Propeller

Details Propeller Propeller

1977-03-28

1978-10-31

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Concave surface

416223R, F04D 2938

Patent

active

041231988

ABSTRACT:
The propeller includes a central hub with a plurality of blades extending radially from equal circumferentially spaced points on the periphery of the hub. The width of each blade at its root is equal to the spacing between adjacent blades and the width of each blade at its tip is equal to one half the width of its root. The leading edge of each blade is normal to a line tangential to the point of connection of the blade to the hub periphery while the trailing edge slants from the tip to the broader root. The length of each blade is one half the diameter of the hub and each blade has an angle of attack of about 17.degree.. This structural dimensioning results in a propeller providing a substantially constant air discharge from the roots to the tips of the blades with a substantial elimination of radial air flow, all to the end that a greater static thrust can be realized for a given horsepower input.

REFERENCES:
patent: 1512545 (1924-10-01), Kaplan
patent: 2336303 (1943-12-01), Schubert
patent: 2524870 (1950-10-01), Adamtchik
patent: 3332500 (1967-07-01), Bristol et al.
patent: 4040769 (1977-08-01), Britz

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