R-56 Block B R- 56 Stage 2 Gross Mass: 213,000 kg (469,000 lb). Empty Mass: 13,000 kg (28,000 lb). Thrust (vac): 1,980.000 kN (445,120 lbf). Isp: 325 sec. Burn time: 370 sec. Propellants: N2O4/UDMH. Diameter: 6.50 m (21.30 ft). Span: 6.50 m (21.30 ft). Length: 12.00 m (39.00 ft). Country: Ukraine. No Engines: 1. Engine: RD-254. Status: Study 1961. Used on Launch Vehicles: R-56.                   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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