| 11. | They had blocked the way to the elixir with a fierce mechanical contraption of sharp rotating blades.
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| 12. | Dual counter-rotating blades prevent this situation due to having two advancing and two retreating blades with balanced forces.
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| 13. | For an electric fan, the modulation of the sound waves by rotating blades would be my prime suspect.
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| 14. | The winning design was an 18-metre tall red steel structure, in a fan design with 10 rotating blades.
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| 15. | Myers said heavy dust clouds created by the chopper's rotating blades during a landing probably caused the crash.
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| 16. | Myers said heavy dust clouds created by the chopper's rotating blades during a landing probably caused the accident.
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| 17. | In the 1970s JPL studied many rotating blade and ring sails for a mission to rendezvous with Halley's Comet.
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| 18. | He then cranked the prop, started the engine, circled about the rotating blades, clambered into the cockpit, and departed.
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| 19. | Local environmentalists are cautiously supportive, though they have reservations about the effect of the rotating blades on marine life.
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| 20. | One woman was killed and two men were injured when they were hit by its rotating blades, police said.
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