RL60
| Country of origin |
 United States
|
|---|---|
| Manufacturer | Pratt & Whitney |
| Liquid-fuel engine | |
| Propellant | LOX / LH2 |
| Mixture ratio | 4.5 to 6.2 |
| Cycle | expander |
| Performance | |
| Thrust (SL) | 200-250 kN (50,000-65,000 lbf) |
| Thrust-to-weight ratio | 59 |
| Isp (vac.) | 465 seconds (4.56 km/s) |
The RL60 (also called MB-60) is a cryogenic rocket engine under development by Pratt & Whitney. The design is a high energy LH2/LOX expander cycle, capable of multiple restarts in space.
In 2003, Pratt & Whitney Rocketdyne had 90% of the work completed for the new RL60 replacement of the RL10 engine. The RL60 is a cryogenic upper stage engine, designed to produce 60,000 pounds of thrust with a specific impulse of 465 seconds to meet the evolving needs of expendable launch requirements or human-rated missions.
The RL60 was to be built and tested domestically with key components to be provided by four international industry strategic suppliers; Volvo Aero of Sweden (Regen cooled nozzle), Ishikawajima-Harima Heavy Industries (IHI) of Japan (Fuel Turbopump), Techspace Aero of Belgium (Fuel Inlet and LOX control valve) and Chemical Automatics Design Bureau (CADB) of Russia (LOX Turbopump).
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