Long March (rocket family)

A Long March rocket (simplified Chinese: 长征系列运载火箭; traditional Chinese: 長征系列運載火箭; pinyin: Chángzhēng xìliè yùnzài huǒjiàn) or Chang Zheng rocket as in Chinese pinyin is any rocket in a family of expendable launch systems operated by the People's Republic of China. Development and design falls under the auspices of the China Academy of Launch Vehicle Technology. In English, the rockets are abbreviated as LM- for export and CZ- within China, as "Chang Zheng" means "Long March" in Chinese pinyin. The rockets are named after the Long March of Chinese communist history.

History

Long March 3A launch

Long March 3B launch

Main article: List of Long March rocket launches

China launched its first satellite, known as Dong Fang Hong 1 ("the East is Red"), to Earth orbit on its own Long March space rocket on April 24, 1970, becoming the fifth nation to achieve independent launch capability. Early launches had a spotty record, focusing on launching of Chinese satellites. Since 1990, Long March rocket entered the international market. However, several setbacks occurred during early 1990s. On January 26, 1995, a Long March 2E rocket veered off course two seconds after take-off from Xichang space center and exploded, killing at least six on the ground. On February 14, 1996, a similar failure during the launch of Intelsat 708. The rocket veered severely off course right after clearing the launch tower and crashed in a rural village. Following the disaster, foreign media were sequestered in a bunker for five hours while, some have alleged, the Chinese military attempted to 'clean up' the damage. Officials later blamed the failure on an "unexpected gust of wind"^[1] Xinhua News Agency initially reported 6 deaths and 57 injuries. In the aftermath of the explosion, U.S. satellite makers shared information which allowed the Chinese to determine that the problem was in the welds.^[2] However, this sharing of information was later deemed illegal by the United States, and U.S. satellite maker Loral Space and Communications was fined $14 million by the U.S. government in 2002, while admitting no wrong-doing.^[3]

For thirteen years, between August 1996 and August 2009, 75 consecutive successful launches were conducted, ending with the launch of Palapa-D on August 31, 2009, which partially failed due to a third stage malfunction.^[4] On October 15, 2003, the Long March 2F rocket successfully launched the Shenzhou 5 spacecraft/orbiter carrying China's first astronaut into space; China thus became the third nation to send a person in space independently, after the Soviet Union/Russia and the United States. A Long March 2F launched the Shenzhou 6 with two astronauts on October 12, 2005. On June 1, 2007, Long March rockets completed the 100th launch. On October 24, 2007, the Long March 3A successfully launched (18:05 GMT+8) the "Chang'e 1" lunar orbiting spacecraft from the Xichang Satellite Launch Center. On September 25, 2008, a Long March 2F launched Shenzhou 7, China's first three-man mission and first EVA mission.

Payloads

The Long March is China's primary expendable launch system family. The Shenzhou spacecraft and Chang'e lunar orbiters are also launched on the Long March rocket. The maximum payload for LEO is 12,000 kg (CZ-3B), the maximum payload for GTO is 5,500 kg (CZ-3B/E). The next generation rocket – Long March 5 variants will offer more payload in the future.

Propellants

Long March 1's 1st and 2nd stage uses HNO3 and UDMH propellants, and its upper stage use a spin-stabilized solid rocket engine.

Long March 2, Long March 3, Long March 4, the main stages and associated liquid rocket boosters use dinitrogen tetroxide as the oxidizing agent and UDMH as the fuel. The upper stages (third stage) of Long March 3 rockets use YF-73 and YF-75 engines, using Liquid hydrogen (LH2) as the fuel and Liquid oxygen (LOX) as the oxidizer.

The new generation of Long March rocket family, Long March 5, and its derivations Long March 6, Long March 7 will use LOX and kerosene as core stage and liquid booster propellant, while LOX and LH2 in upper stages.

Specifications of Long March rocket family

The Long March rockets are organized into several series:

• Long March 1 rocket family
• Long March 2 rocket family
• Long March 3 rocket family
• Long March 4 rocket family
• Long March 5 rocket family
• Long March 6 rocket family
• Long March 7 rocket family

Model	Status	Stages	Length (m)	Max. diameter (m)	Liftoff mass (t)	Liftoff thrust (kN)	Payload (LEO, kg)	Payload (GTO, kg)
Long March 1	Retired	3	29.86	2.25	081.6	1,020	300	-
Long March 1D	Retired	3	28.22	2.25	081.1	1,101	930	-
Long March 2A	Retired	2	31.17	3.35	190	2,786	1,800	-
Long March 2C	Active	2	35.15	3.35	192	2,786	2,400	-
Long March 2D	Active	2	33.667 (without shield)	3.35	232	2,962	3,100	-
Long March 2E	Retired[5]	2 (plus 4 Strap-on boosters)	49.686	7.85	462	5,923	9,500	3,500
Long March 2E(A)	In development[6]	2 (plus 4 Strap-on boosters)	53.60	N/A	695	8,910	14,100	-
Long March 2F	Active	2 (plus 4 Strap-on boosters)	58.34	7.85	480	5,923	8,400	3,370
Long March 2F/G	Active	2 (plus 4 Strap-on boosters)	N/A	7.85	N/A	N/A	11,200	N/A
Long March 3	Retired[5]	3	43.8	3.35	202	2,962	5,000	1,500
Long March 3A	Active	3	52.52	3.35	241	2,962	8,500	2,600
Long March 3B	Retired?	3 (plus 4 Strap-on boosters)	54.838	4.00	426	5,924	12,000	5,100
Long March 3B/E	Active	3 (plus 4 Strap-on boosters)	56.326	4.20	458.97	?	?	5,500
Long March 3B(A)	In development	3 (plus 4 Strap-on boosters)	62.00	4.20	580	8,910	13,000	6,000
Long March 3C	Active	3 (plus 2 Strap-on boosters)	55.638	7.85	345	4,443	?	3,800
Long March 4A	Retired	3	41.9	3.35	249	2,962	4,000	(SSO) 1,500
Long March 4B	Active	3	44.1	3.8	254	2,971	4,200	(SSO) 2,200
Long March 4C	Active	3		3.35		2,971?	4,200	(SSO) 2,800
Long March 5[7][8]	In development[9][10][11]	3	N/A	N/A	N/A	N/A	25,000	14,000
Long March 6[12][13]	In development	3						(SSO) 500

