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The R-7 (Russian : Р-7) family of rockets is a series of rockets, derived from the Soviet R-7 Semyorka, the world's first intercontinental ballistic missile (ICBM). More R-7 rockets have been launched than any other family of large rockets.
Contents
- Summary of variants
- Korolev Cross
- See also
- References
- External links
Under the direction of the rocket pioneer Sergey Korolyov, the Soviet Union during the 1950s developed an ICBM that was capable of delivering a heavy nuclear weapon to American targets. That ICBM, called the R-7 or Semyorka ("Number 7"), was first successfully tested on August 21, 1957. Because Soviet nuclear warheads were based on a heavy design, the R-7 had significantly greater weight-lifting capability than did initial U.S. ICBMs. When used as a space launch vehicle, this gave the Soviet Union a significant early advantage in the weight that could be placed in orbit or sent to the Moon or nearby planets. There have been a number of variants of the R-7 with an upper stage, each with a different name, usually matching that of the payload, and each optimized to carry out specific missions. An unmodified R-7 was used to launch the first Soviet satellite, Sputnik 1, on October 4, 1957, and an R-7 variant, the Vostok, launched the first Soviet cosmonauts, among them Yuri Gagarin, who on April 12, 1961, became the first human to orbit Earth. Other variants include the Voshkod, used to launch reconnaissance satellites, and the Molniya, used to launch communications satellites. A multipurpose variant, the Soyuz, was first used in 1966 and, with many subsequent variants and improvements, is still in service. This family of launch vehicles has carried out more space launches than the rest of the world's launch vehicles combined.
When Soviet nuclear warheads became lighter, the R-7 turned out to be impractical as a ballistic missile, and there were no other heavy payloads with a military application. However, long-term development has made the rockets useful in the Soviet, and later, Russian space programmes. Their purpose shifted primarily to launching satellites, probes, crewed and uncrewed spacecraft, and other non-threatening payloads. The R-7 family consists of both missiles and orbital carrier rockets. Derivatives include the Vostok, Voskhod and Soyuz rockets, which as of 2022 have been used for all Soviet, and later Russian human spaceflights. The type has a unique configuration where four break-away liquid-fueled engines surround a central core. The core acts as, in effect, a "second stage" after the other four engines are jettisoned. These rockets are expendable.
Later modifications were standardised around the Soyuz design. The Soyuz-2 is currently in use.
The Soyuz-FG was retired in 2019 in favour of the Soyuz-2.1a. [1] R-7 rockets are launched from the Baikonur Cosmodrome, Plesetsk Cosmodrome, Guiana Space Centre (from 2011 to 2022, see Soyuz at the Guiana Space Centre), and the Vostochny Cosmodrome (first launch 2016).
Summary of variants
All the R-7 family rockets are listed here by date of introduction. Most of the early R-7 variants have been retired. Active versions (as of 2022) are shown in green.
| Name | GRAU index | Function | N° Core Stages [lower-alpha 1] | Maiden flight | Final flight | Launches [lower-alpha 2] | Remarks | ||
|---|---|---|---|---|---|---|---|---|---|
| Total | Success | Failure (+ partial) | |||||||
| R-7 Semyorka | 8K71 | ICBM | 1 | 15 May 1957 | 27 February 1961 | 27 | 18 | 9 | World's first ICBM |
| Sputnik-PS | 8K71PS | Carrier rocket | 1 | 4 October 1957 | 3 November 1957 | 2 | 2 | 0 | World's first carrier rocket Launched Sputnik 1 and Sputnik 2 |
| Sputnik | 8A91 | Carrier rocket | 1 | 27 April 1958 | 15 May 1958 | 2 | 1 | 1 | Launched Sputnik 3 |
| Luna | 8K72 | Carrier rocket | 2 | 23 September 1958 | 16 April 1960 | 9 | 2 | 7 | Launched first Lunar probes |
| R-7A Semyorka | 8K74 | ICBM | 1 | 23 December 1959 | 25 July 1967 | 21 | 18 | 3 | The only operational ICBM version. Improved range and guidance system. Only 6 launch positions were available. Used as a base for 11A57 and later mods |
| Vostok-L | 8K72L | Carrier rocket | 2 | 15 May 1960 | 1 December 1960 | 4 | 3 | 1 | Variant of Luna, used to launch prototype Vostok spacecraft |
| Molniya | 8K78 | Carrier rocket | 3 | 20 January 1960 | 3 December 1965 | 26 | 12 | 14 | Designed to send payloads out of LEO |
| Vostok-K | 8K72K | Carrier rocket | 2 | 22 December 1960 | 10 July 1964 | 13 | 11 | 2 | Used for crewed Vostok missions First rocket to launch a man into space |
| Molniya-L | 8K78L | Carrier rocket | 3 | Unbuilt | |||||
