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R- 56 Stage 4
Model: R-56 Block K. Gross Mass: 9,400 kg (20,700 lb). Empty Mass: 700 kg (1,540 lb). Thrust (vac): 117.000 kN (26,302 lbf). Isp: 350 sec. Burn time: 350 sec. Propellants: N2O4/Aerozine-50. Diameter: 4.00 m (13.10 ft). Span: 4.00 m (13.10 ft). Length: 5.00 m (16.40 ft). Country: Ukraine. No Engines: 1. Motor: RD-280. Status: Study 1961. Other designations: Space Block.

Empty mass estimated (rounded figures given in source material indicates impossible 9 tonnes gross with 8.7 tonnes propellant).

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