RS-56
Type: Lower Stage Engine
Country of Origin: United States
Manufacturer: Rocketdyne
First Flight:
Status: Active (as RS-27A)
Propellant (O/F): Liquid Oxygen/Kerosene
Mixture Ratio (O/F by mass):
Cycle: Gas generator
Chambers: 1
Thrust (vac.):
Thrust (s.l.): 920.8 kN (RS-56-OBA); 269.0 kN (RS-56-OSA)
Throttle: none
ISP (vac.): 299 s (OBA); 316 s (OSA)
ISP (s.l.): 263 s (OBA); 220 s (OSA)
Chamber Pressure: 696 psi
Nozzle Ratio:
Burn time: 172 sec (OBA); 283 sec (OSA)
Ignitions: 1
Mass:
Length:
Diameter:
Used in: Atlas II
Links: