Wonderboy

The gyroscopic precession states that a gyroscope (such as the rotor blades) will experience an effect at 90 degrees from where the original force was exerted (as you said).

Lets say you want to fly forward, you tilt the cyclic control forward and the swashplate tilts forwards ... so far so good. According to the law of procession, in a counterclockwise rotating rotor, the rotor blades must not be at maximum pitch when they reach the tail (to lift it) but in fact 90 degrees before this point which is to the west (if nose is facing north).

So even though the swashplate tilts north, maximum pitch is achieved when the rotor blade is pointing west, which has a lifting force on the tail (which is pointing south) !!!

Very confusing, very clever