There is no disk!!!!!!!! There is only a set of free to flap and feather blades.
The blade is merely a wing. It reacts to pitch and velocity.
When pitch or velocity changes, the lift forces change. No different to the wing of a plane. When alpha changes cyclically like a helicopter, then blade flies up and blade flies down, when it changes on a plane, wing flies up or wing flies down. Plane does not roll or rotate 90 degrees every time the pitch (therefore lift and drag, etc) changes..... Must be the lack of angular momentum I guess.....
So the blade is clever enough to know that it should change it's behaviour based not on cyclical pitch change, but because it must act as a gyroscope? And it knows this because when it was a normal aerodynamic wing, it was getting the airflow at roughly the same velocity across it's whole body, but now it is a wing of a helicopter it can tell that the airflow is slow on one end of it, and fast on the other....... Therefore, if your airflow is slow at the root and fast at the tip, you should behave gyroscopically as a wing. Is that the idea?
Or....does a helicopter wing (blade) behave as a wing and react to airflow velocity and pitch changes like all other wings?