| 摘要 |
1,037,542. Helicopters. UNITED AIRCRAFT CORPORATION. April 17, 1963 [April 27, 1962], No. 15055/63. Heading B7W. A helicopter has the top of its rotor head covered by a cap, the cap being fixed to non- tilting parts of the rotor head and being spaced from blade control means of the helicopter with the bottom of the cap terminating above the blade control means, the cap being effective, in forward flight of the helicopter, to reduce flow ,of turbulent air from the rotor head across the tail section of the helicopter whereby to reduce aerodynamic exitation of said tail section and vibration in the helicopter consequent thereon. Each drag hinge 60 is provided with a closure cap 69 to the tops of which is secured a domeshaped cap 110 formed with an inwardly extending flange 112 and reinforcing ribs 120. An access aperture 116 is closed by a transparent cover 118. Though increasing the overall drag the cap 110 is stated to reduce vibrations due to turbulent flow from the rotor head to the tail area.
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