Rotor control with negative collective in high speed...

Details Rotor control with negative collective in high speed... Rotor control with negative collective in high speed...

B - Operations, Transporting

64

C

B64C 27/02 (2006.01) B64C 27/52 (2006.01)

Patent

CA 2348856

A method of operating a rotor aircraft at high speeds applies negative collective pitch to the rotor. The rotor aircraft has a wing, a thrust source and a rotor. During horizontal flight, the pilot operates the thrust source to move the aircraft forward. This supplies lift due to air flowing over the wing. By controlling tilt of the rotor, and without supplying power to the rotor, the pilot causes the rotor to auto-rotate due to the forward movement of the aircraft. The speed of rotation of the rotor is controlled by the degree of tilt of the rotor relative to the direction of flight. Once the aircraft speed is sufficiently high to cause reverse flow of air over the entire retreating blade of the rotor, the pilot reduces the collective pitch of the rotor to less than zero to reduce the flapping as desired.

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