vortex ring

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vortex ring

n
(General Physics) a stable perturbation in a fluid that takes the form of a torus in which the flow rotates in the section of the torus so that the pressure difference between the inside and outside of the torus balances body forces. The best-known vortex ring is a smoke ring
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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She suggested a case of vortex ring state. I still was questioning the controllability of the aircraft, but, after a couple of confidence checks, I agreed with her assessment.
"The V-22 is much less susceptible to Vortex Ring State [than a helicopter]," Schultz said.
These guidelines are extremely conservative and do not reflect differences in aircraft characteristics, nor do they account for the actual mechanism leading to the vortex ring state. Anyone who has tried to stand under a CH-53E in a hover can attest that the wind velocity (induced velocity) is far than from a Huey.