Lu,
I am intrigued by your answer to my last post. Presumably we are merely using the same language in a different way?
How can a change in airflow over a rotor blade cause a gyroscopic force? In my understanding airflow over an aerofoil causes lift and drag, not gyroscopic forces.
I certainly agree that there are very large gyroscopic forces involved in a typical rotor system but occurring as a result of masses being rotated at speed and not as a result of blade pitch angle changes. Various (enormous!)figures have already been quoted.
My understanding (as a pilot with 22 years of rotary experience and much of that spent instructing) and that of the conventional British way of teaching is that the rotor disc is "steered" not "precessed" by using aerodynamic forces to overcome gyroscopic forces already acting. Aerodynamic and gyroscopic forces come to a compromise and what is left over gets fed back into the rotor head. If the resultant feedback of the two is too great for the pilot to handle then it is usual to design a hydraulic system to help him out.
My logic tells me that the relatively spindly pitch-change rods on a typical rotor head would be totally inadequate to apply sufficient precessional forces at an acceptable rate for purely gyroscopic control of a rotor disc, as would the pilot's own physical strength or the small hydraulic pump as typically used.
Maybe I am missing your drift due to us being from two different nations separated by a common language!