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Government Designation: 8D43 + 11D43. Designer: Kosberg. Application: UR-500 stage 1 original concept. Used on stages: UR-500 Monoblok Stage 1M, UR-500 Polyblock Stage 1P. Used on launch vehicles: Monoblock UR-500, Polyblock UR-500. Propellants: N2O4/UDMH Thrust(vac): 229,200 kgf. Thrust(vac): 2,247.45 kN. Isp: 310 sec. Isp (sea level): 280 sec. Burn time: 115 sec. Chambers: 1. Country: Russia. Status: Hardware. References: 273 . Comments: Originally the first stage of the Proton was designed for 4 x fixed 11D43 and 4 x gimballed Kosberg 8D43 (see separate entries for each engine for details of those engines). This configuration was replaced by 6 x 11D48 from Glushko.
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Last update 12 March 2001.
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