Why can a helicopter stay on the ground and lift off the ground with the blades spinning at the same speed?

Question

In other words, if spinning blades super fast doesn’t give a helicopter the lift it needs, then what does?

In: Physics

Answer 1

When you stick your hand out of the window on a car ride, you change the angle of your hand to make the wind lift or drop your arm. Helicopters can do the same thing with their blades, changing their angle mid rotation with the swash plate. That’s what let’s it lift only the front, side, back, or all at once