Marine propeller with addendum

Details Marine propeller with addendum Marine propeller with addendum

1988-10-06

1989-09-12

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

416237, B63H 126

Patent

active

048655201

ABSTRACT:
A marine propeller (4) has a plurality of blades (12, 13, 14, and 15) each with an integral addendum (34) extending rearwardly from the trailing edge (30) of the positive pressure surface (26) of the blade. A particular combination of blade area ratio and blade rake is provided to enable quick acceleration to a high-speed on-plane condition in blade surfacing racing applications, and without bobbing up and down. The blade area ratio is at least 40%, and the blade rake is 10.degree. to 25.degree..

REFERENCES:
patent: 395538 (1889-01-01), Biduald
patent: 408864 (1889-08-01), Vogelgesang
patent: 1190755 (1916-07-01), Hahn
patent: 2357084 (1944-08-01), Cleofe
patent: 3065723 (1962-11-01), Tulin
patent: 3077173 (1963-02-01), Lang
patent: 4552511 (1985-11-01), Sumigawa
"Everything You Need To Know About Propellers", Mercury Marine Division, Brunswick Corporation, 1984, QS5-384-10M, Part No. 90-86144.
"Marine Applications of Titanium And Its Alloys", Titanium Metals Corporation of America, 195 Clinton Road, West Caldwell, N.J. 07006, Nov. 29, 1968.

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