RD809M
Yuzhnoye Design Bureau
The RD809M is a four-chamber staged combustion cryogenic rocket engine developed by Yuzhnoye SDO for upper stage main propulsion, enabling pitch, yaw, and roll control through individual gimballing of each engine chamber in one plane. It burns liquid oxygen and kerosene propellants, producing a combined 9 tf of vacuum thrust with a specific impulse of […]
Key figurescomparable across the catalogue
- Mass
- 325 kg
- Thrust
- 9 N
- Specific impulse
- 345 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
- Vacuum Thrust
- 9 tf
- Specific Impulse (vacuum)
- 345 s
- Propellant Mixture Ratio
- 2.5
- Number of Chambers
- 4
- Number of Starts
- 1
- Engine Weight (excl. gimbal drives)
- 325 kg
- Cycle
- Staged combustion
- TRL
- 6
About
The RD809M is a four-chamber staged combustion cryogenic rocket engine developed by Yuzhnoye SDO for upper stage main propulsion, enabling pitch, yaw, and roll control through individual gimballing of each engine chamber in one plane. It burns liquid oxygen and kerosene propellants, producing a combined 9 tf of vacuum thrust with a specific impulse of 345 seconds. The multi-chamber architecture provides redundancy and thrust vector control capability without requiring separate attitude control thruster systems. Weighing 325 kg excluding gimbal drives, the RD809M has achieved Technology Readiness Level 6, demonstrating its operation in a relevant environment. It is designed for medium-thrust upper stage applications where combined attitude control and main propulsion in a single unit reduces system mass and complexity.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.