I built a new plane recently, it has about 5 hours trouble-free flight time so far. Today when I switched from FBWA into loiter mode, the DesRoll value showed it wanted to roll hard left a few times over the next 20 seconds or so. Each time was very brief (about 1/4 of a second) and the set point was the maximum bank angle allowed (45 degrees). After that there were no further disturbances and the flight continued as normal. Has anyone experienced this?
Plane 4.6.3 (3FC7011A)
Omnibus F4 pro
btw I noticed with some recent versions of Arduplane that right after launching there are often a series of small pitch wobbles, about 1 second apart, they usually fade out quite quickly and never return. I assume this is some kind of automatic pitch response tweaking? Typically only the first wobble is visible, by the second one it has already decreased to a level that is not noticeable. But in todays flight these wobbles persisted longer than usual, I can clearly make out 7 wobbles and some of the latter ones are actually larger than the earlier ones:
I see nothing wrong in the log except the actual spikes in loiter, the spike after landing looks to be commanded by stick movement.
I think I recall seeing some twitches in loiter but since they matched turn direction I assumed it was caused by heading controller setting target not frequently enough and didn’t investigate, but I see no indication of such issues in the log.
ah yes, I think I did wiggle the elevons myself after landing, sorry for the misdirection.
In my case all the twitches occurred in the phase where the plane is still heading outward from the loiter center, which should be pretty much a straight line. It’s a 300m radius and slow plane so this phase takes a while.
I have done some poking about at this and have been able to reproduce in the sim. Its certainly a bug, I’m not yet sure the best way to fix, but we will figure it out.
From my testing this can be made worse by turning in the final loiter direction with stick mixing.
