ICE SHIP, MAINLY DOUBLE-DUTY TANKER, METHOD OF NAVIGATION OF ICE SHIP, PROPULSION UNIT AND MAIN ENGINE PLANT OF ICE SHIP Russian patent published in 2007 - IPC B63B35/08 B63B25/08 B63H5/125 B63H21/00 

FIELD: shipbuilding; carrying liquid cargo in water areas free from ice and in water areas covered with ice.

SUBSTANCE: proposed ship has fore and aft extremities of hull with main engine plant and propeller; engine plant is preferably mounted in aft extremity and is turnable relative to axis deflected from vertical in CL or in plane parallel to it. When running in water area covered with ice, ship moves with her aft extremity forward and vector of propeller thrust is directed at angle relative to plane of waterline contour upward away from center in ship's length, mainly in parallel with average angle of inclination of lower section of ship's bottom near main engine plant. When running in water area free from ice, ship moves with her fore extremity forward and vector of propeller thrust is directed in parallel with plane of waterline contour towards center in ship's length. Direction of propeller thrust vector is changed by turning the main engine plant around inclined axis which is deflected through angle α; vector of engine thrust of main engine plant is also deflected from normal to slewing axis of main engine plant through angle which satisfies the condition 0<α<β/2, where β is angle equal to average angle of inclination of bottom surface to respective extremity of ship in plane of waterline contour at inclined section of bottom located below point of intersection of slewing axis of main engine plant with axis of propeller thrust vector.

EFFECT: enhanced economical and operational efficiency; improved sea-going qualities in water area covered with ice.

24 cl, 7 dwg