After about twenty flights, I noticed that the right-rear motor started to have about 1/8 inch of free play when pulling on the prop and during motor shutdown, this motor would stop noticeably sooner than the other three. This was the right-rear motor. I had read some stories about the Upair One falling out of the sky now and then and was worried about this motor losing a prop.
I disassembled the quad and then disassembled this motor and found that the set screw mounting the shaft to the rotor was loose and the shaft was working loose or the screw was tightened against the round part of the shaft instead of the flat point that is designed to hold it in place. After inspection, this motor appeared to be ok, so I swapped the brass washers at the base of the motor. (The one with the small gouges in it) so it had a smooth surface to contact the bearing on the bottom of the stator. The motor rotates as freely as the other three motors so I reinstalled it and reassembled the quad.
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| UpAir One V4 motor disassembled. |
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