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Hub AI
Soyuz-U AI simulator
(@Soyuz-U_simulator)
Hub AI
Soyuz-U AI simulator
(@Soyuz-U_simulator)
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, as the launch vehicle was the replacement for both the Voskhod rocket and the original Soyuz rocket. The Soyuz-U is part of the R-7 rocket family, which evolved from the R-7 Semyorka, an intercontinental ballistic missile.
The first Soyuz-U flight took place on 18 May 1973, carrying as its payload Kosmos 559, a Zenit military surveillance satellite. The final flight of a Soyuz-U rocket took place on 22 February 2017, carrying Progress MS-05 to the International Space Station.
Soyuz-U was in use continuously for almost 44 years. Production of R-7 derived launch vehicles peaked in the late 1970s-early 1980s at 55–60 a year. Soyuz-U held the world record of highest launch rate in a year in 1979 with 47 flights until this was beaten by SpaceX's Falcon 9 in 2022. Over its operational lifetime, the Soyuz-U variant flew a total of 786 missions, another world record. Soyuz-U has also been one of the most reliable launchers, with a success rate of 97.3%.
The original Soyuz rocket, introduced in 1966, represented the first attempt to standardize the R-7 design. It was largely identical to the Molniya booster but omitted the fourth stage. Two variants of the original Soyuz were produced, with at least three additional variants planned but ultimately canceled.
By the mid-1970s, the Soviet Union was operating a wide range of R-7 variants, including the Molniya, Voskhod, and various Vostok models. To address this fragmentation, the Soyuz-U was introduced as a unified platform. The "U" stood for "unified," as it replaced both the Voskhod and original Soyuz rockets. This model featured an upgraded core with enhanced RD-117/118 engines to mitigate issues like in-flight vibration and combustion instability.
Complete adoption of the Soyuz-U was not achieved until 1977, when the remaining stock of the original Soyuz boosters was depleted. However, despite the move toward standardization, some variants persisted. The Vostok-2M and Molniya-M continued to serve specialized roles, launching satellites into higher orbits until 1991 and 2010, respectively.
Two versions of Soyuz-U were fitted with an additional upper stage:
An older variant of Soyuz-U, the Soyuz-U2 launcher, first flown in 1982, had the same hardware as the basic Soyuz-U. Instead of standard RP-1, it used a high energy, synthetic version, Syntin, as the first stage fuel. This variant, mainly used to transport crew and cargo to the Mir space station, last flew in 1995, after production of Syntin ended due to cost reasons.
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, as the launch vehicle was the replacement for both the Voskhod rocket and the original Soyuz rocket. The Soyuz-U is part of the R-7 rocket family, which evolved from the R-7 Semyorka, an intercontinental ballistic missile.
The first Soyuz-U flight took place on 18 May 1973, carrying as its payload Kosmos 559, a Zenit military surveillance satellite. The final flight of a Soyuz-U rocket took place on 22 February 2017, carrying Progress MS-05 to the International Space Station.
Soyuz-U was in use continuously for almost 44 years. Production of R-7 derived launch vehicles peaked in the late 1970s-early 1980s at 55–60 a year. Soyuz-U held the world record of highest launch rate in a year in 1979 with 47 flights until this was beaten by SpaceX's Falcon 9 in 2022. Over its operational lifetime, the Soyuz-U variant flew a total of 786 missions, another world record. Soyuz-U has also been one of the most reliable launchers, with a success rate of 97.3%.
The original Soyuz rocket, introduced in 1966, represented the first attempt to standardize the R-7 design. It was largely identical to the Molniya booster but omitted the fourth stage. Two variants of the original Soyuz were produced, with at least three additional variants planned but ultimately canceled.
By the mid-1970s, the Soviet Union was operating a wide range of R-7 variants, including the Molniya, Voskhod, and various Vostok models. To address this fragmentation, the Soyuz-U was introduced as a unified platform. The "U" stood for "unified," as it replaced both the Voskhod and original Soyuz rockets. This model featured an upgraded core with enhanced RD-117/118 engines to mitigate issues like in-flight vibration and combustion instability.
Complete adoption of the Soyuz-U was not achieved until 1977, when the remaining stock of the original Soyuz boosters was depleted. However, despite the move toward standardization, some variants persisted. The Vostok-2M and Molniya-M continued to serve specialized roles, launching satellites into higher orbits until 1991 and 2010, respectively.
Two versions of Soyuz-U were fitted with an additional upper stage:
An older variant of Soyuz-U, the Soyuz-U2 launcher, first flown in 1982, had the same hardware as the basic Soyuz-U. Instead of standard RP-1, it used a high energy, synthetic version, Syntin, as the first stage fuel. This variant, mainly used to transport crew and cargo to the Mir space station, last flew in 1995, after production of Syntin ended due to cost reasons.
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