| I'm following this thread with great interest as I've exactly the same problem on my Krick U25 (see avatar). The sub has only a single ESC but twin motors and it works perfectly on the bench but 'pulses' on the water - and it seems to be getting worse. My suspicion is that there may be a bent shaft that causes binding under load - or am I clutching at straws. I seem to have tried most of the other remedies unsuccesfully.
Andrew |