Propeller for ship

Details Propeller for ship Propeller for ship

1982-10-22

1985-04-30

Marcus, Stephen

Fluid reaction surfaces (i.e., impellers)

Multiple axially spaced working members

Circumferentially offset

416175, 416238, B63H 120

Patent

active

045141460

ABSTRACT:
In a propeller for use in a ship of the type comprising 4 or more even number blades, at least one of two adjacent blades is inclined forwardly or rearwardly or one inclined forwardly and the other rearwardly so as to make different the rake angles of the two blades. The pitch angle of the rearwardly inclined blade is made larger than that of the forwardly inclined blade. With this construction the mutual interference between adjacent blades is efficiently utilized to prevent decrease in the efficiency even when operating conditions and the diameter of the propeller vary.

REFERENCES:
patent: 118325 (1871-08-01), Zahn
patent: 1012441 (1911-12-01), Reid
patent: 1715071 (1929-05-01), Martens et al.
patent: 2978233 (1961-04-01), Davey
patent: 4306839 (1981-12-01), Pien

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