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Roll oscillations, Pixhawk, Twinstar

@docromano wrote:

I'm having this issue in plane 3.6, .7 and .8 beta and I suppose it´s not version-related so I post it here:

I have an issue with my Twinstar platform. Generally it is super reliable and stable. Recently I tried a few flights in stronger winds (~20-30 km/h) and experienced roll oscillations sporadically. Sometimes they stopped without intervention, sometimes I ewnt to manual for safety reasons.

Roll/DesRoll and PIDS

Image may be NSFW.
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Short SlowMo video of the issue:

I asked this at various places and got any number of suggestions. I already tried increasing D (no change) a little and reducing P to half the value (sluggish behavior but no more oscillations). The latest suggestion was to kill D because planes in general wouldnt need D at all, just P and a little I. I am looking for more input.

I am especially interested in how planes react to PID settins. There´s a lot of info when it comes to copters - too much P - this happens. Too low D - this happens. Couldnt find that for planes. Any ideas on that besides my little Twinstar problem ?

Oh and I have to say...if winds are not that bad, in the <15km/h range, it flies just great !

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