I just finished building my first multi-rotor and noticed something strange with one of the motors. When I spin down, one motor will stop much sooner than the others. The motor is also a little harder to turn by hand when under no load, no battery connected. Could this be due to a short or bad bearings? The hex a has not been crashed, so I can't see the motor shaft being bent or anything like that.
Any input from the community would be great! I'm running the 880kV motors with 11x4.7 props from 3DR.
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After some troubleshooting, it looks like I've discovered the problem. The cir-clip on bottom of the motor seems to be causing the issue. When removed, the motor spins freely and does not bind. When replaced, the motor goes back to binding. I'm just assuming I need to loosen the set screw on the shaft to relieve some of the pressure caused by the cir-clip, then re-tighten the screw. Does this sound like a correct assumption?