| 摘要 |
A THRUSTER FOR A HELICOPTER IS MOUNTED IN A REAR PORTION OF A TAIL BOOM 16. TWO SETS OF VANES DEFLECT AN AIR FLOW STREAM FLOWING ALONG THE TAIL BOOM RESPECTIVELY TO OPPOSED SIDES OF THE TAIL BOOM. TWO SHUTTERS 46, 48 ARE PIVOTALLY ARRANGED PARTLY AROUND THE SETS OF VANES TO LEAVE TWO OPENINGS IN RESPECTIVE SIDES OF THE TAIL BOOM. 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 CENTRE LINE OF EACH OPENING REMAINS STATIC IRRESPECTIVE OF THE STATUS OF THE OPENING. (FIG. 2)
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