R-7 Semyorka
(Credit: Mark Wade)
R-7 Semyorka
(Credit: Mark Wade)
The R-7 missile was developed as the Soviet Union's first ICBM. It was, in fact, the first ICBM in the world. Its usefulness as a weapons platform was somewhat short lived, but the R-7 has evolved into superbly useful launch vehicle. The R-7 and its derivatives have launched Sputnik (the world's first satellite), all the Vostok, Voskhod, and Soyuz manned missions, Progress cargo missions, commercial satellites, biological research satellites, observation satellites, and more.
A Soviet governmental order on 13 February 1953 called for a two-stage intercontinental ballistic missile with a range of 7000-8000 km and nose cone plus payload (warhead) capacity of 3 tons. Shortly after initial testing in October 1953, the design was modified and called for a payload capacity of 3 tons and a launch weight increase from 170 tons to 280 tons.
Flight testing of the 8K71 began on 15 May 1957. Among the first seven tests of the R-7 were the launch of Sputnik 1 (4 October 1957) and Sputnik 2 (3 November 1957), which carried the dog Laika.
A ministerial decree on 2 July 1958 called for an upgraded R-7, the R-7A (8K74). This variation had more powerful engines, a lighter warhead, and increased propellant mass which increased the range up to 12,000 km. The R-7A went on active alert in early 1960. Normal reaction time under normal conditions was about 10 hours, and hold time (because of the cryogenic oxidizer) was about 1 hour. By mid-1968, the R-7A had been phased out of operational inventory and is now used exclusively for space applications.
A direct derivative of the R-7, the Vostok (8K72K) (US designation, SL-2) was used for all six manned Vostok missions. The 11A57 (Voskhod) was used for Voskhod 1 and 2. The Soyuz (11A511), Soyuz-U (11A511U, 11A5611U2), Soyuz FG (11A511U-FG), and Soyuz-2.1a (14A14) ave been used for flights since Komarov's Soyuz 1 flight. Progress cargo flights have also used these vehicles. The Soyuz U was retired after 22 February 2017, and the Soyuz FG was retired after 25 September 2019. The Soyuz-2 is the most current, in use (for Soyuz/Progress) since Progress M-25M in October 2014.
Drawing in public domain
NOTE: The R-7 is also referred to as the SS-6 by the United States Defense Intelligence Agency, and as Sapwood by NATO.
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Last updated: 06 November 2023 19:25:28.
