| 31. | The same phenomenon occurs with any fluid, creating vortex rings which are invisible but otherwise entirely similar to smoke rings.
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| 32. | Within a stationary body of fluid, a vortex ring can travel for relatively long distance, carrying the spinning fluid with it.
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| 33. | As they hovered above the target, however, the first helicopter experienced a hazardous airflow condition known as a vortex ring state.
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| 34. | The V-22, she said, would not encounter vortex ring state if pilots operated it within the flight envelope, or prescribed limits.
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| 35. | Brow descended too fast, with too little airspeed, sending his aircraft into a condition called vortex ring state, the report said.
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| 36. | Some coherent structures, such as vortex rings, etc . can be large-scale motions comparable to the extent of the shear flow.
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| 37. | This new non lethal weapon the vortex ring gun, is planned to be mounted on a hand held system the Gl-6.
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| 38. | The fourth stage of each level is a race of sorts, which sees Zephyr flying through vortex rings surrounding the totems.
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| 39. | Some of the tests will focus on a phenomenon called " vortex ring state, " which causes the aircraft to descend rapidly.
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| 40. | A vortex ring is also formed when a mass of fluid is impulsively pushed from an enclosed space through a narrow opening.
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