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Vortex ring state
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=== Powering out of vortex ring state === It is possible to power out of vortex ring state, but this requires having about twice the power it takes to hover. Only one full-scale helicopter, the [[Sikorsky S-64 Skycrane]], is documented as being able to do this, when unladen.<ref>{{cite web|url= http://scs-europe.net/conf/ecms2007/ecms2007-cd/ecms2007/ecms2007%20pdf/ese_0121.pdf|title= Vortex Ring State Simulation Using Actuator Disc|access-date= 14 March 2022|last1= Dziubinski|first1= Adam|last2= Stalewski|first2= Wienczyslaw|work= Instytut Lotnictwa / Institute of Aviation - Computational Fluid Dynamics Department|year= 2007|archive-url= https://web.archive.org/web/20210818191550/http://scs-europe.net/conf/ecms2007/ecms2007-cd/ecms2007/ecms2007%20pdf/ese_0121.pdf|archive-date= 18 August 2021|url-status= live}}</ref>
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