I have 2 3800mah battery, 3S with 30C power.
Motors are 450w and 930KV
Everything is set properly.
ESC calibrated using auto mode (calibrated all ESCs at one time)
Motors are same
ArduPilotMega 1.4 with 2560 processor
IMU Shield attached also.
Body (frame) of quad is fixed and checked multiple times, gyro shows good.
Anytime I start engines using my RC (Futaba 6EX), it starts spinning/rotating around itself and sometimes it takes off over two legs and rotates over two legs.
Seems like two motors spins faster than 2 other motors, sometimes 3 motors faster than other 1.
I tried Takeoff mode, auto mode, stabilize mode and guided mode. None made change!
CW and CCW propeller and motor spin side checked multiple times. No worries.
When I push throttle just two legs goes up and arducopter rotates.
I had 4-5 takeoffs but suddenly it crashed to something, because it was always going to one side, like I push it to move left, it was always going to left after takeoff.
What do you suggest? What I'm doing wrong? Any suggestion? Please help me.