Russian manned spacecraft module. Study 1968. Differed from the lateral Block 1 stages in having an engine unit for orientation of the assembly. Main engine of 23,500 kgf and three engines for soft landing / midcourse maneuvers of 1,670 kgf each. Midcourse man oeuvre/lunar braking stage.
AKA: Block 11. Status: Study 1968. Thrust: 279.58 kN (62,852 lbf). Gross mass: 32,226 kg (71,046 lb). Specific impulse: 326 s.