One of the mysteries of the English language finally explained.
1A hub with a number of radiating airfoils that is rotated in an approximately horizontal plane to provide the lift for a helicopter or other rotary-wing aircraft.
- ‘He barely dodged a humongous hammer that flew past him and destroyed the main rotor on one of the remaining helicopters.’
- ‘With a soft hum of power the large rotors started up and the officers were off, soaring up to investigate the powerless upper levels of the massive city.’
- ‘He fired up the engine and the rotors began to whirl.’
- ‘I could hear the thwapping of helicopter rotors, the grinding of tank treads, the sound of RPG's and bazookas.’
- ‘The helicopters' rotors started turning, first slowly, then faster and faster, making a loud chopping noise as they cut the air.’
- ‘The aircraft would have launched standing upright like a rocket, but instead of using a blast of fire to take off the pilot would have simply adjusted the thrust and pitch of the rotors as with a helicopter.’
- ‘The aircraft featured two large rotors located in nacelles on the ends of its wings linked to an air-cooled Daimler Benz 600 engine in the fuselage.’
- ‘The rotors started to spin up and they hurriedly jumped to the roof a few feet below, ducking to avoid the backwash from the spinning propellers as the copter lifted off the heliport and headed into the night skyline.’
- ‘They heard the engine revving and the quickening beat of the rotors.’
- ‘The helicopter rises up over the ridge line, the noise of the rotors scattering the targets below.’
- ‘They were pretty useless when confronted with the high-pitched whine of the rotor's gears directly above our heads.’
- ‘He opened the door and leapt out while the rotors were still spinning and brushed off his clothes.’
- ‘Then the sound of rotors is heard, and they look up, only to see the two Serpent helicopters hovering above them.’
- ‘Will gave a light two fingered salute to those staying, as the rotors whirred and the chopper left.’
- ‘The shot was from a news helicopter and Cecil could hear the thudding of the helicopter rotors in the background as the reporter began to speak.’
- ‘You'll hear your rotor speeding up and slowing down, and the roar of missiles as they fly by you.’
- ‘He walked up to Blaine just as the helicopter rotors disengaged.’
- ‘As the rotors slowed, a side hatch opened and the Security Chief climbed out, followed by Director Bakan and their respective aides.’
- ‘The sound of the helicopter's rumbling rotors became louder, as it flew by directly overhead us, and began hovering over the red smoke.’
- ‘He raised his suntanned right arm to his face and shielded his eyes from the swirling clouds of dirt and dust kicked up by the Dauphin's rotors.’
2The rotating assembly in a turbine, especially a wind turbine.
- ‘Standing at the base of one of the towers, there's only a gentle whoosh as the rotors sweep around.’
- ‘To achieve this same increase using a larger rotor is usually a more expensive choice than placing a smaller rotor on a higher tower where it will receive stronger winds.’
- ‘A fearless reaper, it pivots on its tower to face the wind, propellerlike rotor already scything around, faster and faster.’
- ‘Should they malfunction or prove insufficient to slow the rotor in high winds, a large disk brake mounted on the generator shaft can smoothly bring the turbine to a halt.’
- ‘Take away the 2.2 birds killed by the rotors, and the balance for wind energy, + 1707.8 birds per turbine a year, is not bad.’
- ‘‘The bigger the rotor, the more wind you can collect,’ Sagrillo explained.’
- ‘Wind plant rotors have either two or three blades.’
- ‘The higher-wattage plants, with their large-diameter, low-rotation-per-minute rotors, are designed to capture energy from low wind speeds.’
- ‘The wind generated by the rotors while sitting on the ground is tremendous.’
- ‘The rotor turns an attached generator, creating electricity with a simple elegance, carving energy from the sky.’
- ‘She had to return to Southampton and have the turbine rotors completely redesigned and rebuilt.’
- 2.1 The armature of an electric motor.
- 2.2 The rotating part of the distributor of an internal combustion engine that successively makes and breaks electrical contacts so that each spark plug fires in turn.
- ‘Unlike a piston engine, where reciprocating parts move up and down, the twin rotors in the Mazda just spin around.’
- ‘This time we had lost the rotor arm as well and Phil had to sprint back 100 yards to find it.’
- ‘For example, if D hires a car to P and then removes the rotor arm from it rendering it inoperable, he may be guilty of criminal damage.’
- ‘Rear rotors are vented on the GT and solid on the V - 6.’
- ‘The heavy impact damaged the rotor arm and though he carried on, Andrew was handicapped by a misfiring engine and could only struggle home sixth.’
- ‘Motorists who failed to immobilise their cars, by taking away the rotor arm from the distributor, were liable to find their tyres deflated by the police.’
- ‘It might have been tougher for Godfrey had the Cooper S of his competitors not lost nearly 10 minutes right at the start of the Radnor stage with a broken rotor arm.’
- ‘While Freestone had a good run on his first experience of the stage, they had a nightmare when a broken rotor arm cost them over two minutes.’
- ‘I immediately changed the oil, plugs, distributor cap, rotor arm, and a friendly independent specialist fixed the exhaust.’
- ‘After 20 minutes he decided the problem was with the rotor arm, and fashioned some wire underneath it to solve the problem.’
- 2.3 The rotating container in a centrifuge.
- ‘The Department of Energy rejected the claim that the country was importing aluminum tubes to produce centrifuge rotors for enriching uranium.’
- ‘One junior intelligence analyst thought that although they weren't at all like modern American centrifuge rotors, they might be usable in what are known as a Zippe centrifuge.’
- 2.4 The rotary winder of a clockwork watch.
A large eddy in which the air circulates around a horizontal axis, especially in the lee of a mountain.
Early 20th century: formed irregularly from rotator.
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