Reduced-noise propulsion system of air-cushion vehicle

Details Reduced-noise propulsion system of air-cushion vehicle Reduced-noise propulsion system of air-cushion vehicle

1990-11-14

1992-03-17

Marmor, Charles A.

Motor vehicles

Surface effect vehicles

Having propulsion or control means

180116, 181292, 181290, 244 1N, 415119, B60V 114

Patent

active

050960130

ABSTRACT:
Noise due to the rotation of the air propeller or fan of an air-cushion vehicle is reduced by: 1) reducing the cross-sectional area of the interior of a duct encompassing the fan on the downstream side relative to the upstream side; 2) using wide-chord fan blades of chords increasing from blade root to tip; 3) using a duct and a nose cone on the hub of the fan both having a sound-absoring structure; and 4) mounting the engine and the duct on a common rigid support base and reducing to a minimum the tip clearance between the tips of the fan blades and the duct inner wall surface.

REFERENCES:
patent: 3002341 (1961-10-01), Muzzy et al.
patent: 3078939 (1963-02-01), Bollum
patent: 3542152 (1970-11-01), Adamson et al.
patent: 4156475 (1979-05-01), Chaplin
patent: 4290500 (1981-09-01), Hopkins et al.
patent: 4313512 (1982-02-01), Jutras
patent: 4433751 (1984-02-01), Bonneau
patent: 4441578 (1984-04-01), Rose
patent: 4759513 (1988-07-01), Birbragher
patent: 4828175 (1989-05-01), Heufler et al.
patent: 4840541 (1989-06-01), Sakane et al.
patent: 4848501 (1989-07-01), Goodwin et al.

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