Stena Rederi Ab

Stena Rederi Aktiebolag

Stig Bystedt

Orvar Toreskog

Henrik Nordhammar

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.

Superstructure for multihull vessels

Pitch stabilized displacement vessel

A hull intended for multi-hull vessels for goods and passenger transport at speeds of, e.g., 30-50 knots is characterized in that the vertical distance from the base line of the hull to the center-of-gravity point of the volume of the underwater body of the hull, up to a water line corresponding to a normal hull draft, is over 55% of the hull draft defined between the base line (BL) and the water line (T) in the case of the stern half of the hull extending between the stern and midships. The hull is also characterized in that the vertical position of the center-of-gravity point of the volume of the forward half of the hull, located beneath the water line and extending between the midships and the forward part of the hull, is less than 55% of the draft, and in that the distance between the base line (BL) and the center-of-gravity point of the frame area beneath the water line (T) at a position corresponding to 75% of the total length of the underwater body of the hull, calculated from the stern, is less than 55% of the draft.

Growing community of inventors

Uddevalla, Sweden

Stig Bystedt