Engine Model: RD-103. Manufacturer Name: RD-103. Government Designation: 8D52. Other Designations: 8D71. Designer: Glushko. Developed in: 1947-53. Application: R-5. Propellants: Lox/Alcohol. Thrust(vac): 500.000 kN (112,400 lbf). Thrust(sl): 432.000 kN (97,117 lbf). Isp: 243 sec. Isp (sea level): 216 sec. Burn time: 120 sec. Mass Engine: 870 kg (1,910 lb). Diameter: 1.65 m (5.41 ft). Length: 3.12 m (10.23 ft). Chambers: 1. Chamber Pressure: 23.90 bar. Thrust to Weight Ratio: 58.62. Country: Russia. Status: Out of Production. First Flight: 1953. Final extrapolation of the V-2 rocket engine in Russia. Designer at OKB-456 was V A Vitkin. Glushko states 'thus ended the German page' of German engine technology in the USSR (this ignores the fact that the German ED-140 design provided the basis for the entire next generation of Soviet rocket engines). The engine introduced automatic thrust regulation in flight, a feature first advocated by Groettrup's German team for the G-1 engine.