Please explain retreating blade stall in R-22.?

Question

Please explain retreating blade stall in R-22.?

Answer 1

R22 is a particular model of helicopter. All helicopters are subject to retreating blade stall.

The helicopter blades are basically wings. They will only supply lift if they are moving through the air faster than the stall speed. As the helicopter moves forward the blades on one side of the helicopter move forward faster than the helicopter itself. That blade that is spinning forwards is called the advancing blade. On the other side the blades are move slower than the helicopter. Those blades are called the retreating blades because they are spinning towards the back.

As the forward speed of the helicopter increases, the air speed of the advancing blade increases and the air speed of the retreating blade decreases. At some point the retreating blade will have such a low air speed that it will stall and stop providing lift. That is retreating blade stall.