This page no longer updated from 31 October 2001. Latest version can be found at UR-500 Stage 2

Gross Mass: 137,700 kg. Empty Mass: 16,000 kg. Thrust (vac): 324,600 kgf. Isp: 320 sec. Burn time: 119 sec. Propellants: N2O4/UDMH Diameter: 4.1 m. Span: 4.1 m. Length: 10.9 m. Country: USSR. No Engines: 4. RD-0213 Status: Study 1962. Comments: Original Proton second stage design.
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Last update 12 March 2001.
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© Mark Wade, 2001 .