AKA: Proton KM-3. Status: Active. Thrust: 613.80 kN (137,988 lbf). Gross mass: 50,300 kg (110,800 lb). Unfuelled mass: 3,700 kg (8,100 lb). Specific impulse: 327 s. Burn time: 230 s. Height: 6.90 m (22.60 ft). Diameter: 4.15 m (13.61 ft). Span: 4.15 m (13.61 ft).