LR-91
Type: Upper Stage Engine
Country of Origin: United States
Manufacturer: Aerojet
First Flight: September 1, 1964
Status: Retired
Propellant (O/F): Nitrogen Tetroxide/Aerozine 50
Mixture Ratio (O/F by mass): 1.86
Cycle: Gas generator
Chambers: 1
Thrust (vac.): 467 kN
Thrust (s.l.): 232.7 kN
Throttle: none
ISP (vac.): 316 s
ISP (s.l.): 160 s
Chamber Pressure: 860 psi
Nozzle Ratio: 49.2:1
Burn time: 247 s
Ignitions: 1
Mass: 589 kg
Length: 2.81 m
Diameter: 1.63 m
Used in: Titan family
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