Motor Burned out?

ArduCopter Copter 3.3
1

After a crash the other day i started investigating why. I found that on the motor test one of the motors was not spinning properly. Where the other 3 would spin freely the 4th motor had trouble revolving and seemed to stagger (not spinning smoothly at all in fact only did maybe 2 or 3 full rotations in a 2 second period)

Is this a motor burn out or something else… I checked a differnt ESC and the ESC is not the problem

thanks

2

darkdrgn2k,
It certainly sounds like the motor is the problem. Nicely done tracking it down with the MP’s motor test!

3

Looks like one of your motor phases is burned out or shorted out. You should be able to confirm by checking resistance across the motor leads. Just test A-B, A-C, and B-C and one of them will probably be either open, or low resistance.