Noisy thing on and off

Joined
Jun 21, 2016
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got a new P4 and on and off I hear this high pitch which sounds like it is a motor. not sure if it is a bad motor or not. It's on and off.
 
Whistling is normal.

The only moving/wearing parts in the motor are the bearings.

The best way to evaluate motors is post-flight.

Feel them for temp.
If all are similar you're good.
 
It's normal sound for the P4.


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