FIELD: shipbuilding. SUBSTANCE: device has rigid envelope 1 with inner passages 2 which receive hermetic flexible envelope 3 filled with liquid and connected with hydraulic pulser. Envelope 1 has holes closed with plates 4 which are secured rotatably. When internal pressure rises, flexible envelope pushes plates through holes in rigid envelope, thus creating thrust of watercraft. EFFECT: enhanced efficiency. 4 dwg
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