Abstract: An icebreaking vessel (10) with icebreaking reamers (23a, 23b) at each side and, in connection with the reamers, propellers (24a, 24b) for the propulsion of the vessel. The icebreaking vessel can be formed by attaching a detachable icebreaking bow section (31) equipped with reamers and propellers in connection with them to any such ship (30) which is not an actual icebreaker and which has corresponding joint members for attaching the detachable bow section to the ship.

Abstract: The invention is a multi-purpose icebreaker having main propulsion devices in the front part of the vessel and steering device in the aft part of the vessel. This kind of icebreaking vessel has excellent steering characteristics and it can efficiently and constantly push the ice field. The main propulsion devices at the bow are azimuth propulsion devices or conventional shaft propulsion devices. The steering devices are tunnel thrusters or smaller azimuth thrusters.

Abstract: An asymmetric bridge of a ship where the main navigation workstation is located aside the center line of the ship on the starboard side of bridge at the starboard end of the bridge. The front bulkhead of the bridge is directed from the main navigation workstation to the port side of the ship in an angle abaft the beam. The aft bulkhead of the bridge is directed from the main navigation workstation to the port side of the ship in an angle between the direction of center line of the ship. The angle is preferably 10.degree.-15.degree. and the angle 40.degree.-45.degree.. The angle of the field of vision is about 320.degree. seen along the bulkheads of the bridge.

Abstract: A stern arrangement for a ship where the stern of the ship is made modifiable or convertible for at least two different purposes by moving or by replacing at least a part of the stern. The stern of the ship is convertible to be a towing notch or to be equipped with a stern roller. The invention provides an icebreaker which is equipped with a towing notch in wintertime and with a stern roller in the summertime for open water operations.

Abstract: A hull for improved seakeeping characteristics of an icebreaking ship so that the breadth of the ship's hull will be decreased on the aft side of a wide foreship in the vicinity of the waterline. It can be implemented with solid hull form or so that on the side of the hull there is a section removable with respect to the solid hull, location or position of which will be changed with respect to the hull. In the solid structure on the side of the hull there will be formed a recess and above it a reamer, rising towards the stern and formed by a sloping surface. The recess forms a pass between the bilge keel and the reamer becoming wider towards the stern and joining the hull's narrower part of the aft body of the ship.