faster.
but it doesn't happen on 3s.

do you know what's happening?


Eternal Student
I would be willing to bet that if you put a prop on it would behave properly. ESC's have a max RPM they can handle, and with no load and a higher kv motor you probably reach that around half throttle. Not sure what the spec is on your ESC, but it's made for planes, and larger ESC's like that usually also use low kv motors and big props.