Reduced-noise propulsion system of air-cushion vehicle
US5096013A · kind A · utility
9Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Nov 14, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64D2033/0206
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.