| 摘要 |
<p>The invention describes a marine propulsor (31) that has a rotor (46) that is, at least in its marjority, enclosed by structure where the rotor receives water over at least part of its upper portions. It is possible to delete the gas flow by use of one or more valves (48) so that an approximate doubling of water flow rate occurs which is valuable as a thrust enhancer for low and mid-range vehicle speed operation. It is also possible to operate the rotor with water directed mainly to its lower portions but with little partial vacuum over the upper portions of the rotor vanes. When used, a water directing valve (48) that directs water to the rotor vanes preferably has a curvilinear water contacting surface so that water will adhere to and follow that structure. A simple steering and reversing system for marine propulsors is also proposed. It includes a steering rudder (45) that is in mechanical communication with reversing guide vanes or nozzles (44) such that movement of the steering rudder causes a common movement of the reversing guide vanes or nozzles. A reversing gate (49) is used to block discharge flow when in reverse.</p> |
