FIELD: water transport. SUBSTANCE: boat propulsive device has combustion chamber working on hydrocarbon fuel in pulsed mode; combustion chamber is connected with water inlet and outlet holes by means of gas duct with straightway branch pipe. Combustion chamber has spherical housing with spherical cap mounted outside; arranged inside cap are reservoirs for fuel and compressed air. Ignition circuit interrupter is operated by man-power drive. Natural gas may be used as fuel for pleasure and sports craft. Device provides for muscle load of sportsmen. EFFECT: enhanced reliability. 4 cl, 7 dwg
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