RD860M
Yuzhnoye Design Bureau
The RD860M is a restartable three-assembly cluster main engine with a pneumatic pump feed system developed by Yuzhnoye SDO for lunar lander propulsion applications. It forms a cluster configuration comprising two stationary engine assemblies DB-1 and DB-3, plus a gimballed assembly DB-2 for combined main thrust and directional control. Burning nitrogen tetroxide and UDMH propellants, […]
Key figurescomparable across the catalogue
- Mass
- 112 kg
- Thrust
- 0.5 N
- Specific impulse
- 316 s
- TRL
- 6
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 (main mode)
- 0.5 tf
- Vacuum Thrust (throttled mode)
- 0.25 tf
- Specific Impulse main/throttled (vacuum)
- 322.5 / 316 s
- Propellant Mixture Ratio
- 2.25
- Configuration
- 3 assemblies: DB-1 (stationary) + DB-2 (gimballed) + DB-3 (stationary)
- Number of Starts
- 10 (depends on onboard gas capacity)
- Propulsion System Mass (excl. gimbal actuators)
- 112 kg
- Feed System
- Pneumatic pump
- TRL
- 6
About
The RD860M is a restartable three-assembly cluster main engine with a pneumatic pump feed system developed by Yuzhnoye SDO for lunar lander propulsion applications. It forms a cluster configuration comprising two stationary engine assemblies DB-1 and DB-3, plus a gimballed assembly DB-2 for combined main thrust and directional control. Burning nitrogen tetroxide and UDMH propellants, it produces 0.5 tf in main mode and 0.25 tf in throttled mode, with specific impulses of 322.5 and 316 seconds respectively. The system supports up to 10 restarts and is the baseline engine for the medium-class lunar lander concept. Propulsion system mass is 112 kg excluding gimbal actuators. Used on both expendable and reusable lunar lander variants. Technology Readiness Level is 6.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.