TMK

The first flight to Mars of the TMK-1 was planned to begin on June 8, 1971.

The 75 metric ton TMK-1 spacecraft would take a crew of three on a Mars flyby mission. After a 10½ month flight the crew would race past Mars, dropping remote-controlled landers, and then be flung into an Earth-return trajectory. Earth return would happen on July 10, 1974, after a voyage of three years, one month, and two days.

Spacecraft configuration: *A ''habitation'' or ''pilot compartment'', with an internal volume of 25 cubic meters *A ''work'' or ''equipment section'', including the hatch for extra-vehicular activities and a solar storm shelter should solar flares increase radiation to dangerous levels. Total volume of the section would be 25 cubic meters *A ''biological systems compartment'', with the SOZh closed-cycle environmental control system, with a total volume of 75 cubic meters *An ''aggregate section'', with the Mars probe capsules, the KDU midcourse correction engine, the SOZh solar concentrator and solar panels, and radio antennas * The ''SA'' crew Earth reentry capsule, about 4 m in diameter. Provided by Wikipedia