MARINE PROPULSOR Russian patent published in 2003 - IPC

FIELD: shipbuilding. SUBSTANCE: proposed propulsor has body secured in fairing for reciprocating motion of working member mounted on rod of drive. Drive is made in form of hydraulic cylinder and piston-blade is used as working member for performing motion in cylinder secured in propulsor body by means of struts at clearance between body and cylinder forming nozzle directed to side opposite to fairing, thus creating thrust for motion of water craft at forward stroke of piston-blade due to displacement of water from cylinder at simultaneous filling space between fairing and piston-blade through nozzle and clearance between cylinder and body with water due to hydrostatic pressure and pressure of piston-blade. At reverse stroke of piston-blade, water is displaced from cylinder between fairing and piston- blade through clearance and nozzle, thus also creating thrust for motion of water craft. EFFECT: enhanced efficiency due to avoidance of idling of working member. 1 dwg