The Soyuz-U2 (

GRAU index The Main Missile and Artillery Directorate of the Ministry of Defense of the Russian Federation (), commonly referred to by its transliterated acronym GRAU (), is a department of the Russian Ministry of Defense. It is subordinate to the Chief of ...

11A511U2) was a

Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

, later Russian,

carrier rocket A launch vehicle is typically a rocket-powered vehicle designed to carry a payload (a crewed spacecraft or satellites) from Earth's surface or lower atmosphere to outer space. The most common form is the ballistic missile-shaped multistag ...

. It was derived from the

Soyuz-U Soyuz-U ( GRAU index: 11A511U) was a Soviet and later Russian expendable medium-lift launch vehicle designed by the TsSKB design bureau and constructed at the Progress factory in Samara, Russia. The ''U'' designation stands for ''unified' ...

, and a member of the R-7 family of rockets. It featured increased performance compared with the baseline Soyuz-U, due to the use of

syntin Syntin is a hydrocarbon with the molecular formula C10H16 used as a rocket fuel. It is a mixture of four Stereoisomerism, stereoisomers (see below). It has a density of 0.851 g/mL, and a boiling point of 158 °C. Due to the presence of thre ...

propellant, as opposed to

RP-1 RP-1 (Rocket Propellant-1 or Refined Petroleum-1) and similar fuels like RG-1 and T-1 are highly refined kerosene formulations used as rocket fuel. Liquid-fueled rockets that use RP-1 as fuel are known as kerolox rockets. In their engines, RP- ...

paraffin, used on the Soyuz-U. The increased payload of the Soyuz-U2 allowed heavier spacecraft to be launched, while lighter spacecraft could be placed in higher

orbit In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an ...

s, compared to those launched by Soyuz-U rockets. In 1996, it was announced that the Soyuz-U2 had been retired, as the performance advantage gained through the use of syntin did not justify the additional cost of its production. The final flight, Soyuz TM-22, occurred on 3 September 1995 from

Gagarin's Start Gagarin's Start (, ''Gagarinskiy start''), also known as Baikonur Site 1 or Site 1/5 was a launch site at the Baikonur Cosmodrome in Kazakhstan that was used by the Soviet space program and Roscosmos. History 20th century The launchpad f ...

Baikonur Baikonur ( ; ) is a city in Kazakhstan on the northern bank of the Syr Darya river. It is currently leased and administered by the Russian Federation as an enclave until 2050. It was constructed to serve the Baikonur Cosmodrome with adminis ...

. The Soyuz-U2 was first used to launch four Zenit

reconnaissance satellite A reconnaissance satellite or intelligence satellite (commonly, although unofficially, referred to as a spy satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications. The ...

s, then it delivered crewed

Soyuz spacecraft Soyuz () is a series of spacecraft which has been in service since the 1960s, having made more than 140 flights. It was designed for the Soviet space program by the Korolev Design Bureau (now Energia). The Soyuz succeeded the Voskhod spacecraf ...

to space stations

Salyut 7 Salyut 7 (), also known as DOS-6 (Durable Orbital Station 6) was a space station in low Earth orbit from April 1982 to February 1991. It was first crewed in May 1982 with two crew via Soyuz T-5, and last visited in June 1986, by Soyuz T-15. Va ...

and

Mir ''Mir'' (, ; ) was a space station operated in low Earth orbit from 1986 to 2001, first by the Soviet Union and later by the Russia, Russian Federation. ''Mir'' was the first modular space station and was assembled in orbit from 1986 to ...

: missions

Soyuz T-12 Soyuz T-12 (also known as Salyut 7 EP-4) was the seventh crewed spaceflight to the Soviet space station Salyut 7. The name "Soyuz T-12" is also the name of the spacecraft used to launch and land the mission's three-person crew. The mission occurr ...

to T-15 and

Soyuz TM-1 Soyuz TM-1 was an unmanned test flight of the Soyuz-TM spacecraft, intended for use in the Mir space station program. This was the maiden flight of the Soyuz-TM spacecraft, intended as the successor to the Soyuz-T spacecraft used in the Salyut ...

to TM-22. It also supplied the stations with

Progress Progress is movement towards a perceived refined, improved, or otherwise desired state. It is central to the philosophy of progressivism, which interprets progress as the set of advancements in technology, science, and social organization effic ...

cargo spacecraft: Progress 20 to Salyut 7,

Progress 25 Progress 25 () was a Soviet uncrewed Progress cargo spacecraft, which was launched in March 1986 to resupply the Mir space station. Launch Progress 25 launched on 19 March 1986 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U ...

to 42 to Mir, followed by the new generation Progress M-1 to M-18 and finally M-23. Other missions included the Gamma telescope and three Orlets reconnaissance satellites. In total, Soyuz-U2 was launched 72 times and experienced no failures over its operational lifetime.

References

R-7 (rocket family) Space launch vehicles of the Soviet Union Space launch vehicles of Russia Soyuz program Vehicles introduced in 1982 {{rocketry-stub

See also

References