Ya know, Wash, some of the yaw we experienced in that little jet ( A-37) might well have been gyroscopic precession. However, most of us concluded that it was the awesome increase in thrust from the original design ( hmmmm, thinking of a certain two motor jet with increased power and a different placement WRT the original airframe, but worst effect was in pitch, not yaw or roll).
For those not familiar, the original model had two engines that put out a little less than 1,000 ld thrust. The attack model engine put out 2800 lb !!! Yikes. So just one engine gave us 50% more power than both of the trainer engines. It's why we cruised on one engine a lot.
I am fascinated by the diverse contributions/opinions on the whole thing I see on this thread.