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A thruster for a helicopter is mounted in a rear portion of a tail boom. Two sets of vanes deflect an airflow stream flowing along the tail boom respectively to opposed sides of the tail boom. Two shutters are pivotally arranged partly around the sets of vanes to leave two openings in respective sid

A thruster for a helicopter is mounted in a rear portion of a tail boom. Two sets of vanes deflect an airflow stream flowing along the tail boom respectively to opposed sides of the tail boom. Two shutters are pivotally arranged partly around the sets of vanes to leave two openings in respective sides of the tailboom. The shutters are pivoted in sympathy toward each other or away from each other to open/close the respective openings symmetrically and simultaneously such that a geometrical center line of each opening remains static irrespective of the status of the opening.

대표청구항 ▼

[ I claim:] [1.] In a helicopter including a main rotor, a tail boom having opposed sides and a rear end portion, a longitudinal circulation control slot along a predetermined one side of the tail boom and a thruster which is accommodated in the rear portion of the tail boom, a method of operating t

[ I claim:] [1.] In a helicopter including a main rotor, a tail boom having opposed sides and a rear end portion, a longitudinal circulation control slot along a predetermined one side of the tail boom and a thruster which is accommodated in the rear portion of the tail boom, a method of operating the thruster to control yaw of the helicopter, the method comprising the steps of:directing an air flow longitudinally along the tail boom toward deflecting vanes of the thruster, the deflecting vanes being arranged to deflect longitudinal air flow laterally toward opposed sides of the helicopter and toward openings in the sides of the rear portion of the tail boom; andadjusting, with respect to each opening, a height dimension of the opening using shutters, the height dimension being generally normal to both a longitudinal direction which corresponds to a general direction of extension of the tail boom and a lateral direction which is lateral to the longitudinal direction, the height dimension being generally symmetrical from opposed extremities of the opening such that a geometrical centre of the opening remains substantially static regardless of a status of the adjustment of the respective opening,wherein the shutters rotate about a longitudinal axis of the helicopter.