DUAL-CALIBER ROCKET Russian patent published in 2009 - IPC F42B15/00 

FIELD: weapons and ammunition.

SUBSTANCE: proposed dual-caliber rocket comprises a separable engine, annular nozzle with a threaded bush, the said nozzle being mounted on the sustainer stage tail part and coupled with the engine by means of annular sectors with external ledges. The said threaded bush, on the engine side, has a circular tapered recess. The engine front end has a nut with inner and outer thread and an annular shoulder matching the circular tapered recess in the threaded bush. The bush is screwed on the separable engine front end and its outer thread has a lock nut pressed towards the thrust end face arranged on the engine outer front part.

EFFECT: higher rigidity of separation unit when sustainer stage comes out of its seat.

4 dwg