2A	2C	2D	2E	2F	3	3A	3B	3C	4A	4B	4C

Origins

The Long March 1 rocket is derived from earlier Chinese 2-stage IRBM DF-4, or Dong Feng 4 missile, and Long March 2, Long March 3, Long March 4 rocket families are ascends of Chinese 2-stage ICBMs DF-5, or Dong 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 a space rocket is to maximize payload, while for strategic missiles increased throw weight is much less important than the ability to launch quickly and to survive a first strike. This divergence has become clear in the next generation of Long March rockets which use cryogenic propellants in sharp contrast to the next generation of strategic missiles which are mobile and solid fuelled.

The next generation of Long March rocket, Long March 5 rocket family will be a brand new design, while Long March 6 and Long March 7 can be seen as derivations because they use the liquid rocket booster design of Long March 5 to build small-to-mid capacity launch vehicles.

Launch sites

There are four launch centers in China. They are:

• Jiuquan Satellite Launch Center
• Taiyuan Satellite Launch Center
• Wenchang Satellite Launch Center
• Xichang Satellite Launch Center

Most of the commercial satellite launches of Long March vehicles have been from Xichang Satellite Launch Center, located in Xichang, Sichuan province. Wenchang Satellite Launch Center in Hainan 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 oriented Jiuquan Satellite Launch Center in Gansu province from which the manned Shenzhou spacecraft also launches. Taiyuan Satellite Launch Center is located in Shanxi province and focuses on the launches of Sun-synchronous orbit satellites.

Commercial launch services

China markets launch services under the China Great Wall Industry Corporation.^[14] 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 help China's military. In the face of this, Thales Alenia Space built the Chinasat-6B satellite with no components from the United States whatsoever. This allowed it to be launched on a Chinese launch vehicle without violating U.S. ITAR restrictions.^[15] The launch, on a Long March 3B rocket, was successfully conducted on July 5, 2007.

See also

Spaceflight portal

• China National Space Administration
• Shenzhou spacecraft
• Space program of China
• Tsien Hsue-shen

References

1. ^ "China's Space Disasters". Discovery. http://www.youtube.com/watch?v=pq9iYyBYJMI#t=1m20s. 
2. ^ "Hughes and Loral: Too Eager to Help China?". Business Week. September 13, 1999. http://www.businessweek.com/archives/1999/b3646155.arc.htm. 
3. ^ Mintz, John, "2 U.S. space giants accused of aiding China Hughes, Boeing allegedly gave away missile technology illegally", Washington Post, Jan. 1, 2003
4. ^ ""帕拉帕－Ｄ"通信卫星未能进入预定轨道". Xinhua. August 31, 2009. http://news.xinhuanet.com/mil/2009-08/31/content_11973441.htm. Retrieved August 31, 2009. 
5. ^ ^{a b} "CZ". Astronautix.com. http://www.astronautix.com/lvs/cz.htm. Retrieved 2010-08-10. 
6. ^ "CZ-2EA地面风载试验". 中国空气动力研究与发展中心. February 4, 2008. http://www.cardc.cn/show_field.asp?wt_id=2&field_name=WT_PROJECT. Retrieved June 30, 2008. 
7. ^ SinoDefence.com - ChangZheng 5 (Long March 5)
8. ^ Encyclopedia Astronautica - CZ-NGLV
9. ^ "让年轻人与航天事业共同成长". 中国人事报. March 14, 2008. http://www.rensb.com/showarticle.php?articleID=9325. Retrieved July 19, 2008. 
10. ^ 中国科学技术协会 (2007). 航天科学技术学科发展报告, page [http://www.war-sky.com/forum/attachment/Day_080715/18_133702_9d57ed33e00af02.jpg 17]. Beijing, PRC: 中国科学技术协会出版社. ISBN 750464866. http://mallimg.sina.com.cn/p/bookuu/001/704/PD_1704953L.jpg. 
11. ^ "国际空间大学公众论坛关注中国航天（3）". People Daily. July 11, 2007. http://news.people.com.cn/GB/5971395.html. Retrieved July 13, 2007. 
12. ^ "China starts developing Long March 6 carrier rockets for space mission _English_Xinhua". News.xinhuanet.com. 2009-09-06. http://news.xinhuanet.com/english/2009-09/06/content_12003432.htm. Retrieved 2010-08-10. 
13. ^ "ChangZheng 6 (Long March 6) Launch Vehicle". SinoDefence.com. 2009-02-20. http://www.sinodefence.com/space/launcher/changzheng6.asp. Retrieved 2010-08-10. 
14. ^ "About CGWIC". CGWIC. http://www.cgwic.com/about/index.html. 
15. ^ "China launches satellite despite restrictions". USA TODAY. July 6, 2007. http://www.usatoday.com/tech/science/space/2007-07-06-china-launches-satellite_N.htm. Retrieved May 11, 2010. 

External links

• Extensive information on the Chinese space program
• China Great Wall Industry Corporation
• NASA links - substitute year for other years
• Long March Engines List
• Rocket and Space Technology
• Chinese Launch Vehicle Overview