Russian manned spacecraft module. Study 1968. Main engine of 13,400 kgf and three engines for soft landing / midcourse maneuvers of 1,670 kgf each. Trans-earth injection / midcourse man oeuvre stage.
AKA: Block 1V. Status: Study 1968. Thrust: 180.54 kN (40,587 lbf). Gross mass: 11,670 kg (25,720 lb). Unfuelled mass: 2,675 kg (5,897 lb).