To: Helmet Fire
I do not teach it that way. The entire text was in response to those individuals that believe that when the blade stalls over the left side it drops down because of the stalling. The way I teach it is as follows;
In order for a helicopter to fly the rotor must generate equal lift across the disc otherwise there would be a rolling moment and subsequent pitching of the disc. In a retreating blade stall condition the right side of the disc is generating more lift than the left side. It is this differential of lift that causes the disc to raise 90-degrees later and the disc flaps back. However it is not instantaneous so the disc will become unstable and the lift differential will generate a left rolling moment. Shortly thereafter the rolling moment will manifest itself by causing the disc to flap back due to gyroscopic precession.
In order for you or anyone else to accept that theory you must accept gyroscopic precession and the lift equality/Lift inequality concept. If you don’t, then the last few minutes on the keyboard were in vain.
A similar condition exists in the inflow roll/transverse flow effect. There is a lift differential resulting in gyroscopic precession causing a rolling moment. The reason the roll is not as violent as retreating blade stall is that you are moving at about 20-Knots and not the speeds required to induce retreating blade stall.
I shall now retreat to the bomb shelter.