Inglês/Português
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Back to: "T"tail rotor vortex ring state
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Part I: organization and planning. 2nd ed. Montreal, 2014. (Doc. 9756)
- Contexto
- Effect of the wind. When the wind is on the nose of a helicopter in a hover or at a low speed less than 30 knots, the fuselage and vertical stabilizer tend to weathervane and hold the nose of the helicopter into the wind. If the wind is from a side, the helicopter tends to weathercock in that direction. The requirement for tail rotor thrust varies depending on which side the wind strikes the helicopter. For a helicopter with a CCW rotating main rotor, wind from the left side reduces tail rotor efficiency and creates a tendency to yaw to the right. a) Winds from 120° to 240° relative, helicopter attempts to weather vane its nose into the relative wind. b) Winds from 210° to 330° relative cause a tail rotor vortex ring state to develop. The air flow will be non-uniform and unsteady into the tail rotor creating thrust variations.
- Subárea1
- Rotorcraft
- Related Term
- vortex ring state
- Português
- estol de vórtice do rotor de cauda