Originally Posted by Widelec
I have got Same Radio, ESC with YS-X4 and same problem for ESC calibration.
My Radio Throtlle channel reversed.
ESC's not initialize same time. One motor spinning first and then others.
If I start off and apply a gentle throttle, mine does the same. Generally it is motor 4 that lags. Just put it in GPS mode and take the throttle up to 50% and higher and take off. And when landing motor 4 stops 1st. But the system flies extremely well. Both the YS-X6 and the YS-X4.
Maybe it is because motor 4 seems to be always on the high side as I never take off from a level platform.