Hey Everyone,
I just had a quick question about new Electric engines. I have the Yak 3D 55 Park Flyer. I must have burned the ESC or the Motor out on my last flight, so I bought another motor and ESC. I hooked everything up after breaking in my motor. I noticed that large arcs were coming out of the back of the motor. I think the max temperature reached by the motor was 160 degrees F. Is that okay. And is it normal for the motor to be spitting sparks out the back. I electrical taped around the sides just so the sparks would stay contained. Thanks for the Info.
Cory

No... that is not normal. That must be a brushed motor, and by the sounds of it, it's fried.

Remove the motor from the plane it is probably under sized.

Don't tape the ventelation slots, you have just made the motor into a tiny convection oven.

An amp meter/watt meter is not just nice to have, I feel it's absolutely essential for someone who flies electrics. The amps that the motor draws from the battery will tell you if the motor is overloaded. Using a prop that is too large will overload your motor. Substituting a motor with a higher Kv rating can also result in an overload if you don't switch to a smaller prop or use fewer cells.
Abused electric motors die fast.
Unabused electric motors will last almost forever, especially the ball bearing brushless motors.

Cory:
what batt. are you using.? Also to big a prop can draw a lot of current and overheat the ESC and/ or motor. Tell us more, what motor,esc,prop are you using.?