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R- 56 Stage 3
Model: R-56 Block O. Gross Mass: 32,000 kg (70,000 lb). Empty Mass: 2,000 kg (4,400 lb). Thrust (vac): 544.200 kN (122,341 lbf). Isp: 327 sec. Burn time: 190 sec. Propellants: N2O4/UDMH. Diameter: 4.00 m (13.10 ft). Span: 4.00 m (13.10 ft). Length: 7.00 m (22.90 ft). Country: Ukraine. No Engines: 1. Motor: RD-0213. Status: Study 1961. Other designations: Orbital Block.

Empty mass estimated (rounded figures given in source material indicates impossible 31 tonnes gross with 30 tonnes propellant).

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