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Helicopter Vortex Ring State (previously referred by the FAA to as Settling with Power) Escape - YouTube
Vuichard's Recovery | This video is an excellent example of Vuichard's recovery from Vortex Ring. We feel this is a great educational tool for everyone to understand. Well... | By HQ Aviation | Facebook
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Optimal-time quadcopter descent trajectories avoiding the vortex ring and autorotation states - ScienceDirect
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