| 摘要 |
The present invention relates to a propulsion device for a surface going water craft which is attached to the vessel's transom or under the bottom and includes a in the water immersed electric propulsion motor in a water protected housing - a pod (1) - which, through a drive shaft (6) is connected with a pumpjet propulsor (3); which includes a stator constructed of an odd number of vanes (7), which extends substantially from the center of the propulsor to a surrounding circular nozzle (8) and are distributed with an even division around a symmetry axis along the drive shaft (6), and a rotor within the nozzle (8) fixed to the drive shaft (6), with the rotor during operation drives the craft forward. A rapid rotation of the rotor blades (5) can give rise to a highly fluctuating load on the rotor blades (5) as well as the guide vanes (7). The interaction between the vanes (7) and rotor blades (5) is critical in trying to create a load case as even and static as possible, which in turn implies that the components can be made thinner. This provides several benefits from a noise, efficiency, weight and cost perspective.
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