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  2. Tail rotor - Wikipedia

    en.wikipedia.org/wiki/Tail_rotor

    Tail rotors are simpler than main rotors since they require only collective changes in pitch to vary thrust. The pitch of the tail rotor blades is adjustable by the pilot via the anti-torque pedals, which also provide directional control by allowing the pilot to rotate the helicopter around its vertical axis.

  3. Tiltrotor - Wikipedia

    en.wikipedia.org/wiki/Tiltrotor

    In this mode the rotors provide thrust as a propeller, and the airfoil of the fixed wings takes over providing the lift via the forward motion of the entire aircraft. Since the rotors can be configured to be more efficient for propulsion (e.g. with root-tip twist) and it avoids a helicopter's issues of retreating blade stall , the tiltrotor can ...

  4. Loss of tail-rotor effectiveness - Wikipedia

    en.wikipedia.org/wiki/Loss_of_tail-rotor...

    Main rotor disk vortex interference Weathercock stability Tail rotor vortex ring state. Loss of tail-rotor effectiveness (LTE) [1] occurs when the tail rotor of a helicopter is exposed to wind forces that prevent it from carrying out its function—that of cancelling the torque of the engine and transmission.

  5. Helicopter rotor - Wikipedia

    en.wikipedia.org/wiki/Helicopter_rotor

    Tail rotors are simpler than main rotors since they require only collective changes in pitch to vary thrust. The pitch of the tail rotor blades is adjustable by the pilot via the anti-torque pedals, which also provide directional control by allowing the pilot to rotate the helicopter around its vertical axis, thereby changing the direction the ...

  6. Powered lift - Wikipedia

    en.wikipedia.org/wiki/Powered_lift

    The powered rotors of a tiltrotor (sometimes called proprotor) are mounted on rotating shafts or nacelles at the end of a fixed wing, and used for both lift and propulsion. For vertical flight, the rotors are angled to provide thrust upwards, lifting the way a helicopter rotor does.

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  8. Disk loading - Wikipedia

    en.wikipedia.org/wiki/Disk_loading

    For a given weight, a helicopter with shorter rotors will have higher disk loading, and will require more engine power to hover. A low disk loading improves autorotation performance in rotorcraft. [5] [6] Typically, an autogyro (or gyroplane) has a lower rotor disk loading than a helicopter, which provides a slower rate of descent in ...

  9. NOTAR - Wikipedia

    en.wikipedia.org/wiki/NOTAR

    Although the concept took over three years to refine, the NOTAR system is simple in theory and works to provide some directional control using the Coandă effect. [2] [3] A variable pitch fan is enclosed in the aft fuselage section immediately forward of the tail boom and driven by the main rotor transmission.

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