RD870
Yuzhnoye Design Bureau
The RD870 is a single-chamber dual-thrust staged combustion cryogenic rocket engine developed by Yuzhnoye SDO, designed as the primary propulsion unit for the Cyclone-4M and Cyclone-5 first stages. It burns liquid oxygen and kerosene propellants, producing 79.3 tf of sea-level thrust and 89.4 tf of vacuum thrust, with specific impulses of 301.5 seconds at sea […]
Key figurescomparable across the catalogue
- Mass
- 1,420 kg
- Thrust
- 79.3 N
- Specific impulse
- 301.5 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
- O2 + kerosene
- Sea Level Thrust
- 79.3 tf
- Vacuum Thrust
- 89.4 tf
- Specific Impulse (sea level)
- 301.5 s
- Specific Impulse (vacuum)
- 340 s
- Propellant Mixture Ratio
- 2.68
- Number of Starts
- 1
- Engine Weight (excl. gimbal drives)
- 1,420 kg
- Cycle
- Staged combustion, dual-thrust
- TRL
- 6
About
The RD870 is a single-chamber dual-thrust staged combustion cryogenic rocket engine developed by Yuzhnoye SDO, designed as the primary propulsion unit for the Cyclone-4M and Cyclone-5 first stages. It burns liquid oxygen and kerosene propellants, producing 79.3 tf of sea-level thrust and 89.4 tf of vacuum thrust, with specific impulses of 301.5 seconds at sea level and 340 seconds in vacuum. Four RD870 engines are clustered on the Cyclone-4M and Cyclone-5 first stages to form the RD874 propulsion system with a combined thrust of 319.2 tf at sea level. The dual-thrust capability enables optimal performance during different atmospheric flight phases. The engine weighs 1,420 kg excluding gimbal drives and has achieved Technology Readiness Level 6 through the Cyclone-4M development program.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.