| 摘要 |
A propulsion system for water craft and in particular for high speed propulsion such as for torpedos, hydrofoil craft, and the like, includes a power engine, particularly a gas turbine, which is connected through a reducing transmission to a shaft drive. The shaft drive permits the rotation of two ship screws independently of each other and advantageously includes one drive shaft arranged concentrically within a hollow outer drive shaft for the respective screws. One of the shafts and the associated screw is connected for driving in the lower velocity range and rotates at a relatively low speed of rotation and the other screw is connected for operation at high velocity range and rotates at higher speeds of rotation. Preferably the ship screw for high cruising speed is provided in front of the ship screw for a lower cruising speed and the forward ship screw advantageously provides a guiding blading for the rear ship screw. The ship screw for low speeds may be removed such as by blasting it off with an explosive charge after the propulsion has been taken over by the high speed screw. Instead of arranging the shafts of the screws coaxially they may be arranged one above the other such that the low speed screw is lifted up out of the water when the vessel, such as a hydrofoil vessel, reaches a planing speed.
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