This page no longer updated from 31 October 2001. Latest version can be found at Proton K-4H

Gross Mass: 21,700 kg. Empty Mass: 3,000 kg. Thrust (vac): 10,000 kgf. Isp: 401 sec. Burn time: 750 sec. Propellants: LF2/Ammonia Isp(sl): 80 sec. Diameter: 4.0 m. Span: 4.0 m. Length: 6.0 m. Country: Russia. No Engines: 1. RD-301 Status: Development.
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Last update 12 March 2001.
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© Mark Wade, 2001 .