FIELD: shipbuilding; marine jet propulsors. SUBSTANCE: nozzle of jet propulsor is arranged coaxially to water flow pipe which is also located inside nozzle. According to another version, water flow pipe is made in form of cone narrowing towards outlet nozzle; nozzle of vapor-and-gas jet engine is conical. EFFECT: enhanced efficiency and survivability of water-jet plants. 3 cl, 3 dwg
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