Marine propeller with optimized performance blade contour

Details Marine propeller with optimized performance blade contour Marine propeller with optimized performance blade contour

1987-10-08

1989-02-07

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

416243, B63H 126

Patent

active

048028223

ABSTRACT:
A marine propeller (4) combines decreasing overall pitch from hub (6) to blade tip (20) and increasing progressiveness of pitch with increasing radii from hub to tip, and provides uniform loading from hub to tip. The balde has a maximum transverse dimension (36, 46, 48) between the high pressure surface (16) of the blade and a straight line chord (34, 34a, 34b) between the leading edge (22) and the trailing edge (24) of the blade. The ratio of this maximum transverse dimension to the length of the chord is ever increasing from hub to tip. A parabolic blade rake along the maximum radial dimension line (50) of the blade is provided in combination.

REFERENCES:
patent: 1019437 (1912-03-01), Draper
patent: 1455591 (1923-05-01), Lawson
patent: 1639785 (1927-08-01), Sepulveda
patent: 2047847 (1936-07-01), Ambjornson
patent: 3312286 (1967-04-01), Irgens
patent: 3697193 (1972-10-01), Phillips
patent: 4073601 (1978-02-01), Kress
patent: 4080099 (1978-03-01), Snyder
patent: 4331429 (1982-05-01), Koepsel et al.
patent: 4632636 (1986-12-01), Smith
"Everything you Need to Know About Propellers", Third Edition, Mercury Marine, Brunswick Corporation, QS5-384-10M, Part No. 90-86144, 1984.

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