RS-25/SSME
Type: Lower Stage Engine
Country of Origin: United States
Manufacturer: Rocketdyne
First Flight: April 12, 1981
Status: Active
Propellant (O/F): Liquid Oxygen/Liquid Hydrogen
Mixture Ratio (O/F by mass):
Cycle: Staged Combustion
Chambers: 1
Thrust (vac.): 2090 kN (100% throttle)
Thrust (s.l.): 1670 kN (100% throttle)
Throttle: 65% to 109%
ISP (vac.): 452 s
ISP (s.l.): 366 s
Chamber Pressure: 2994 psi
Nozzle Ratio: 69:1
Burn time:
Ignitions: 1
Mass:
Length: 4.3 m
Diameter: 2.4 m
Used in: Space Shuttle (STS), SLS
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