RD840
Yuzhnoye Design Bureau
The RD840 is a liquid-propellant low-thrust engine developed by Yuzhnoye SDO, intended for use in space launch vehicle apogee stages and spacecraft orbital maneuvering systems. It operates on nitrogen tetroxide and unsymmetrical dimethylhydrazine (UDMH) propellants with a pressurized feed system, and is capable of up to 100 restarts over a total operational time of 2,750 […]
Typed specifications5 values
Discloses 3 of 10 fields engineers filter by in this category (category median 3).
- Mass
- 4.3 kg product page
- Specific impulse
- 315 s product page
- Propellant
- NTO (N2O4 or MON) product page UDMH
- Feed / tank pressure
- 10 bar product page
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier9 lines, in the manufacturer's own wording
- Propellants
- NT + UDMH
- Vacuum thrust
- 40.7 kgf
- Specific impulse (vacuum)
- 315 s
- Propellant mixture ratio
- 2.05
- Chamber pressure
- 10 kgf/cm2
- Number of ignitions
- 100
- Total operation time
- 2,750 s
- Engine mass
- 4.3 kg
- Feed system
- Pressurized
About
The RD840 is a liquid-propellant low-thrust engine developed by Yuzhnoye SDO, intended for use in space launch vehicle apogee stages and spacecraft orbital maneuvering systems. It operates on nitrogen tetroxide and unsymmetrical dimethylhydrazine (UDMH) propellants with a pressurized feed system, and is capable of up to 100 restarts over a total operational time of 2,750 seconds, making it ideal for multi-burn mission profiles such as apogee kick maneuvers, orbit raising, and station-keeping. The engine produces 40.7 kgf of vacuum thrust with a specific impulse of 315 seconds. Its lightweight design at 4.3 kg makes it suitable for small spacecraft and upper stage applications. It is used as the lunar lander propulsion engine in Yuzhnoye’s light-class and flying lunar lander concepts.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.