TheLong March rockets are a family ofexpendable launch systemrockets operated by theChina Aerospace Science and Technology Corporation.[1][2] The rockets are named after theChinese Red Army's 1934–35Long March military retreat during theChinese Civil War.[3]
The Long March series has performed more than 500 launches, including missions tolow Earth orbit,Sun-synchronous orbit, geostationary transfer orbit, and Earth-Moon transfer orbit. The new-generation carrier rockets, Long March 5, Long March 6, Long March 7, Long March 11, and Long March 8, have made their maiden flights. Among them, the Long March 5 has a low-Earth orbit carrying capacity of 25,000 kilograms, and a geosynchronous transfer orbit carrying capacity of 14,000 kilograms.[1][2]
China used theLong March 1 rocket to launch its firstsatellite,Dong Fang Hong 1 (lit. "The East is Red 1"), intolow Earth orbit on 24 April 1970, becoming the fifth nation to achieve independent launch capability. Early launches had an inconsistent record, focusing on the launching of Chinese satellites. TheLong March 1 was quickly replaced by theLong March 2 family of launchers.
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TheLong March 1 rocket is derived from earlier Chinese 2-stageIntermediate-range ballistic missile (IRBM)DF-4, orDong Feng 4 missile, and theLong March 2,Long March 3,Long March 4 rocket families are derivatives of the Chinese 2-stageIntercontinental ballistic missile (ICBM)DF-5, orDong Feng 5 missile.
However, like its counterparts in both the United States and in Russia, the differing needs of space rockets and strategic missiles have caused the development of space rockets and missiles to diverge. The main goal of alaunch vehicle is to maximize payload, while for strategic missiles increased throw weight is much less important than the ability to launch quickly and to survive afirst strike. This divergence has become clear in the next generation of Long March rockets, which usecryogenic propellants in sharp contrast to the next generation of strategic missiles, which are mobile andsolid fuelled.
The next generation of Long March rocket,Long March 5 rocket family, is a brand new design, whileLong March 6 andLong March 7 can be seen as derivations because they use theliquid rocket booster design ofLong March 5 to build small-to-mid capacity launch vehicles.
After theU.S. Space ShuttleChallenger was destroyed in 1986, a growing commercial backlog gave China the chance to enter the international launch market. In September 1988,U.S. PresidentRonald Reagan agreed to allow U.S. satellites to be launched on Chinese rockets.[4] Reagan's satellite export policy would continue to 1998, through Bush and Clinton administrations, with 20 or more approvals.[5]AsiaSat 1, which had originally been launched by the Space Shuttle and retrieved by another Space Shuttle after a failure, was launched by aLong March 3 in 1990 as the first foreign payload on a Chinese rocket.
However, major setbacks occurred in 1992–1996. TheLong March 2E was designed with a defective payload fairing, which collapsed when faced with the rocket's excessive vibration. After just seven launches, the Long March 2E destroyed theOptus B2 andApstar 2 satellites and damagedAsiaSat 2.[6][7] TheLong March 3B also experienced a catastrophic failure in 1996, veering off course shortly after liftoff and crashing into a nearby village. At least 6 people were killed on the ground, and theIntelsat 708 satellite was also destroyed.[8] ALong March 3 also experienced a partial failure in August 1996 during the launch ofChinasat-7.[9] Six Long March rockets (Chang Zheng 2C/SD) launched 12Iridium satellites, about a sixth of Iridium satellites in the original fleet.[10]
