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"The creation of a permanent heavy manned multi-purpose orbital station will be a qualitatively new step in space exploration and will be a priority.

3. Reusable transport space system (MTKS), two-1800 stage, height 67.5 m, launch weight 2800 tons.

Two RLA-120 modular first stages serve as the disposable first stage. An oxygen-hydrogen unit of the second stage of the carrier is being developed. Maximum carrying capacity of the carrier is 150 tons to northeasterm low reference orbit.

The reusable transport space plane has a maximum payload capacity of up to 40 tons to the northeastern low reference orbit, up to 23 tons to the synchronous solar orbit, or a lower payload capacity to correspondingly higher orbits. Mass of cargo returned from space to Earth up to 20 tons.

First, an analogue of a reusable space plane weighing 15-25 tons is created, launched into orbit using the RLA-120. This manned analogue is used to test the main adopted design and material solutions, which makes it possible to manufacture a full-size aircraft with a carrier in 1984. In addition, this analogue will be suitable for independent operation as a reusable light-class space aircraft.

The MTKS is operated in conjunction with an interorbital tug, created on the basis of the 11S86 (DM) block with extended tanks and systems for refueling, rendezvous and docking with payload installed. With one tank refill, this inter-orbital tug weighing 29 tons is capable of transporting a 25-ton load 7 times from a low reference orbit to a circular altitude of 400 km. As the second stage of MTKS, the program provides for the creation in 1985-90 of a [cont. next page: reusable flyback first stage, which will replace the expendable first stage.]"

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