Hello,

I would like to bring forth my skepticism of yaw instability being linked to high-alpha wing rock. Take UCD for example. It has excellent yaw stability, but will start rolling back and forth while attempting high alpha vectored flight.

Another example, Goldberg Extreme 330 profile has also great yaw stability, but has considerable wing rock during harrier. But its brother Extreme 540, with a different wing, is much more stable during harrier. I'd say these 2 planes have similar yaw stability. I owned both.