Can't get Autopilot setting adjustment for proper handling qualities
Posted: Tue Sep 20, 2022 4:19 pm
Hi. After Pitch and Roll Servo installation, I have a hard time adjusting the parameters to have good flight characteristics without oscillations or overshoot. In Roll, it goes pretty good with small oscillations however and those roll oscillations are similar to a dutch roll movement. Right now, when AP falls into Altitude hold upon reaching target altitude, the aircraft continues to climb and MFD ask for more trim up. I am confused and do not understand that situation. Could it be that Pitch servo gain is not high enough?
I started by setting gains and damping at 100% for roll servo and pitch servo. For now, best settings I have found was a gain of 89% and damping of 119% or so (not sure exact numbers from my memory).
-To perform Pitch and Roll Servo response test, should we place the damping setting at 0 first and increase them by step until getting no oscillations?
gain at 100%, damping at 0. Perform response test until getting slight oscillation and then increase damping to resolve them?
I find the procedure in the A/P install manual not so clear so this is why I am asking advice here.
Thanks for your help,
Louis
Pelican 914 on Amphib Floats
Horizon 10.1 SW 2.00 and Sport EX 7 with SW 4
EIS 4000 with dual FF red cube
I started by setting gains and damping at 100% for roll servo and pitch servo. For now, best settings I have found was a gain of 89% and damping of 119% or so (not sure exact numbers from my memory).
-To perform Pitch and Roll Servo response test, should we place the damping setting at 0 first and increase them by step until getting no oscillations?
gain at 100%, damping at 0. Perform response test until getting slight oscillation and then increase damping to resolve them?
I find the procedure in the A/P install manual not so clear so this is why I am asking advice here.
Thanks for your help,
Louis
Pelican 914 on Amphib Floats
Horizon 10.1 SW 2.00 and Sport EX 7 with SW 4
EIS 4000 with dual FF red cube