Marine propulsion system with bypass eductor
US6004173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H2011/081
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A jet propulsion system is provided for a water craft in which the secondary flow channel allows water to flow around the impeller region and bypass the impeller blades under certain conditions. The bypass feature provided by the secondary flow channel decreases static inlet pressure and improves the operation of the marine propulsion device at high speeds. In addition, the secondary flow channel increases the total mass flow of water through the steering rudder and therefore improves steering when the propulsion system is being rapidly decelerated, such as during sudden stopping conditions. The secondary flow channel can incorporate one or more individual conduits that bypass the impeller region of the propulsion system or, alternatively, can comprise an annular channel completely surrounding the impeller region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.