ABOUT RAPTOR 2
Raptor 2 is a full-flow staged combustion cycle engine developed by SpaceX for the Starship launch system. It burns subcooled liquid methane and liquid oxygen, achieving very high chamber pressures and efficiency. Raptor 2 simplified the design of the original Raptor, reducing part count and manufacturing complexity while increasing thrust.
Image: SpaceX
PERFORMANCE
| Thrust (Sea Level) | 2,256 kN (507,000 lbf) kN |
| Thrust (Vacuum) | 2,500 kN (562,000 lbf) kN |
| ISP (Sea Level) | 327 s s |
| ISP (Vacuum) | 350 s s |
| Chamber Pressure | 30 MPa (4,351 psi) bar |
| Mass | 1 kg |
| Thrust-to-Weight | 143 |
| Throttle Range | 40–100% |
| Restart Capable | Yes (multiple) |
THRUST CONVERSIONS (VACUUM)
| Kilonewtons | 2.0 kN |
| Pounds-force | 450 lbf |
ENGINE CYCLE
Full-Flow Staged Combustion
The most advanced cycle: both fuel-rich and oxidizer-rich preburners drive separate turbopumps, and all exhaust flows into the main chamber. Maximizes performance and enables extreme chamber pressures. Only the SpaceX Raptor has flown with this cycle.
PROPULSION
| Propellant | Liquid Methane (CH₄) |
| Oxidizer | LOX |
| Engine Cycle | Full-Flow Staged Combustion |
| Mixture Ratio | 3.6:1 |
| Flow Rate | ~650 kg/s kg/s |
PHYSICAL
| Dimensions | 1.3 m diameter × 3.1 m length |
| Combustion Chambers | 1 |
| Nozzle Expansion Ratio | 40:1:1 |
GENERAL
| Manufacturer | SpaceX |
| Country | United States |
| Status | Active |
| First Flight | April 22, 2026 |
VARIANTS (3)
- Raptor 2
- Raptor 2 Boost
- Raptor 2 Center
VEHICLES USING RAPTOR 2 (2)
- Starship
- Super Heavy
ENGINE LINEAGE
⚖ PROPELLANTS
🏢 MANUFACTURER
