Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Responsive to fixed actuator
Patent
1984-03-26
1987-03-17
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Responsive to fixed actuator
416132R, B64C 27605
Patent
active
046504001
ABSTRACT:
A helicopter blade positioning mechanism provides collective and cyclic pitch angle adjustment of the blades independently. This mechanism is all enclosed within the blade driving axle. The pitch angle of each blade is adjusted collectively and cyclicly by direct action on and within the blade hub. No other linkage is required between the blade and the blade pitch actuation means. The cyclic pitch adjustment of each blade is obtained either by a rotation imparted to the whole blade body or by twisting the blade, depending upon the mechanism configuration used. In both cases, the cyclic pitch variations are superimposed on the collective pitch setting, vary sinusoidally as the blades gyrate around their vertical axis of gyration, one full pitch variation cycle for each full gyration of the blades. This mechanism plays the role and replaces the well known swash-plate/linkage arrangement used on most helicopters.
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