Engineering:Long March 2F

Short description: Chinese rocket

Long March 2F

The Long March 2F rocket with Shenzhou 13 spacecraft mounted on the top
Function	Crew-rated orbital launch vehicle
Manufacturer	China Academy of Launch Vehicle Technology (CALT)
Country of origin	China
Size
Height	62 m (203 ft)
Diameter	3.35 m (11.0 ft)
Mass	464,000 kg (1,023,000 lb)
Stages	2
Capacity
Payload to LEO	8,400 kg (18,500 lb)
Associated rockets
Family	Long March 2
Launch history
Status	Active
Launch sites	Jiuquan Satellite Launch Center
Total launches	22
Successes	22
First flight	19 November 1999
Last flight	14 December 2023
Notable payloads	Shenzhou Tiangong-1 Tiangong-2 Reusable experimental spacecraft
Boosters
No. boosters	4
Length	15.3 m (50 ft)
Diameter	2.3 m (7 ft 7 in)
Empty mass	3,200 kg (7,100 lb)
Gross mass	41,000 kg (90,000 lb)
Engines	1 YF-20B per booster
Thrust	814 kN (183,000 lbf)
Total thrust	3,256 kN (732,000 lbf)
Specific impulse	291 s (2.85 km/s)
Burn time	128 seconds
Fuel	N2O4 / UDMH
First stage
Length	23.7 m (78 ft)
Diameter	3.4 m (11 ft)
Empty mass	9,500 kg (20,900 lb)
Gross mass	196,500 kg (433,200 lb)
Engines	4 YF-20B
Thrust	3,256 kN (732,000 lbf)
Specific impulse	291 s (2.85 km/s)
Burn time	166 seconds
Fuel	N2O4 / UDMH
Second stage
Length	13.5 m (44 ft)
Diameter	3.4 m (11 ft)
Empty mass	5,500 kg (12,100 lb)
Gross mass	91,500 kg (201,700 lb)
Engines	1 YF-24B
Thrust	831 kN (187,000 lbf)
Specific impulse	289 s (2.83 km/s)
Burn time	300 seconds
Fuel	N2O4 / UDMH

The Long March 2F (Chinese: 长征二号F火箭 Changzheng 2F), also known as the CZ-2F, LM-2F and Shenjian (神箭, "Divine Arrow"), is a Chinese orbital carrier rocket, part of the Long March 2 rocket family. Designed to launch crewed Shenzhou spacecraft, the Long March 2F is a human-rated two-stage version of the Long March 2E rocket, which in turn was based on the Long March 2C launch vehicle. It is launched from complex SLS at the Jiuquan Satellite Launch Center. The Long March 2F made its maiden flight on 19 November 1999, with the Shenzhou 1 spacecraft. After the flight of Shenzhou 3, CPC General Secretary and President Jiang Zemin named the rocket "Shenjian", meaning "Divine Arrow".

On 29 December 2002, a Long March 2F launched Shenzhou 4 for a final uncrewed test of the Shenzhou spacecraft for the upcoming flight of the first crewed mission. Until then, all missions were uncrewed.

On 15 October 2003, a Long March 2F launched Shenzhou 5, China's maiden crewed mission and achieved its first human spaceflight. Since then, the rocket has launched seventeen more missions into orbit with the latest being the third test flight of a reusable experimental spacecraft.

Differences from the Long March 2E

Externally, the rocket is similar to the Long March 2E from which it was derived. Most of the changes involve the addition of redundant systems to improve safety, although there are some structural modifications that allow the rocket to support the heavier fairing required by the Shenzhou capsule. The rocket is also capable of lifting heavier payloads with the addition of extra boosters to the first stage.

The rocket also has an "advanced fault monitoring and diagnosis system to help the astronauts escape in time of emergency" (in other words, a launch escape system), and is the first Chinese made rocket to be assembled and rolled out to its launch site vertically.

Derivatives

A derivative called Long March 2F/G, first launched in 2011, was made to replace the existing 2F variant. For uncrewed launches, Long March 2F/T was designed, which launched space laboratories such as Tiangong-1 and Tiangong-2. It dispenses with the launch escape system and supports a larger fairing to accommodate the bulkier payloads. For launching payloads like reusable experimental spacecraft, this Long March 2F/G needs to add four? 3,600 m² (39,000 sq ft) ?? cusps on its fairing to accommodate the payload (as seen in post launch fairings), developing thoughts that the spacecraft resembles US Boeing X37-B.

