FIELD: solid-propellant missiles with unterwater start. SUBSTANCE: device has a diaphragm secured on the heavy ring made on the nozzle wall with the aid of destructible members of the rated section. On the side of the nozzle throat section the diaphragm has an annular flange receiving a sleeve connected to the diaphragm by the destructible member of the rated section. An opening is made in the diaphragm opposite the sleeve, and the sleeve in the cross-section is made in the form of a polyhedron, whose diameter of the described circumference exceeds the diameter of the nozzle throat section. The device provides for engine leak-proofness at a missile ejection from the launching barrel before engine starting. EFFECT: enhanced safety at an emergency immersion of the underwater vehicle by filling the engine case with intake water. 1 dwg
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