ABOUT RD-0124
The RD-0124 is a high-performance upper stage engine designed by KBKhA (Chemical Automatics Design Bureau) for the Soyuz 2.1b and Angara upper stages. It uses a staged combustion cycle burning RP-1 and LOX, achieving an impressive 359 seconds of specific impulse. The RD-0124 replaced the older RD-0110 to provide improved payload capacity for upgraded Soyuz variants.
Image: Roscosmos
PERFORMANCE
| Thrust (Sea Level) | N/A (upper stage) kN |
| Thrust (Vacuum) | 294 kN (66,100 lbf) kN |
| ISP (Sea Level) | N/A s |
| ISP (Vacuum) | 359 s s |
| Chamber Pressure | 16.2 MPa (2,350 psi) bar |
| Mass | 572 kg |
| Thrust-to-Weight | 52 |
| Throttle Range | Not throttleable |
| Restart Capable | No |
THRUST CONVERSIONS (VACUUM)
| Kilonewtons | 294.0 kN |
| Pounds-force | 66,094 lbf |
ENGINE CYCLE
Staged Combustion
In staged combustion, one propellant is burned with the turbopump exhaust, then all products are injected into the main chamber for complete combustion. This achieves higher chamber pressures and efficiency. Used by the RS-25 (SSME) and RD-180.
PROPULSION
| Propellant | RP-1 |
| Oxidizer | LOX |
| Engine Cycle | Staged Combustion |
| Mixture Ratio | 2.6:1 |
| Flow Rate | ~83 kg/s kg/s |
PHYSICAL
| Dimensions | 2.4 m diameter × 1.58 m length |
| Combustion Chambers | 4 |
| Nozzle Expansion Ratio | 101.7:1:1 |
GENERAL
| Manufacturer | KBKhA (Chemical Automatics Design Bureau) |
| Country | Russia |
| Status | Active |
| First Flight | April 22, 2026 |
VARIANTS (2)
- RD-0124
- RD-0124A
VEHICLES USING RD-0124 (2)
- Soyuz 2.1b
- Angara (upper stage)
ENGINE LINEAGE
RD-0110→RD-0124
⚖ PROPELLANTS
