Setting up an RMRC Anaconda; this is my first V tail (inverted). It was a pretty bad “maiden” but one of the issues I was constantly fighting was the tendency to pitch down in FBWA (and, it seemed like stabilize too, but that may have been me mis-remembering).
Looking at my setup, it seems like that is due to nav_roll being off by -2* or so all the time, including when the sticks are centered. I did another RC calibration just in case, and I have the same issue. RC trims look fine - even when the PWM value is EXACTLY the same as the trim setpoint, nav_pitch still shows -2 or so. Any ideas?
I seem to have the same issue running arduplane 3.1.1. Im currently running a flying wing and with rc_input near neutral my nav_pitch is stuck at -2 in FBW mode.
Hi dmurray14 I believe your are seeing no throttle fbwa pitch, wich is affected by STAB_PITCH_DOWN, as explained by tridge:
– added new STAB_PITCH_DOWN parameter to improve low throttle behaviour in FBWA mode, making a stall less likely in FBWA mode (thanks to Jack Pittar for the idea).
If that’s the case, the tuning guide is a bit confusing - it specifically says to check the nav_pitch value to see if the issue is with the RC trim or otherwise.
[quote=“hernborc”]Hi dmurray14 I believe your are seeing no throttle fbwa pitch, wich is affected by STAB_PITCH_DOWN, as explained by tridge:
– added new STAB_PITCH_DOWN parameter to improve low throttle behaviour in FBWA mode, making a stall less likely in FBWA mode (thanks to Jack Pittar for the idea).
If that’s the case, the tuning guide is a bit confusing - it specifically says to check the nav_pitch value to see if the issue is with the RC trim or otherwise.
[quote=“hernborc”]Hi dmurray14 I believe your are seeing no throttle fbwa pitch, wich is affected by STAB_PITCH_DOWN, as explained by tridge:
– added new STAB_PITCH_DOWN parameter to improve low throttle behaviour in FBWA mode, making a stall less likely in FBWA mode (thanks to Jack Pittar for the idea).