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Monoblock UR-500-3
N2O4/UDMH propellant rocket stage. Original Proton third stage design.

AKA: UR-500 Stage 3. Status: Design 1962. Thrust: 613.11 kN (137,833 lbf). Gross mass: 23,940 kg (52,770 lb). Unfuelled mass: 2,180 kg (4,800 lb). Specific impulse: 320 s. Burn time: 110 s. Height: 3.70 m (12.10 ft). Diameter: 4.10 m (13.40 ft). Span: 4.10 m (13.40 ft).

Subtopics
Proton K-3 Proton K stage 3.
Proton M-3 Proton M Stage 3.
Country: Russia. Engines: RD-0212. Launch Vehicles: Monoblock UR-500, Polyblock UR-500. Propellants: N2O4/UDMH.
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