This page no longer updated from 31 October 2001. Latest version can be found at UR-700-3

Gross Mass: 399,400 kg. Empty Mass: 26,000 kg. Thrust (vac): 524,100 kgf. Isp: 328 sec. Burn time: 225 sec. Propellants: N2O4/UDMH Diameter: 4.2 m. Span: 7.5 m. Length: 20.8 m. Country: Russia. No Engines: 3. RD-254 Status: Development 1967.
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Last update 12 March 2001.
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© Mark Wade, 2001 .