I think I might have an answer to this oddity. I kept an eye on the (animated) rudder pedals in some GA aircraft. Every now and then they wiggled from side to side, as though my actual yaw controller was vibrating all by itself. After re-calibrating it didn't make much difference. It still occasionally went wild. I'm going to reset the controller in MSFS each time I fly and see what happens.

So it is probably not turbulence at all but either something wrong with my rudders/stick yaw controllers, or somehow MSFS is commanding controller wriggles occasionally. If you get what appears to be sudden turbulence even when it is set low, check your rudder pedals in the sim to make sure they are not moving or vibrating by themselves.

4 hours ago, robert young said:

I think I might have an answer to this oddity. I kept an eye on the (animated) rudder pedals in some GA aircraft. Every now and then they wiggled from side to side, as though my actual yaw controller was vibrating all by itself. After re-calibrating it didn't make much difference. It still occasionally went wild. I'm going to reset the controller in MSFS each time I fly and see what happens.

So it is probably not turbulence at all but either something wrong with my rudders/stick yaw controllers, or somehow MSFS is commanding controller wriggles occasionally. If you get what appears to be sudden turbulence even when it is set low, check your rudder pedals in the sim to make sure they are not moving or vibrating by themselves.

Exactly - you have written much better than what I wrote earlier - the rudder keeps "Twitching" - and needs calibrating 

or dumping  --- which is what might solve my problems

1 hour ago, jaytee73 said:

Exactly - you have written much better than what I wrote earlier - the rudder keeps "Twitching" - and needs calibrating 

or dumping  --- which is what might solve my problems

Try adding a deadzone if its not deviated too much.