Other Designations: S2.1150. Designer: Isayev. Developed in: 1953-59. Application: Burya booster. Used on stages: Burya booster. Used on launch vehicles: Burya. Propellants: Nitric acid/AmineThrust(vac): 68,440 kgf. Thrust(vac): 671.20 kN. Isp: 250 sec. Isp (sea level): 218 sec. Burn time: 70 sec. Mass Engine: 650 kg. Diameter: 1.2 m. Length: 1.9 m. Chambers: 4. Chamber Pressure: 53.00 bar. Country: Russia. Status: Developed 1953-59. References: 342 , 344 . Comments: Booster engine for Burya missile. Two used to boost ramjet second stage to ignition conditions. Engines developed by Isayev from R-11 S2.253 engine. Early Buryas had S2.1100 engine. Two thrust levels. 671,20 / 477 kN sea-level.