Rotary wings and control system that generates the lift and thrust for a helicopter.
1 Something about the thwop of the rotor blades must have lulled her.
2 And then the welcoming thrum of helicopter rotor blades filled the air.
3 Even the clumsy rotor blades of the old helicopters had been banished.
4 The sudden, total deceleration ripped the rotor blades away from the helicopter.
5 God, her heart was booming as loud as the rotor blades .
6 The rhythmic thwack of rotor blades receded as it disappeared over the ridgeline.
7 Everyone except Maria Chen duck-walked out of the range of the rotor blades .
8 The motor changed pitch, the prop hummed, the rotor blades cut the air.
9 But for standard choppers, rotor blades compensate by being flexible.
10 The Sikorsky S-92 helicopter stood waiting, its huge rotor blades now at full speed.
11 Again, the rotor blades were making that growling steel-drum sound.
12 Its rotor blades spread themselves apart, like a butterfly unfolding.
13 It has guards around the rotor blades to minimize rotor-strike.
14 Giant pistons thumped, and rotor blades carved scythe-like through whatever surface fell beneath their blades.
15 Saul could hear rotor blades more clearly now, high and to the south but coming closer.
16 What bragging rights?' Lock asked, struggling to be heard above the thud of the rotor blades .
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