The invention relates to shipbuilding and may be used on ships for transportation of goods, preferably liquid, like water area covered by ice, and by pure water. Propulsion unit vessel ice class tanker double action having a housing with terminal completes sloped bottom portions, comprises a main propulsion system with a propeller connecting unit with the hull pivotally-supporting structure comprising obliquely disposed with respect to the waterline contour plane annular supporting elements for Fitting around the rotation axis of the support elements - the rotary axis of the installation. Propulsion unit is pivotable main propulsion system with simultaneous change of the azimuth angle of the axis of rotation of the propeller with respect to the diametral or a plane parallel thereto and a tilt angle in the range of from parallel waterline plane of the contour to the parallel underlying inclined portion of the bottom end of the vessel at the site of placement of the propulsion unit, for which plane annular supporting elements and response setting them annular vessel support elements arranged with an inclination towards cent a vessel at an angle α to the waterline in a diametral plane of the contour or a plane parallel thereto, equal to the angle of rotation of the propeller axis deviation from the normal to the rotary axis of the main propulsion unit of the propulsion system and satisfy the condition 0 α≤β / 2, where β - the angle of inclination of the downstream corresponding portion of the bottom end of the vessel, the angle between the axis of rotation of the propeller and the rotary axis of the main propulsion unit in the propulsive vessel is 90 ° ± α. The technical result achieved useful model is to improve the efficiency and effectiveness of the main propulsion and ride quality icebreaking ship dual action by optimizing the main running direction of the thrust vector propulsion main; the propulsion unit relative contours of the hull when moving both aft end forward on the coated ice water area, and the nose tip forward when driving on clean water by optimizing the water flow vector direction allocated from the propulsion unit substantially parallel lines of hull, providing a reduction in the frictional resistance of the hull and break the ice optimization process through selected angles of arrangement directions of the propulsion unit and the contours of the vessel when the vessel motion advantageously ormovoy tip forward without compromising the characteristics of the vessel when moving in open water preferably bow forward.
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