I have built a drone with these characteristics:
Frame Tarox XS690
Pixhawk 2.1 Cube with Arducopter 3.5
4 x ESC T-Motor Air 40A
4 x Motor T-Motor MN4012 KV480
4 x Propeller T-Motor P16x5.4
Battery Tattu TA-15C-12000-4S1P (12000 mAh)
The motors turn in the right direction and every propeller is properly installed. After the mounting and calibration process (radio, accelerometers, compass, ESC, etc.), I tested the drone, but it tilted to the left at take-off moment.
It could fly, but I had to move the roll stick slightly to the right to level the drone, although it also is slightly forward tilted, so it moves forward once it is in the air.
I tried exchange the similar propellers between them (CW with CW and CCW with CCW) but it still tilts to the left, so I guess there is no problem with the propellers. I exchanged front ESC: left to right and vice versa and again the drone still tilts to the left, so I guess there is no problem either with the ESC.
Finally, I exchanged frontal motors and this time the drone tilts to the right. So I guess, there is problem with one motor. This motor rotates, but it probably does not rotate at the right velocity. Is there an objective way to verify this? I am a newbie and I don’t still master the log assessment.
It can be seen that the “failing” motor starts rotating slightly later than the others. I even tried calibrate ESC once at a time and all at a time, but no matter what ESC I use or no matter in what arm the motor stays, it start its rotation most of the time a bit later than the others.
Have you any further thoughts about this problem? I would appreciate it very much.