I have a scratch built Hexacopter (Hobby King) with NAZA V2 Light Control Board and Futaba Tx/Rx. I am running 6 x NTM 28-26a 1000kv motors and Proflight-UK 30A Simon K ESCs. I am running 3 cell Lipos. (Not powerful enough, I know, waiting for order to arrive)
As soon as I take off, the model drifts to the left for about 10mts and then settles down. I have extended the post holding the GPS to 13cm to ensure there is no interference from the electronics within the body. I have also waited some 2/3 minutes to ensure the NAZA had warmed up. Although I can reduce the drift with trim, as soon as I change batteries, the drift returns even with the trim set for the previous battery.
I have calibrated the ESC/Motors and this does throw up an anomaly. I can calibrate motors 1 to 4 without any problem but motors 5 and 6 start up when the throttle is moved from high to low during the calibration as though they are reversed. Once the hex is set up ready for flight, motors 5 and 6 react the same as the other 4.