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| Specification | RL10A-3-3A (1981) | RL10A-4 (1991) | RL10A-5 |
|---|---|---|---|
| Applications | Centaur upper stage | Centaur upper stage | DC-X and -XA RLV demonstrators |
| Propellants | LOX/LH2 | LOX/LH2 | LOX/LH2 |
| Thrust in Vacuum | 16500 lb | 20800 | 14650 |
| Isp in vacuum(s) | 442.4 | 449.0 | 368.0 |
| Mixture Ratio | 5.5:1 | 5.5:1 | 6:1 |
| Weight | 310 lb | 370 | 316 |
| Chamber Pressure | ??? | ||
| Expansion Ratio | ??? | ||
| Engine Cycle | ???? | ||
| Pump Design Pressures | ???? | ||