![Optimal-time quadcopter descent trajectories avoiding the vortex ring and autorotation states - ScienceDirect Optimal-time quadcopter descent trajectories avoiding the vortex ring and autorotation states - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0957415820300428-gr1.jpg)
Optimal-time quadcopter descent trajectories avoiding the vortex ring and autorotation states - ScienceDirect
Simulation of a helicopter in Vortex Ring State through a coupled simulation of multi-body dynamics and aerodynamics"
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