1.   A helicopter rotor pops out of the top of his head for quick getaways, and he can run in great leaps on giant legs.

2.   Bullets from small-arms fire began winking off the helicopter rotors.

3.   Opponents said the ban would have harmed industries exporting items like helicopter rotors, which could be used for peaceful purposes as well as for military aircraft.

4.   Some would land vertically using rocket engines or helicopter rotors, rather than parachuting or gliding to a landing like all previous spacecraft that have returned to Earth.

5.   The dull roar of helicopter rotors sent the streets into a panic.

6.   The sound of helicopter rotors overhead will give way again to the songs of birds.

7.   At that altitude, the atmosphere is too thin for helicopter rotors to function.

8.   Fenestron is a helicopter tail rotor with many slender blades rotating in a short duct.

9.   The helicopter rotor clipped the mountainside and the pilot, who was killed instantly, was found still strapped inside the wrecked aircraft.