The involvement of United States companies in theApstar 2 andIntelsat 708 investigations caused great controversy in the United States. In theCox Report, theUnited States Congress accusedSpace Systems/Loral andHughes Aircraft Company of transferring information that would improve the design of Chinese rockets and ballistic missiles.[11] Although the Long March was allowed to launch its commercial backlog, theUnited States Department of State has not approved any satellite export licenses to China since 1998.ChinaSat 8, which had been scheduled for launch in April 1999 on aLong March 3B rocket,[12] was placed in storage, sold to the Singapore companyProtoStar, and finally launched on a European rocketAriane 5 in 2008.[11]
From 2005 to 2012, Long March rockets launched ITAR-free satellites made by the European companyThales Alenia Space.[13] However, Thales Alenia was forced to discontinue its ITAR-free satellite line in 2013 after the United States State Department fined a United States company for selling ITAR components.[14]Thales Alenia Space had long complained that "every satellite nut and bolt" was being ITAR-restricted, and theEuropean Space Agency (ESA) accused the United States of using ITAR to block exports to China instead of protecting technology.[15] In 2016, an official at theUnited States Bureau of Industry and Security confirmed that "no U.S.-origin content, regardless of significance, regardless of whether it is incorporated into a foreign-made item, can go to China". Since 2016, the European aerospace industry is working on developing replacements for United States satellite components.[16]
After the failures of 1992–1996, the troublesome Long March 2E was withdrawn from the market. Design changes were made to improve the reliability of Long March rockets. From October 1996 to April 2009, the Long March rocket family delivered 75 consecutive successful launches, including several major milestones in space flight:
The Long March rockets have subsequently maintained an excellent reliability record. Since 2010, Long March launches have made up 15–25% of all space launches globally. Growing domestic demand has maintained a healthy manifest. International deals have been secured through a package deal thatbundles the launch with a Chinese satellite, circumventing the United States embargo.[17]
The Long March is China's primary expendable launch system family. TheShenzhou spacecraft andChang'e lunar orbiters are also launched on the Long March rocket. The maximum payload forLEO is 25,000 kilograms (CZ-5B), the maximum payload forGTO is 14,000 kg (CZ-5). The next generation rocketLong March 5 variants will offer more payload in the future.
Long March 1's 1st and 2nd stage usednitric acid andunsymmetrical dimethylhydrazine (UDMH) propellants, and its upper stage used a spin-stabilized solid rocket engine.
Long March 2,Long March 3,Long March 4, the main stages and associatedliquid rocket boosters usedinitrogen tetroxide (N2O4) as theoxidizing agent andUDMH as the fuel. The upper stages (third stage) of Long March 3 rockets useYF-73 andYF-75 engines, usingliquid hydrogen (LH2) as the fuel andliquid oxygen (LOX) as the oxidizer.
The new generation of Long March rocket family,Long March 5 and its derivationsLong March 6,Long March 7,Long March 8, andLong March 10 use non-toxicLOX/kerosene andLOX/LH2 liquid propellants (except in some upper stages where UDMH/N2O4 continues to be used).
Long March 9 is being developed as a LOX/[[CH4]], ormethalox, rocket.
Long March 11 is asolid-fuel rocket.
Long March 12 uses non-toxicLOX/kerosene liquid propellants for the first 2 stages.
Timeline bars start at first launch (rather than start of development).
The Long March rockets are organized into several series:
The Long March 5, 6 and 7 are a newer generation of rockets sharing the new 1200 kN classYF-100 engines, which burnsRP-1 /LOX, unlike earlier 2, 3 and 4 series which uses more expensive and dangerousN2O4 /UDMH propellants.[18] The 5 series is aheavy-lift launch vehicle, with a capacity of 25,000 kg to LEO while the 6 series is asmall-lift launch vehicle with a capacity of 1,500 kg to LEO, and the 7 series is amedium-lift launch vehicle, with a capacity of 14,000 kg to LEO.
The Long March 10A is a partially-reusable crewed-rated rocket designed for LEO missions currently under development; the Long March 9 is initially designed to be partially reusable before becoming a fully reusable launcher.
