Although a rotor disc might 'coincidently' display the 'odd' similar characteristic, it is NOT the same. Even considering them as having some of the same characteristics will only confuse the issue, especially when you try to explain some more complex helicopter effects. Trust me; leave the precession for a GYRO. The rotor disc is a completely different beast.
[This message has been edited by Baque Flip (edited 21 December 2000).]