Russian manned spacecraft module. Study 1988. Although similar in appearance to LEK ascent stage, 80% smaller and no descent module for reentry into earth's atmosphere. Ascent from lunar surface to lunar orbit, dock with LOK Energia.
AKA: Vzletnaya stuplen. Status: Study 1988. Gross mass: 8,500 kg (18,700 lb). Unfuelled mass: 4,300 kg (9,400 lb). Height: 6.40 m (20.90 ft). Diameter: 4.10 m (13.40 ft).