On a helicopter, what is vortex ring state?
- Tip vortex build-up during hover.
- Tip vortex interference at high forward speed.
- Ground vortex interference when hovering close to the ground.
Explanation from PART66Online
Vortex ring state arises when the rotor settles into its own recirculating tip-vortex wake at low or zero forward speed, so the blades meet their own downwash and lift collapses. It is a low-speed recirculation phenomenon, not something that occurs at high forward speed or simply from proximity to the ground.
bhavon asked · 11 Oct 2017
please explain the answer
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