Abstract: A device for ice-breaking with a vessel has two functionally separate upper and lower elements of different widths. The upper, wider element is situated next to the water line for breaking unbroken ice, and the lower, narrower element is situated below the upper element and for transporting broken ice sideways and under the unbroken ice. The upper wider element has a flat lower portion abaft an inclining front part with a small frame angle and breaks ice downward when moving ahead, and a flat stern part with a small frame angle and breaks ice downward when moving astern. The lower element has vertical side portions which in the forebody and the afterbody have a marked wedge-shape and shove broken ice sideways. Transport of broken ice sideways and astern can be augmented by bow propellers and wing propellers.

Abstract: Methods and arrangements of releasably mooring a ship in a definite position at a distance from land with an ability to return later to the same place. The mooring is accomplished by means of a substantially ring-shaped mooring unit, which can be raised and lowered and which has a gap along its periphery, which can be connected to and disconnected from the ship by a connectable part located below the surface of the water. The mooring unit enables a ship carrying a downwardly protruding load to pass by after disconnection and lowering of the mooring unit, and to be rotated round an essentially vertical imaginary axis.

Abstract: Methods and arrangements of releasably mooring a ship in a definite position at a distance from land with an ability to return later to the same place. The mooring is accomplished by means of a substantially ring-shaped mooring unit, which can be raised and lowered and which has a gap along its periphery, which can be connected to and disconnected from the ship by a connectable part located below the surface of the water. The mooring unit enables a ship carrying a downwardly protruding load to pass by after disconnection and lowering of the mooring unit, and to be rotated round an essentially vertical imaginary axis.

Abstract: A catamaran vessel includes two hulls which are mutually connected by a cargo deck. A superstructure includes passenger spaces and is supported by a web structure which extends generally along each hull. Each longitudinal side wall of the superstructure is formed from a latticework beam whose plane is oriented generally vertically and whose longitudinal axis extends essentially horizontally. The latticework beams are fixedly connected to the wall structures. The floor and ceiling structures of the superstructure are connected to the latticework beams so as to greatly stiffen the superstructure and to render the beams highly resistant to bending forces. Consequently, the spaces defined between the longitudinal profiles of the beams and the struts are essentially free of deformation forces when the vessel is at sea. The spaces can be used essentially completely for windows, and the wall structures can be given a relatively low natural bending resistance.

Abstract: A pitch stabilized vessel includes at least one displacement hull constructed for high propulsion speeds of, for instance, 35 knots. The hull is configured so as to locate the pitching center of the vessel far forwards on the hull, for instance, at a point corresponding to 75% of the length of the hull from the stern thereof. Generally horizontal and elongated fins extend along the hull and project out from the actual hull in the stern half thereof. The fins extend from the stern-edge of the hull through a distance corresponding to one-third of the length of the hull. The fins have a total horizontally projected surface area which corresponds to at least 5% of W/d, where W is the total underwater volume at construction draft and d is the hull construction draft.