Structure for steering a water-craft

Abstract

The invention relates to an arrangement for steering a water-craft, which comprises at least one main propulsion device which is arranged to push the water-craft forward or backward, and a number of steering propulsion devices, the pushing direction of which can be changed. The steering propulsion devices are arranged in the aft of the water-craft on both sides of the said at least one main propulsion device so that the steering of the water-craft is continuously provided by means of the steering propulsion devices without any separate rudder means or the like to be functionally connected to said at least one main propulsion device.

Description

technical field [0001] The present invention relates to a structure for steering a watercraft, which comprises at least one main propulsion device arranged to push the watercraft forward or backward, and a plurality of steering propulsion devices, the direction of which can be changed. Background technique [0002] Watercraft or ships here mean all kinds of ships, eg yachts, passenger ships, icebreakers and different cargo ships. Structures are known in which the watercraft is provided with two mechanically linked propellers with rudders behind them, two or three independent pod propulsion units or propellers with rear rudders in the pod propulsion units. Counter-rotating propellers. The last mentioned has been disclosed in WO publication 01 / 54971, where the pod propulsion unit is indicated by reference 4 and the propeller by reference 3 . [0003] Prior art solutions include substantial disadvantages. Firstly, the mechanical propeller structure has a long axis, and the s...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the electrical configuration of two or more pod propulsion units is the high cost, since efficient pod propulsion units require engine-driven generators, along with their power control systems

These are expensive, bulky and big

For example, in RoRo ships, due to the engine room and the separation required by the machinery, since these are partly located on the cargo deck, it becomes more difficult to handle the cargo

This means that some unfavorable narrow sections are formed in the cargo space, so the rear end of the cargo space is still narrow

The bulky motor further leads to an unfavorable position of the center of gravity of the displacement in the longitudinal direction

[0006] In a counter-rotating pod / thruster combination, there is only one steering gear, which is generally considered a disadvantage from a reliability standpoint

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