Lu,
One of the biggest problems I have with the concept of the rotor as a gyro is that effects such as pitch variations when rolling into a turn simply do not seem to happen. I know Ray Prouty has included work on this in his excellent books but I have demonstrated effects of controls too many times to mention on Gazelle, Wessex and Lynx and never have I observed a tendency to pitch nose up or down in any of them. Having taught many student QHIs at CFS there could be no question of cheating or fudging the demos by masking these effects so I am convinced that therefore the gyro concept is fatally flawed.