AKA: UR-500 Stage 2. Status: Design 1962. Thrust: 3,183.20 kN (715,612 lbf). Gross mass: 137,700 kg (303,500 lb). Unfuelled mass: 16,000 kg (35,000 lb). Specific impulse: 320 s. Burn time: 119 s. Height: 10.90 m (35.70 ft). Diameter: 4.10 m (13.40 ft). Span: 4.10 m (13.40 ft).
No Engines: 4.
|UR-500-2 N2O4/UDMH propellant rocket stage. Proton UR-500 second stage. Flew only on two-stage version of Proton. Empty mass is correct; all other values estimated based on UR-500 Stage 2 original design and UR-500K stage 2 figures.|
|Proton K-2 Proton K stage 2.|
|UR-500MK-2 LOx/Kerosene propellant rocket stage. Empty mass estimated based on overall vehicle mass fraction. Length estimated based on total mass.|