RD861K
Yuzhnoye Design Bureau
The RD861K is a restartable main engine with turbopump feed system developed by Yuzhnoye SDO, using a gas generator cycle with exhaust generator gas injected into the supersonic nozzle section for enhanced efficiency. It burns nitrogen tetroxide and UDMH propellants and is designed for upper stage applications on Cyclone-family launch vehicles, supporting up to 5 […]
Typed specifications6 values
Discloses 5 of 10 fields engineers filter by in this category (category median 3).
- Mass
- 214 kg product page
- Thrust
- 77 629 441.4 mN product page
- Specific impulse
- 330 s product page
- Propellant
- NTO (N2O4 or MON) product page UDMH
- TRL
- 8 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 supplier8 lines, in the manufacturer's own wording
- Propellants
- NT + UDMH
- Vacuum thrust
- 7.916 tf
- Specific impulse (vacuum)
- 330 s
- Propellant mixture ratio
- 2.4
- Number of starts
- 5
- Engine weight
- 214 kg
- Feed system
- Turbopump (gas generator cycle)
- TRL
- 8
About
The RD861K is a restartable main engine with turbopump feed system developed by Yuzhnoye SDO, using a gas generator cycle with exhaust generator gas injected into the supersonic nozzle section for enhanced efficiency. It burns nitrogen tetroxide and UDMH propellants and is designed for upper stage applications on Cyclone-family launch vehicles, supporting up to 5 restarts for multi-burn mission profiles including geostationary transfer orbit and sun-synchronous orbit insertions. With a vacuum thrust of 7.916 tf and specific impulse of 330 seconds, it provides high-efficiency propulsion derived from the proven Cyclone-4 program. TRL 8 reflects its near-operational readiness. The engine weighs 214 kg and has undergone extensive ground development testing as part of the Cyclone-4 and Cyclone-4M programs.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.