Method for improving the ice-breaking properties of a water craft and a water craft constructed according to the method

Abstract

A method of providing a watercraft, especially an icebreaker or a cargo ship, tanker or similar transport vessel, with improved ice penetration characteristics and a watercraft manufactured according to the method, which watercraft has a hull (1) with a first end (2) and a second end (3) and which is equipped at said second end with a propulsion arrangement, which provides the main propulsive thrust of the watercraft, while the watercraft moves with either end ahead, and the steering of the watercraft, whereby said second end (3) of the watercraft is shaped and designed so that it, as such, has efficient ice penetration characteristics. Said propulsion arrangement is chosen so as to include at least three propulsion devices, at least the majority of which are rudder propeller devices (4) and which are arranged at least at two different distances from said second end (3) of the watercraft so that when the watercraft moves in ice or ice build-ups said second end (3) ahead, the propeller with one or more propulsion devices located near said second end (3) of the watercraft is arranged to break ice and the propeller with one or more propulsion devices located farther away from said second end (3) of the watercraft is arranged to remove disintegrated ice or ice chunks away from the ice build-up.

Description

【Technical field】 [0001] The invention relates to a method of providing a ship according to the subject-matter of claim 1, in particular to an icebreaker or cargo ship, tanker or similar transport vessel with improved ice penetration characteristics, the ship having a hull comprising a first end and a second end, and a propulsion structure is provided at said second end, which provides the main propulsion of the ship and the steering of the ship when the ship moves forward with either end, whereby said second end of the ship The end is shaped and designed so that it has effective ice penetration properties in itself. The invention also relates to a boat according to the subject-matter of claim 7 . 【Background technique】 [0002] There is a need and use for various transport vessels, tankers, service vessels, etc. to operate in icy water and to an increasing extent even in arctic conditions in addition to open water conditions. In practice, in order to travel efficiently, s...

AI Technical Summary

Problems solved by technology

Also the bow shape of the icebreaker is designed for optimized operation especially when breaking through thick flat ice, and therefore ice ridges and accretions are considerably more challenging when moving forward

In order to ensure mobility and maneuverability, for example, when moving and turning in open waterways, even if the icebreaker is required to have a certain icebreaking ability when moving backwards, the icebreaking ability of the icebreaker when moving backwards is usually substantially worse than when traveling forward

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