Twin-rudder system for large ship
US6886485B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2002 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | May 7, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H2025/066
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In such a high lift twin-rudder system that: a pair of high lift rudders 1, 2 is arranged behind a single propeller 3; the respective high lift rudder 1, 2 has a top end plate 6, 7 and a bottom end plate 8, 9 at the top end and the bottom of a rudder blade 4, 5; the respective rudder blade 4, 5 is provided with a reaction fin 10, 11, protruding from an inboard face of the rudder blade 4, 5 on a nearly same level with the axis of the propeller 3, that is originated nearly from the leading edge portion toward the rear and has a fixed chord length; the reaction fin 10 of the rudder blade 4 that faces on the board-side where the propeller blades rotate in the ascending direction assumes a posture that makes such attack angle that the ratio of a forward vectored thrust to a drag, both produced by a propeller slip stream having a stream component in the ascending direction, becomes maximum; and the reaction fin 11 of the rudder blade 5 that faces on the board-side where the propeller blades rotate in the descending direction assumes a posture that makes such attack angle that the ratio of a forward vectored thrust to a drag, both produced by a propeller slip stream having a stream compon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.