I calibrated my "Ready-to-Fly" RTF x8, and took it out side WITHOUT propellers on. I was trying to see if I could get a GPS lock and to see if the throttle was working correctly. I noticed when I armed it that only 3 of the motors were spinning. I increased the throttle a little bit and all 4 started spinning. A Few seconds later the motor that was lagging started smoking, but it looked like it came from the wires. It may be the capacitor or something else. I disarmed the UAV and immediately removed power.
Does anyone know what the problem is?