Lu;
Thanks for the information on the Cheyenne rotor. The following web page, by Doug Marker, may also be of interest. It describes some of what you said and adds some of its own.
http://www.internetage.com.au/cartercopters/pics9.htm
A year ago, Doug started a thread on rec.aviation.rotorcraft, in which participants discussed gyroscopic precession. His intent was to display the conclusion after all the information was is.
He may have never been able to come to a conclusion
, whatever, an e-mail was sent to him earlier today.
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Regarding Prouty and gyroscopic precession:
I just came across the following two excerpts from 'Helicopter Performance, Stability and Control'. "... the summation of the moments produced by aerodynamic, centrifugal, weight, inertial and gyroscopic forces must equal zero." and "... the rotor disk acts as a gyroscopic and remains in its original plane".
Perhaps it is in reference to a small amount of gyroscopic precession that may be present in rotors with offset and flapping hinge stiffness.
[ 06 August 2001: Message edited by: Dave Jackson ]