APM Trex 450 clone, pitch setting changing in flight

@rfine7666 wrote:

Thanks in advance
APM 2.6, ver 3.2.1, Trex 450 clone, Tarot FB head, Flysky 9X, flying pretty well, still tuning. Mostly using flat throttle curve 0-30-75-75-75, pitch curve is also fairly flat, PID setting are fairly low.
Question (calm wind) when trying to hover or just normal level flight, it seems the pitch on the blades must be changing because heli is either gaining or losing altitude without moving the throttle stick? Sometimes the movement is quite substantial but sometimes just small amounts?
Is there a parameter in mission planner I could try to adjust that would help this problem?
Thanks

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