Propeller for aircraft or the like

Details Propeller for aircraft or the like Propeller for aircraft or the like

1990-07-10

1991-11-19

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Multiple axially spaced working members

Circumferentially offset

416124, 416127, B64C 1148

Patent

active

050661957

ABSTRACT:
A propeller for an aircraft or a blower or fan, wherein the propeller blades are intended for operation at speeds characterized by blade tip Mach numbers in the range of about 0.4 to 0.8, comprises at least two pairs of diametrically opposed blades, the blade pairs being arranged at a spacing angle .epsilon. of between about 15.degree. and 50.degree. between them, and the magnitude of the spacing angle being inversely related to the magnitude of the blade tip Mach numbers, thereby to effect a reduction in the level of the rotational sound harmonics by interference. The pairs of blades may be axially spaced from one another, i.e., arranged in respective spaced parallel planes of rotation, shifted, with the rear one of two adjacent blades leading in the direction of rotation.

REFERENCES:
patent: 921423 (1909-05-01), MacKaness
patent: 1073413 (1913-09-01), Faehrmann
patent: 1868008 (1932-07-01), Gardner
patent: 1944525 (1934-01-01), Pereyra
patent: 2126221 (1938-08-01), Sessums
patent: 2691419 (1954-10-01), Anderson
patent: 3023813 (1962-03-01), Fengler
patent: 3592559 (1971-07-01), Ward
patent: 3830587 (1974-08-01), Shipes et al.
patent: 4483658 (1984-11-01), Levine
patent: 4514146 (1985-04-01), Nojiri et al.
patent: 4676459 (1987-06-01), Seefluth

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