Low-resistance hydrofoil

Details Low-resistance hydrofoil Low-resistance hydrofoil

1989-07-05

1990-12-04

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

416235, F01D 514

Patent

active

049750232

ABSTRACT:
A low-resistant hydrofoil comprises at least one concave step arranged backwardly in the direction of a chord of blade of the hydrofoil in parallel with the leading edge of the hydrofoil to form a lamellar cavitation layer on the negative pressure surface of the hydrofoil moving under water. The concave step has depth .DELTA.t and .DELTA.t/C is more than 0.001 and less than 0.01, being a chord length. The concave step is 0<x.sub.1 /C<0.1, x.sub.1 being a distance from the leading edge of said hydrofoil and C being a chord length.

REFERENCES:
patent: 1606887 (1926-11-01), Moody
patent: 1864803 (1932-06-01), Clark
patent: 3077173 (1963-02-01), Lang
patent: 4822249 (1989-04-01), Eckardt et al.
patent: 4846629 (1989-07-01), Takigawa

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