| Vostok-2 | 8A92 | Carrier rocket | 2 | 1 June 1962 | 12 May 1967 | 45 | 40 | 5 | Used for launching Zenit reconnaissance satellites throughout the 1960s |
| Polyot | 11A59 | Carrier rocket | 1 | 1 November 1963 | 12 April 1964 | 2 | 2 | 0 | |
| Voskhod | 11A57 | Carrier rocket | 2 | 16 November 1963 | 29 June 1976 | 300 | 277 | 23 | Launched crewed Voskhod 1 and Voskhod 2 missions |
| Molniya-M | 8K78M | Carrier rocket | 3 | 19 February 1964 | 30 September 2010 [2] | 297 | 276 | 21 | Improved version of Molniya |
| Vostok-2M | 8A92M | Carrier rocket | 2 | 28 August 1964 | 29 August 1991 | 94 | 92 | 2 | Modified version for launching Meteor weather satellites into higher orbits |
| Soyuz/Vostok | 11A510 | Carrier rocket | 3 | 27 December 1965 | 20 July 1966 | 2 | 2 | 0 | Launched with prototype US-A satellites |
| Soyuz | 11A511 | Carrier rocket | 2 | 28 November 1966 | 24 May 1975 | 30 | 28 | 2 | Launched several crewed Soyuz missions |
| Soyuz-B | 11K55 | Carrier rocket | 2 | Unbuilt | |||||
| Soyuz-V | 11K56 | Carrier rocket | 2 | Unbuilt | |||||
| Soyuz-R | 11A514 | Carrier rocket | 2 | Unbuilt | |||||
| Soyuz-L | 11A511L | Carrier rocket | 2 | 24 November 1970 | 12 August 1971 | 3 | 3 | 0 | Created to test the LK lunar lander in LEO |
| Soyuz-M | 11A511M | Carrier rocket | 2 | 27 December 1971 | 31 March 1976 | 8 | 8 | 0 | Built to launch crewed Soyuz 7K-VI spacecraft, eventually used to launch reconnaissance satellites |
| Soyuz-U | 11A511U | Carrier rocket | 2 or 3 | 18 May 1973 | 22 February 2017 | 786 | 765 | 22 [3] | Single most launched carrier rocket ever built Used for a number of crewed Soyuz launches |
| Soyuz-U2 | 11A511U2 | Carrier rocket | 2 | 23 December 1982 | 3 September 1995 | 72 | 72 | 0 | Used for a number of crewed Soyuz launches |
| Soyuz-FG | 11A511U-FG | Carrier rocket | 2 or 3 | 20 May 2001 | 25 September 2019 | 70 | 69 | 1 | Used for crewed Soyuz launches, the final launch was the Soyuz MS-15 on 25 September 2019. |
| Soyuz-2.1a / STA | 14A14A | Carrier rocket | 2 or 3 | 8 November 2004 | Active | 64 | 61 | 2+1p | Used for crewed Soyuz launches from Soyuz MS-16 on 9 April 2020. In August 2019 the booster lofted the uncrewed Soyuz MS-14 into orbit in order to test the spacecraft on the new rocket. |
| Soyuz-2.1b / STB | 14A14B | Carrier rocket | 2 or 3 | 27 December 2006 | Active | 79 | 76 | 2+1p | |
| Soyuz-2-1v | 14A15 | Carrier rocket | 2 | 28 December 2013 | Active | 9 | 8 | 1p | 1st stage uses a completely new design utilizing surplus NK-33 engines from the Moon N-1 launcher and no boosters. |
| |||||||||
Korolev Cross
The Korolev Cross is a visual phenomenon observed in the smoke plumes of the R-7 series rockets during separation of the four liquid-fueled booster rockets attached to the core stage. [4] As the boosters fall away from the rocket, they pitch over symmetrically due to aerodynamic forces acting upon them, forming a cross-like shape behind the rocket. The effect is named after Sergei Korolev, the designer of the R-7 rocket. When the rocket is launched into clear skies, the effect can be seen from the ground at the launch site.
See also
- 1957 in spaceflight
- List of R-7 launches
- Comparison of orbital launchers families
- Soviet rocketry
Related Research Articles
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Soyuz is a family of expendable Russian and Soviet carrier rockets developed by OKB-1 and manufactured by Progress Rocket Space Centre in Samara, Russia. The Soyuz is the rocket with the most launches in the history of spaceflight.
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The R-7 Semyorka, officially the GRAU index 8K71, was a Soviet missile developed during the Cold War, and the world's first intercontinental ballistic missile. The R-7 made 28 launches between 1957 and 1961. A derivative, the R-7A, was operational from 1960 to 1968. To the West it was unknown until its launch. In modified form, it launched Sputnik 1, the first artificial satellite, into orbit, and became the basis for the R-7 family which includes Sputnik, Luna, Molniya, Vostok, and Voskhod space launchers, as well as later Soyuz variants. Various modifications are still in use and it has become the world’s most reliable space launcher.
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Vostok was a family of rockets derived from the Soviet R-7 Semyorka ICBM and was designed for the human spaceflight programme. This family of rockets launched the first artificial satellite and the first crewed spacecraft (Vostok) in human history. It was a subset of the R-7 family of rockets.
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