| Model | Status | Stages | Length (m) | Max. diameter (m) | Liftoff mass (t) | Liftoff thrust (kN) | Payload (LEO, kg) | Payload (SSO, kg) | Payload (GTO, kg) |
|---|---|---|---|---|---|---|---|---|---|
| Long March 1 | Retired | 3 | 29.86 | 2.25 | 81.6 | 1020 | 300 | – | – |
| Long March 1D | Retired | 3 | 28.22 | 2.25 | 81.1 | 1101.2 | 930 | – | – |
| Long March 2A | Retired | 2 | 31.17 | 3.35 | 190 | 2,786 | 1,800 | – | – |
| Long March 2C | Active | 2 | 43.72 | 3.35 | 245 | 2,961.6 | 4,000 | 2,100 | 1,250 |
| Long March 2D | Active | 2 | 41.056 (without shield) | 3.35 | 249.6 | 2,961.6 | 3,500 | 1,300 | – |
| Long March 2E | Retired[19] | 2 (+ 4 boosters) | 49.686 | 3.35 | 464 | 5,923.2 | 9,500 | 4,350 | 3,500 |
| Long March 2F | Retired | 2 (+ 4 boosters) | 58.34 | 3.35 | 493 | 6512 | 8,800 | – | – |
| Long March 2F/G | Active | 2 (+ 4 boosters) | 58.34 | 3.35 | 493 | 6512 | 8,800 | – | – |
| Long March 2F/T | Active | 2 (+ 4 boosters) | 58.34 | 3.35 | 493 | 6512 | 8,800 | – | – |
| Long March 3 | Retired[19] | 3 | 44.9 | 3.35 | 205 | 2,961.6 | 5,000 | – | 1,600 |
| Long March 3A | Retired | 3 | 52.52 | 3.35 | 242 | 2,961.6 | 6,000 | 5,100 | 2,600 |
| Long March 3B | Retired[a] | 3 (+ 4 boosters) | 54.838 | 7.85 (including boosters) | 425.8 | 5,923.2 | 11,200 | 6,850 | 5,100 |
| Long March 3B/E | Active | 3 (+ 4 boosters) | 56.326 | 7.85 (including boosters) | 458.97 | 5923.2 | 11,500 | 7,100 | 5,500 |
| Long March 3C | Retired | 3 (+ 4 boosters) | 55.638 | 7.85 (including boosters) | 345 | 4,442.4 | 9,100 | 6,450 | 3,900 |
| Long March 3C/E | Active | 3 (+ 4 boosters) | 55.638 | 7.85 (including boosters) | 345 | 4,442.4 | 9,100 | 6,450 | 3,900 |
| Long March 4A | Retired | 3 | 41.9 | 3.35 | 241.1 | 2,961.6 | 3,800 | 1,600 | – |
| Long March 4B | Active | 3 | 48 | 3.35 | 249.2 | 2,961.6 | 4,200 | 2,295 | – |
| Long March 4C | Active | 3 | 48 | 3.35 | 249.2 | 2,961.6 | 4,200 | 2,947 | 1,500 |
| Long March 5[20][21] | Active | 2 (+ 4 boosters, optionalupper stage) | 57 | 11.7 (including boosters) | 854.5 | 10620 | – | – | 14,400 |
| Long March 5B | Active | 1 (+ 4 boosters) | 53.7 | 11.7 (including boosters) | 837.5 | 10620 | 25,000 | 15,000 | – |
| Long March 6[22][23] | Active | 3 | 29 | 3.35 | 103 | 1200 | >1,500 | 500~1,080 | – |
| Long March 6A | Active | 2 (+ 4 solid fuel boosters) | 50~55 | 7.35 (including boosters) | 530 | 7230 | >8,000 | >5,000 | – |
| Long March 6C | Active | 2 | 43 | 3.35 | 217 | 2,376 | 4,500 | 2,000 | 1,400 |
| Long March 7 | Active | 2 (+ 4 boosters) | 53 | 7.85 (including boosters) | 597 | 7,200 | 14,000 | 5,500 | – |
| Long March 7A | Active | 3 (+ 4 boosters) | 60.13–60.7 | 7.85 (including boosters) | 573 | 7,200 | – | – | 7,800 |
| Long March 8 | Active | 2 (2 boosters, optional) | 50.3 | 3–7.85 (including boosters) | 356.6 | 4,800 | 8,100[24] | 5,000[24] | 2,800[24] |
| Long March 8A | Active | 2 (+ 2 boosters) | 50.5 | 3.35–7.85 (including boosters) | 371 | 4,800 | 9,800 | 7,000 | 3,500 |
| Long March 9 | Planned | 3 | 114 | 10.6 | 4,369 | 60,000 | 150,000 | – | – |
| Long March 10 | Planned | 3 (+ 2 common core boosters) | 88.5–91.6 | 15 (including boosters) | 2,187 | 26,250 | 70,000 | – | 32,000 |
| Long March 10A | Planned | 3 | 88.5–91.6 | 5 | ? | 8750 | >18,000 expened >14,000 reusable | – | - |
| Long March 11 | Active | 4 | 20.8 | ~2 | 58 | 1188 | 700 | 350 | – |
| Long March 12 | Active | 2 | 62 | 3.8 | 433 | 5,000 | 12,000 | 6,000 | – |
| Long March 12A | Planned | 2 | 59 | 3.8 | 433 | 5,000 | 10,000 | 6,000 | – |
| 2A | 2C | 2D | 2E | 2F | 3 | 3A | 3B | 3C | 4A | 4B | 4C |
|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  |  |  |  |  |  |  |  |  |  |
The Long March 8 is a new series of launch vehicles, which is geared towardsSun-synchronous orbit (SSO) launches.[25] In early 2017, it was expected to be based on the Long March 7, and have two solid fuel boosters, and first launch by the end of 2018.[26] By 2019, it was intended to be partially reusable. The first stage will have legs and grid fins (likeFalcon 9) and it may land with side boosters still attached.[27] The first Long March 8 was rolled out to for a test launch on or around 20 December 2020 and launched on 22 December 2020.[28] The second flight with no side boosters occurred on 27 February 2022, sending a national record of 22 satellites intoSSO.[29][needs update]
