Regarding yaw, I found something quite by accident that I need to replicate. I was testing things for someone else, and had spawned the Arrow at Out Skerries. I had noticed that there were 45kt winds so thought why the hell not, and it was time for some helicopter action!
When I spawned on the runway I found the wind was enough to push me along, even with the parking brake set, depending on how much throttle I used.
Getting to the point, when I applied enough power to actually get push along, I noticed that I had that yaw effect kick in even though I was only moving at perhaps walking speed. I was weathervaning in the direction of the wind, but it seemed more keyed to my prop speed than my ground speed, if you see what I mean.
It was that same near uncontrollable lurch I’ve seen so many times before, but now seen at walking pace.