ABOUT RD-191
The RD-191 is a single-chamber derivative of the RD-170 family, designed by NPO Energomash for the Angara launch vehicle family. It uses the same oxygen-rich staged combustion cycle and achieves exceptional performance from its single chamber. The engine represents one-quarter of the four-chamber RD-170 and is Russia’s modern workhorse first-stage engine.
Image: Roscosmos
PERFORMANCE
| Thrust (Sea Level) | 1,920 kN (432,000 lbf) kN |
| Thrust (Vacuum) | 2,090 kN (469,500 lbf) kN |
| ISP (Sea Level) | 311 s s |
| ISP (Vacuum) | 337 s s |
| Chamber Pressure | 26.2 MPa (3,800 psi) bar |
| Mass | 2 kg |
| Thrust-to-Weight | 93 |
| Throttle Range | 27–105% |
| Restart Capable | No |
THRUST CONVERSIONS (VACUUM)
| Kilonewtons | 2.0 kN |
| Pounds-force | 450 lbf |
ENGINE CYCLE
Oxygen-Rich Staged Combustion
PROPULSION
| Propellant | RP-1 |
| Oxidizer | LOX |
| Engine Cycle | Oxygen-Rich Staged Combustion |
| Mixture Ratio | 2.63:1 |
| Flow Rate | ~630 kg/s kg/s |
PHYSICAL
| Dimensions | 2.1 m diameter × 3.78 m length |
| Combustion Chambers | 1 |
| Nozzle Expansion Ratio | 36.87:1:1 |
GENERAL
| Manufacturer | NPO Energomash |
| Country | Russia |
| Status | Active |
| First Flight | April 23, 2026 |
VARIANTS (2)
- RD-191
- RD-191M
VEHICLES USING RD-191 (2)
ENGINE LINEAGE
⚖ PROPELLANTS
