The RD-843 is the one-chamber multi-start pressurized fuel feed rocket engine.

Engine is intended for creation thrust and flight control in two stabilizing channels of Vega LV upper stages. Thrust vector control is effected through an engine rotation in a gimbal suspension in two perpendicular planes.


Technical characteristics Value
Propellant components:





NTO (N2O4)

UDMH ((CH3)2N2H2)

Vacuum thrust, kgf 250
Vacuum specific propulsive burn, s 315,5
Cruise engine mass (without plate and gears), kg 15,93
Number of restarts during the flight 5
Operating time during the flight per 5 restarts, s 667