LOx/Kerosene propellant rocket stage. Orbital MIRV stage. Six of these stages clustered around Block B; each stage would have had a 1500 kg nuclear warhead.
Status: Study 1962. Thrust: 88.20 kN (19,828 lbf). Gross mass: 8,200 kg (18,000 lb). Unfuelled mass: 1,700 kg (3,700 lb). Specific impulse: 346 s. Burn time: 246 s. Height: 5.00 m (16.40 ft). Diameter: 2.40 m (7.80 ft). Span: 2.40 m (7.80 ft).