Abstract: A ship construction comprises a symmetrical hull having two screw propellers which are symmetrically arranged in respect to the longitudinal central plane of the hull. A rudder is mounted aft of the screw propellers and preferably in the central plane. The propellers and the rudder are so dimensioned that the diameter of each propeller is less than the spacing between the center lines of the two propeller shafts. In addition, the distance between the axes of the propellers is equal to or less than the diameter of each propeller plus the thickness of the rudder. The arrangement provides an improved propulsive efficiency without loss in maneuverability.