Yaw Dampener Oscillation

[fausete]

Hi again, we've not observed this behaviour in our internal version. In any case, the best way to test this is if you can provide a trk of the situation.

[Kobal]

Rudder and pedals oscillations during take-off. Crosswind 8 kts.

yaw oscillations.trk

Edited May 19, 2023 by Kobal

[Kobal]

 

You can see the phenomenum at the begining, roll induced (rocking wings)by rudder oscillations at rotation during take-off.

Edited May 19, 2023 by Kobal

[fausete]

Hello,

We've been investigating and we are pretty sure now that the issue is caused by turbulence. You can set turbulence level in the mission editor but some phenomena, such as crosswind and wake now have turbulence included even when the turbulence level is set to 0 in the ME. Some other modules also seem to experience this, although at a lower strength. We are working to provide a fix in the next OB update.

[fausete]

We've adjusted the yaw damper and now only the most extreme levels of turbulence (selected in ME) generate some jittering in it.

[Kobal]

Ok, gracias !

[Kobal]

Hi, problem is always here during take-off rotation. You can see the rudder pedals oscillations (with induced roll) on track.

 

Oscillations.trk

Edited June 9, 2023 by Kobal

[fausete]

Hi, @Kobal,

The problem you describe with the pedal movement has to do with the antislip and is completely unrelated with what this thread originally described, which had to do with the yaw damper frequency behaviour.

What you describe is due to the aircraft temporarily not detecting weight on wheels, and thus activating the antislip during the take-off roll. I've just fixed it so you'll have it available in the next OB release. And obviously, immediately after take off, the aircraft will naturally tend to align itself with the wind (and the antislip will help), so you'll still notice it reacting to the wind and you'll see the pedals moving once the wheels leave the runway.