1.   The grenade went up through the roof of my Huey, up through the spinning rotor blades.

2.   In a disc-brake system, the fluid pressure moves the piston against the back of the brake pad, forcing it against the spinning rotor.

3.   The constantly spinning rotor of a modern flywheel stores excess electricity produced by motor-generator combinations.

4.   To fight the tendency of a helicopter to turn in the opposite direction to its spinning rotor system, Savov has removed the engine that spins the main rotors.

5.   A stream of anxious people dodge out from under the spinning rotor blades, and run to a U.S. military cargo plane.