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In a helicopter having a main rotor, a tail boom and a circulation control slot along one side of the tail boom, and a thruster which is selectively directable at either side or both sides of the rear end of the tail boom, anti-torque and yaw control are effected by generating separate air flow stre

In a helicopter having a main rotor, a tail boom and a circulation control slot along one side of the tail boom, and a thruster which is selectively directable at either side or both sides of the rear end of the tail boom, anti-torque and yaw control are effected by generating separate air flow streams of different pressures by means of separate pressure means and conducting said separate air flow streams at said different pressures in separate passages to respectively the circulation control slot and to the thruster.

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A method of operating a helicopter to effect anti-torque and yaw control which helicopter includes a main rotor, a tail boom having opposed sides and a rear end, a longitudinal circulation control slot along a predetermined one side of the tail boom, and a thruster which is selectively directable at

A method of operating a helicopter to effect anti-torque and yaw control which helicopter includes a main rotor, a tail boom having opposed sides and a rear end, a longitudinal circulation control slot along a predetermined one side of the tail boom, and a thruster which is selectively directable at either side or both sides of the rear end of the tail boom, the method including generating, by means of a first pressure means, a first flow stream of air at a first relatively higher pressure, conducting the first flow stream via a first passage along the tail boom to the circulation control slot and guiding the first flow stream to exit via the circulation control slot laterally toward said predetermined one side of the tail boom to effect an anti-torque and yaw control reaction force on the tail boom; generating, by means of a second pressure means, a second flow stream of air at a second pressure relatively lower than said first pressure, conducting the second flow stream via a second passage along the tail boom to the thruster and selectively guiding the second flow stream of air in controlled manner to exit via the thruster to either side or both sides of the tail boom, thus completing, in co-operation with said anti-torque and yaw control reaction force, anti-torque and yaw control of the helicopter.