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Proton K-4H
Proposed LF2/Ammonia propellant Proton K fourth stage. Not put into production due to volatility of oxidizer.

Status: Development 1992.. Thrust: 98.00 kN (22,031 lbf). Gross mass: 21,700 kg (47,800 lb). Unfuelled mass: 3,000 kg (6,600 lb). Specific impulse: 401 s. Specific impulse sea level: 80 s. Burn time: 750 s. Height: 6.00 m (19.60 ft). Diameter: 4.00 m (13.10 ft). Span: 4.00 m (13.10 ft).

Cost $ : 20.000 million.



Family: Space Tugs. Country: Russia. Engines: RD-301. Propellants: LF2/Ammonia.

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