Make sure you're starting with trims and sub trims (if you have them) on your TX all centred. Next use the trim on the TX to stop the rotation. It should lock in one place. Also ensure that any revo mixing is off.


HH mode relies on both the TX and gyro agreeing on what "centre" is, normally a 1.51ms pulse width. If this is marginally off, in either TX or gyro, then the gyro will interpret it as a command to turn.

Adjusting the servo position on the boom will make no difference to HH mode, it'll only make the servo run offset from it's centre position.

Karyn