Lets look at this yet again. I have added my input to your quote below Lu. I have added it in capitals to distinguish it from your words, the capitals are not intended to be “shouting”. I presume that you are talking about a disc in forward flight.
Lu, you said: >>Try to visualize this, or better still, pick up a pencil and paper and draw a picture of a circle. Cut the circle into four equal parts. On the circumference of the circle where one line meets, write the letter N for North. Now, label the other lines East, West and South. North is the direction the helicopter is flying. The existing way of teaching helo aerodynamics is to say that the blade is stalled over West NO IT IS NOT TAUGHT LIKE THIS AT FT RUCKER, NOR IN OZ/UK TO MY KNOWLEDGE. SEE FLAPPING TO EQUALITY. and because the blades have a precession angle of 90 degrees the effect will take place 90 degrees later or, over South. That sounds reasonable, but can you picture a blade that has a tip speed near the speed of sound flying from an in track position at West to a stalled position over the tail cone at South. THIS IS NOT AT ALL TRUE. SEE FLAPPING TO EQUALITY. Now, try and picture that same blade flying from that low position over South to an in track position over the right side at East. Then, because the pilot has the cyclic in a forward position, that same blade, because of precession, will be flying low over the nose or, North and back up to an in track position over West and then, it starts all over again at the rate of say 250 or more times a minute. Try to visualize the vibratory forces involved if the blade in fact acted as an individual unit. IF THE BLADE WERE INDIVIDUAL YOUR HELICOPTER WOULD BE MASSIVELY OUT OF BALANCE AND YOUR FORWARD CYCLIC WOULD BE THE LEAST OF YOUR CONCERNS.
You also say >> blade flying from that low position over South to<< and then say: >> that same blade, because of precession, will be flying low over the nose or, North<< .
Think about it Lu, this would mean that front and back would be low……..so tell me how we fly in a direction?
If you are teaching this, your teaching qualification needs to be examined.
If you want to keep it simple, use gyroscopic precession as it neatly explains everything simply, as per Ft Rucker. BUT, if you want to teach reality, it is more accurate to use aerodynamic precession. See Heedm’s excellent explanations, But either way, stop teaching the above…it is not true.