RD843
Yuzhnoye Design Bureau
The RD843 is a single-chamber, fixed-thrust, restartable liquid-propellant engine developed by Yuzhnoye SDO to produce thrust and control the pitch and yaw of launch vehicle upper stages. It burns nitrogen tetroxide and UDMH propellants and achieves a vacuum specific impulse of 315.5 seconds with a vacuum thrust of 0.25 tf. The engine supports up to […]
Key figurescomparable across the catalogue
- Mass
- 16.5 kg
- Thrust
- 0.25 N
- Specific impulse
- 315.5 s
- TRL
- 9
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- Propellants
- NT + UDMH
- Vacuum Thrust
- 0.25 tf
- Specific Impulse (vacuum)
- 315.5 s
- Propellant Mixture Ratio
- 2.0
- Number of Starts
- 8 (expandable)
- Engine Weight (without gimbal actuators/frame)
- 16.5 kg
- TRL
- 9
About
The RD843 is a single-chamber, fixed-thrust, restartable liquid-propellant engine developed by Yuzhnoye SDO to produce thrust and control the pitch and yaw of launch vehicle upper stages. It burns nitrogen tetroxide and UDMH propellants and achieves a vacuum specific impulse of 315.5 seconds with a vacuum thrust of 0.25 tf. The engine supports up to 8 restarts in its expandable configuration with a proven Technology Readiness Level of 9, reflecting its full operational maturity. Originally developed for the Vega and Vega-C launch vehicles’ AVUM upper stage, the RD843 has demonstrated high reliability across multiple European space missions. Weighing only 16.5 kg excluding gimbal actuators and frame, it is a compact and flight-proven upper stage thruster.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.