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Polyblock UR-500-1P
RD-253 engine
RD-253 engine
Credit: Khrunichev
N2O4/UDMH propellant rocket stage. Original 'Polyblock' design for Proton first stage. This was selected configuration; although somewhat greater in dry mass, it had the advantages of shorter length.

AKA: UR-500 Polyblock Stage 1P. Status: Design 1962. Thrust: 8,989.70 kN (2,020,965 lbf). Gross mass: 378,900 kg (835,300 lb). Unfuelled mass: 26,900 kg (59,300 lb). Specific impulse: 310 s. Specific impulse sea level: 280 s. Burn time: 119 s. Height: 21.20 m (69.50 ft). Diameter: 4.10 m (13.40 ft). Span: 7.40 m (24.20 ft).

No Engines: 4.



Subtopics

Monoblock UR-500-1M N2O4/UDMH propellant rocket stage. Original conventional 'Monoblock' design for Proton first stage.

Proton K-1 Proton K stage 1.

UR-500MK-1 LOx/Kerosene propellant rocket stage. Empty mass estimated based on overall vehicle mass fraction. Length estimated based on total mass.

Proton M-1 Proton M Stage 1.

Country: Russia. Engines: 8D43 + 11D43, 11D43. Launch Vehicles: Polyblock UR-500. Propellants: N2O4/UDMH.

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