Government Designation: 11D33. Other Designations: S1.5400. Designer: Korolev. Developed in: 1958-60. Application: Molniya 8K78-3. Used on stages: Molniya 8K78-3. Used on launch vehicles: Molniya 8K78. Propellants: Lox/KeroseneThrust(vac): 6,670 kgf. Thrust(vac): 66.70 kN. Isp: 340 sec. Burn time: 207 sec. Mass Engine: 153 kg. Chambers: 1. Chamber Pressure: 53.50 bar. Country: Russia. Status: Out of Production. First Flight: 1960. Last Flight: 1970. Flown: 25. References: 177 . Comments: Originally designed by Korolev; passed to Isayev for production. Began a series of engines leading through the 8D726 for GR-1 to the Block D for the N1 and Proton. Earliest versions with 6380 kgf and 338.5 sec specific impulse.