Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Integrally shaped or blended into hub
Patent
1981-11-20
1983-12-06
Shepperd, John W.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Integrally shaped or blended into hub
416239, 416245R, B64C 1114
Patent
active
044190530
ABSTRACT:
Propeller apparatus including a propeller spinner with a plurality of spaced protruding surfaces extending radially outward from the exterior surface of the spinner and a plurality of variable pitch propeller blades extending radially outward from the spinner through the protruding surfaces of the spinner. Each propeller blade has an inner or root end portion located adjacent to the protruding surface of the spinner and the root end portion has a propeller cuff attached to it or alternatively the root end portion can have an airfoil section. Each protruding surface has a portion thereof which is substantially spherical shaped and the adjacently located root end portion has a propeller cuff or the airfoil section with an inner surface which is curved to substantially match the spherical shaped surface and as a consequence any substantially gap is eliminated between the substantially spherical shaped surface and the adjacently located curved inner surface when the propeller blade is varied through at least a portion of its forward operationally pitch range. This lack of any substantial gap reduces or eliminates drag and hence improves the efficiency of the propeller apparatus.
REFERENCES:
patent: 2289400 (1942-07-01), Woods
patent: 2408677 (1946-10-01), Owner
patent: 2592214 (1952-04-01), Wallace
patent: 2614638 (1952-10-01), Beaupre
patent: 2934150 (1960-04-01), Fink
Fairchild Swearingen Corporation
Pitko Joseph M.
Shepperd John W.
York Michael W.
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