NOZZLE FOR MULTI-CHAMBER LIQUID-PROPELLANT ROCKET ENGINE Russian patent published in 1999 - IPC

FIELD: multi-chamber liquid-propellant rocket engines. SUBSTANCE: nozzle includes three or four shortened interconnected by means of wall over inner sections of perimeter. Wall has form of hypocycloid with three of four branches. Common widening portion of nozzles is connected with shortened nozzles over outside sections of perimeters and has form of epicycloid in section with three of four branches. EFFECT: reduced mass; maximum use of rocket mid-section and possibility of regulation of geometric degree of expansion in height of rocket flight; enhanced economical efficiency of engine; reduced base drag. 2 dwg