| Country of origin | USA |
|---|---|
| Manufacturer | Rocketdyne |
| Application | Upper stage/Spacecraft propulsion |
| Predecessor | Bell / Rocketdyne LMAE |
| Status | Development Paused |
| Liquid-fuel engine | |
| Propellant | LOX / Liquid Methane (CH4) |
| Cycle | Pressure-fed engine |
| Configuration | |
| Chamber | 1 |
| Performance | |
| Thrust, vacuum | 24.5 kN (5,500 lbf) |
| Used in | |
| Development Planned for Altair (spacecraft) | |
The RS-18 is a reconfigured version of the Rocketdyne Lunar Module Ascent Engine (LMAE), modified to burn liquid oxygen (LOX) and liquid methane (CH4) for NASA's Exploration Systems Architecture Study (ESAS) engine testing in 2008.[1][2]