Proton KM-4 KVRB stage Credit - © Mark Wade Media Gallery Gross Mass: 19,500 kg (42,900 lb). Empty Mass: 3,000 kg (6,600 lb). Thrust (vac): 73.579 kN (16,541 lbf). Isp: 461 sec. Burn time: 780 sec. Propellants: Lox/LH2. Diameter: 3.80 m (12.40 ft). Span: 3.80 m (12.40 ft). Length: 7.00 m (22.90 ft). Country: Russia. No Engines: 1. Engine: RD-56M. Status: Development 1992. Cost $ : 30.000 million. First Flight: 1995.                   Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2007 except where otherwise noted.

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