What happens in Tail Rotor Vortex Ring State?

• A. Tail rotor tip cortices are recirculated through the tail rotor
• B. Tail rotor tip vortices dissipate
• C. Tail rotor AOA increases
• D. Tail rotor blades stall

Answer: (A)

Tail rotor vortex ring state happens when the helicopter descends into the downwash created by the main rotor, so the tail rotor sits in a torus of swirling air. In this environment, the tail rotor’s own tip vortices are drawn back into the rotor disk and recirculated through the blades. That recirculation drastically reduces tail rotor thrust, making yaw control unstable and can lead to a rapid, unpredictable turn if not corrected. The problem isn’t that the vortices dissipate or that the blades stall outright; it’s that the rotor is ingesting its own wake, which robs the tail rotor of effective thrust. To recover, increase forward airspeed and reduce descent rate to move out of the wake, then progressively restore tail rotor thrust.