Propeller shroud

Details Propeller shroud Propeller shroud

1987-02-06

1988-12-06

Powell, Jr., Everette A.

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing with mounting means

416189, 440 67, B63H 514

Patent

active

047893028

ABSTRACT:
A propeller shroud or nozzle, made with airfoil section of high lift to drag ratio, increases thrust, speed and efficiency of a fixed or controllable pitch propeller operating inside the shroud. Shroud section is designed with continuously curved inside and outside surface to create maximum lift and minimum drag. For the larger propellers used on ships, and for lower cost of construction, shroud is fabricated using plates of steel and stainless steel or other suitable material, built as a number of straight airfoil segments forming a polygon approximating circular ring. Low shroud drag makes possible improving thrust and speed of vessels, even when operating at high speed, compared to optimally designed propeller without the shroud.

REFERENCES:
patent: 2030375 (1936-02-01), Kort
patent: 2139594 (1938-12-01), Kort
patent: 3056374 (1962-10-01), Linhardt
patent: 3986787 (1976-10-01), Mouton et al.
patent: 4166596 (1979-09-01), Mouton et al.
patent: 4219303 (1980-08-01), Mouton et al.
patent: 4509925 (1985-04-01), Wuhrer

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