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Proton KM-4
Part of N1 Block R Family
LOx/LH2 propellant rocket stage. Planned version for Proton. Never developed.

Status: Development 1992.. Thrust: 73.58 kN (16,541 lbf). Gross mass: 19,500 kg (42,900 lb). Unfuelled mass: 3,000 kg (6,600 lb). Specific impulse: 461 s. Burn time: 780 s. Height: 7.00 m (22.90 ft). Diameter: 3.80 m (12.40 ft). Span: 3.80 m (12.40 ft).

Cost $ : 30.000 million.



Country: Russia. Engines: RD-56M, RD-0225. Propellants: Lox/LH2.

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