This page no longer updated from 31 October 2001. Latest version can be found at UR-500 Monoblok Stage 1M

Gross Mass: 367,360 kg. Empty Mass: 25,560 kg. Thrust (vac): 916,700 kgf. Isp: 310 sec. Burn time: 115 sec. Propellants: N2O4/UDMH Isp(sl): 280 sec. Diameter: 6.2 m. Span: 6.2 m. Length: 30.0 m. Country: USSR. No Engines: 4. 8D43 + 11D43 Status: Study 1962. Comments: Original conventional 'Monoblock' design for Proton first stage.
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Last update 12 March 2001.
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© Mark Wade, 2001 .