Yesterday, when I was flying my ducted fan at an outdoor airfield, I had a crash. After restarting, I found that one of the motors was not running smoothly and had a noticeable resistance and foreign object feeling when turned by hand.

Therefore, today, I removed the motor and disassembled it to inspect the specific damage.

First, I had to remove the retaining ring at the bottom of the motor. I encountered many difficulties during disassembly and had to seek advice from experts in the group. I used a flathead screwdriver to push the retaining ring outward, and then, when there was a gap between the ring and the shaft, I used a sharp tool to remove the retaining ring.

Then I removed the yellow gasket at the bottom.

Next, I had to separate the outer rotor and the stator coil. I tried pulling them apart forcefully, but failed. Then I tried using a screwdriver to push the shaft, but it also failed. Finally, I used a screwdriver as a lever to pry open the outer rotor.

Then I removed the bearing from the stator coil.

The bearing components consist of two retaining rings, two washers, a crown-like component with a groove in the middle to hold the steel balls, and the steel balls fixed on the groove of the short axis. After disassembling the bearing, I found that the steel balls were damaged, causing the resistance during rotation. The damaged steel balls had no reflection.

That's the process of disassembling the motor.

Finally, I measured the stator coil, which had a diameter of 15mm and a height of 7mm. Therefore, the motor model is written as F1507.

I wish you all good luck and hope you won't crash your aircraft again!