Hi everyone
I thought I'd bring this question into its own thread in the tuning section ...
My AQ-controlled X8 is flying quite well now that I have reduced the vibration being picked up by the AQ using vibration-damping grommets. Current vibration levels from my last flight here:
The problem is when activating the Position Hold mode the platform slowly sinks to the ground. The position hold bit works and can keep the platform in position even in a headwind ... but the altitude hold is non existent! Even if I've set the throttle correctly to maintain altitude in Manual mode, enabling Position Hold mode makes the platform sink slowly.
Curiously, the GPS_HEIGHT plot actually shows this slow descent – so the AQ knows the platform is sinking but it doesn't appear to be doing anything about it! You can see the three downward sloping lines here which coincide with me enabling Position Hold mode. After the last descent I decided it wasn't worth pursuing with the tests any further!
I tried adjusting the Navigation Altitude Position P and I values but they appeared to make no difference whatsoever. Do these only affect the Mission mode rather than just the Position Hold mode?
What parameters can I adjust to improve the altitude-hold performance?
Many thanks for your help!
David