My old Extra started to have problem which with earlier planes has solved by replacing the ESC but not now;
Original motor and ESC, 4S battery, original propeller: ESC started to lose motor out of sync, (that screamlng sound like stones in gearbox). It became more common and so I changed ESC to Roxxy BL control 755 S-bec. It worked OK for a while but problem is back: worst when testing motor in ground, but after giving more gas this "coughing sound" diasappears and starts to work and I can take-off. Plane in air (regardless if I add gas , also with steady motor gas stick position) it has started to do this more often now. Motor stops and comes back to operation after screaming a while.
-Can broken motor cause this ?
-Can both ESC's be broken ?
-why it worked a while without problems with new ESC but problems is existing now more often ?
- if there is issue with ESC timing, to which settings I should change it ?
Could somebody help with this ?