| 1. | Fiery vortex rings are also a commonly produced trick by fire eaters.
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| 2. | The phenomenon, known as vortex ring state, can occur with any helicopter.
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| 3. | The formation, motion and interaction of vortex rings have been extensively studied.
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| 4. | This applies, in particular, to the formation and motion of vortex rings.
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| 5. | In the 1960s, Rayfield and Reif established the existence of quantized vortex rings.
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| 6. | If altitude permits, autorotations may also be used to recover from vortex ring state.
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| 7. | He is also ordering further tests into vortex ring state.
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| 8. | And a Pentagon report released last month recommended further testing to diagnose vortex ring state.
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| 9. | Devices have been invented which generate bubble vortex rings.
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| 10. | A vortex ring can also be created by a spinning propeller, as in a blender.
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