|Country of origin||United States|
|Manufacturer||Pratt & Whitney|
|Propellant||LOX / LH2|
|Mixture ratio||4.5 to 6.2|
|Thrust (SL)||200-250 kN (50,000-65,000 lbf)|
|Isp (vac.)||465 seconds (4.56 km/s)|
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 (4.56 km/s) 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).
- "Pratt & Whitney's RL60 Moves Closer to Completion" (Press release). Pratt & Whitney. April 22, 2003. Retrieved June 1, 2012.