Method of and apparatus for increasing propulsive efficiency of

Details Method of and apparatus for increasing propulsive efficiency of Method of and apparatus for increasing propulsive efficiency of

1981-10-09

1983-12-27

Hornsby, Harvey C.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Resilient bias or mount

416193R, 416158, B64C 1112, B64C 1140

Patent

active

044228287

ABSTRACT:
Hub flexures affording beamwise flapping (i.e. flapping perpendicular to the original tip-path plane), mount aircraft propellers through a hub assembly to a drive shaft of a fixed wing aircraft for increasing propulsive efficiency. The hub flexures permit the propeller blades of the fixed wing aircraft to exhibit advantageous beamwise flapping and reach equilibrium positions in response to loading conditions which would otherwise result in efficiency loss. The flexures permit only flapping perpendicular to the original tip-path plane and provide blade rigidity in radial, in-plane and torsional loading. The propeller blades may also be of the variable pitch variety wherein the flexures are advantageously inboard of the blade pitch change bearings. The flexures further facilitate both passive, or responsive flapping in response to actively induced cylic pitch to achieve maximum propulsive efficiency under any given loading conditions.

REFERENCES:
patent: 727365 (1903-05-01), Holzmark
patent: 4163630 (1979-08-01), Weiland
patent: 4189283 (1980-02-01), McCoubrey

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