R-56 Block A R- 56 Stage 1 Gross Mass: 1,162,000 kg (2,561,000 lb). Empty Mass: 162,000 kg (357,000 lb). Thrust (vac): 1,608.000 kN (361,492 lbf). Isp: 316 sec. Burn time: 120 sec. Propellants: N2O4/UDMH. Isp(sl): 285 sec. Diameter: 6.50 m (21.30 ft). Span: 8.20 m (26.90 ft). Length: 36.00 m (118.00 ft). Country: Ukraine. No Engines: 16. Engine: RD-253-11D48. 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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