The Long March 9 (LM-9, CZ-9, or Changzheng 9, Chinese: 长征九号) is a Chinese super-heavy carrier rocket concept proposed in 2018[30] that is currently in study. It is planned for a maximum payload capacity of 140,000 kg[31] tolow Earth orbit (LEO), 50,000 kg totrans-lunar injection or 44,000 kg toMars.[32][33] Its first flight is expected by 2028 or 2029 in preparation for a lunar landing sometime in the 2030s;[34] a sample return mission from Mars has been proposed as first major mission.[33] It has been stated that around 70% of the hardware and components needed for a test flight are currently undergoing testing, with the first engine test to occur by the end of 2018. The 2011 proposed design would be a three-staged rocket, with the initial core having a diameter of 10 meters and use a cluster of four engines. Multiple variants of the rocket have been proposed, CZ-9 being the largest with four liquid-fuel boosters with the aforementioned LEO payload capacity of 140,000 kg, CZ-9A having just two boosters and a LEO payload capacity of 100,000 kg, and finally CZ-9B having just the core stage and a LEO payload capacity of 50,000 kg.[35]
Approved in 2021, the Long March 9 is classified as asuper heavy-lift launch vehicle.[34] A very different design of LM-9 was announced in June 2021, with more engines and no external boosters.[36] Payload capacities are 160 tonnes to LEO and 53 tonnes to TLI.[37][38]
TheLong March 10, previously known as the "921 rocket",[39] is under development for crewed lunar missions. The nickname "921" refers to the founding date of China'shuman spaceflight program. Like the Long March 5, it uses 5-meter (16.4 ft) diameter rocket bodies andYF-100K engines, although with 7 engines on each of 3 cores.[40][41] The launch weight is 2187 tonnes, delivering 25 tonnes into trans-lunar injection.[42] The proposed crewed lunar mission uses two rockets; thecrewed spacecraft and lunar landing stack launch separately and rendezvous in lunar orbit.[43] Development was announced at the 2020 China Space Conference.[42] As of 2022, the first flight of this triple-cored rocket is targeted for 2027.[44]
There are four launch centers in China. They are:
Most of the commercial satellite launches of Long March vehicles have been fromXichang Satellite Launch Center, located inXichang,Sichuan province.Wenchang Spacecraft Launch Site inHainan province is under expansion and will be the main launch center for future commercial satellite launches. Long March launches also take place from the more military orientedJiuquan Satellite Launch Center inGansu province from which the crewedShenzhou spacecraft also launches.Taiyuan Satellite Launch Center is located inShanxi province and focuses on the launches ofSun-synchronous orbit (SSO) satellites.
On 5 June 2019, China launched aLong March 11 rocket from a mobile launch platform in theYellow Sea.[45]
China markets launch services under theChina Aerospace Science and Technology Corporation (China Great Wall Industry Corporation).[46] Its efforts to launch communications satellites were dealt a blow in the mid-1990s after the United States stopped issuing export licenses to companies to allow them to launch on Chinese launch vehicles out of fear that this would helpChina's military. In the face of this,Thales Alenia Space built theChinasat-6B satellite with no components from the United States whatsoever. This allowed it to be launched on a Chinese launch vehicle without violating United StatesInternational Traffic in Arms Regulations (ITAR) restrictions.[47] The launch, on a Long March 3B rocket, was successfully conducted on 5 July 2007.
A Chinese Long March 2D launchedVRSS-1 (Venezuelan Remote Sensing Satellite-1) ofVenezuela, "Francisco de Miranda" on 29 September 2012.
This article incorporates text from this source, which is in thepublic domain.
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