AKA: Mu-4S-4. Status: Retired 1972. Thrust: 26.50 kN (5,957 lbf). Gross mass: 400 kg (880 lb). Unfuelled mass: 73 kg (160 lb). Burn time: 40 s. Height: 1.80 m (5.90 ft). Diameter: 0.79 m (2.59 ft).