Lu wrote: "This is very true if you are flying an autogyro and not a helicopter. The entire theory of flapping up of the advancing blade is based on autogyro aerodynamics. What causes flapback is the increased lift on the advancing side of the blade causing a lift differential across the disc and gyroscopic precession causes the so called flap back. It is a very mild case of retreating blade stall. Only in this case the retreating blade is not in the stall range it is just generating less lift. The pilot counters this condition by restoring the position of the disc by pushing forward cyclic or, if the swash plate remains in the original position and the pilot does not correct, the delta hinge effect will pull pitch out of the blade on one side and increase the pitch on the other side and the gyroscopic precession (if I worked this out in my head correctly) will cause the helicopter to roll left."
It is not retreating blade tip stall because the blade is not at a stalling angle of attack, it is just dissymetry of lift. The disc will not roll left, it just pitches up until the disc returns to an equilibrium state. If you have the balls to go along for the ride it will pitch up until the aircraft is flying backward, at which point it will act to pitch the nose down. A useful demonstration of aerodynamic theory.
Funny SeiesmicPilot, no mention of the Bell LTE problems, or the original mast-bumping Bells.
Good day