Vibration issues

During the Shenzhou 5 flight, Yang Liwei became unwell due to heavy vibrations from the rocket. Although the problem was reduced somewhat by modifications to the rocket, vibrations were reported again in Shenzhou 6 necessitating further changes. According to Jing Muchun, chief designer of the Long March 2F "We made changes to the pipelines of the rocket engine, adjusting its frequency. A new design for the pressure accumulator produced evident results. The vibration has now been reduced by more than 50%". During the launch preparations for the Shenzhou 14 mission chief designer Gao Xu said incremental improvements made to the rocket's design mean vibrations felt by the taikonauts would be similar to that felt in a car driven on a highway.

The predecessor Long March 2E had also been known for vibration. During two launches, excessive vibration caused the collapse of the payload fairing, destroying the Optus B2 and Apstar 2 satellites. After the payload fairing was redesigned, excessive vibration also damaged the AsiaSat 2 satellite during launch. After its successful launch of the Echostar 1 satellite on 28 December 1995 the rocket was officially retired from service.

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  Long March 2F rocket schematics

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  The Long March 2F rocket with folded grid fins carrying Shenzhou 12 mission spacecraft, inscribed with "Divine Arrow" (神箭) in Chinese

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  Launch of Shenzhou 13

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  Shenzhou 15 before liftoff

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  Rendering of Long March 2F/G

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  Rendering of Long March 2F/T

List of launches

Flight number	Serial number	Date (UTC)	Launch site	Payload	Orbit	Crew	Result	Remarks
1	Y1	19 November 1999 22:30	LA-4/SLS-1, JSLC	Shenzhou 1	LEO	N/A	Success	First uncrewed test of the Shenzhou spacecraft
2	Y2	9 January 2001 17:00	LA-4/SLS-1, JSLC	Shenzhou 2	LEO	N/A	Success	Second uncrewed test of the Shenzhou spacecraft, carried live animals.
3	Y3	25 March 2002 14:15	LA-4/SLS-1, JSLC	Shenzhou 3	LEO	N/A	Success	Third uncrewed test of the Shenzhou spacecraft.
4	Y4	29 December 2002 16:40	LA-4/SLS-1, JSLC	Shenzhou 4	LEO	N/A	Success	Final uncrewed test of the Shenzhou spacecraft prior to flying with crew.
5	Y5	15 October 2003 01:00	LA-4/SLS-1, JSLC	Shenzhou 5	LEO	Yang Liwei	Success	China's first crewed spaceflight.
6	Y6	12 October 2005 01:00	LA-4/SLS-1, JSLC	Shenzhou 6	LEO	Fei Junlong Nie Haisheng	Success	Second crewed spaceflight, first with two astronauts.
7	Y7	25 September 2008 13:10	LA-4/SLS-1, JSLC	Shenzhou 7	LEO	Zhai Zhigang Liu Boming Jing Haipeng	Success	First flight with three crew members, first to feature extravehicular activity.
8	T1	29 September 2011 13:16	LA-4/SLS-1, JSLC	Tiangong 1	LEO	N/A	Success	The first Chinese space station. Modified version Long March 2F/G with larger payload fairing.
9	Y8	31 October 2011 21:58	LA-4/SLS-1, JSLC	Shenzhou 8	LEO	N/A	Success	Uncrewed spaceflight to test automatic rendezvous and docking with Tiangong-1
10	Y9	16 June 2012 10:37	LA-4/SLS-1, JSLC	Shenzhou 9	LEO	Jing Haipeng Liu Wang Liu Yang	Success	Three crew members, to test rendezvous and docking with Tiangong-1.
11	Y10	11 June 2013 09:38	LA-4/SLS-1, JSLC	Shenzhou 10	LEO	Nie Haisheng Zhang Xiaoguang Wang Yaping	Success	Three crew members; rendezvous and docking with Tiangong-1.
12	T2	15 September 2016 14:04	LA-4/SLS-1, JSLC	Tiangong 2	LEO	N/A	Success	Second Chinese space laboratory Tiangong-2, launched by 2F/G variant.
13	Y11	16 October 2016 23:30	LA-4/SLS-1, JSLC	Shenzhou 11	LEO	Jing Haipeng Chen Dong	Success	Two crew members; rendezvous and docking with Tiangong-2 for a 30-day mission.
14	T3	4 September 2020 07:30	LA-4/SLS-1, JSLC	Reusable Experimental Spacecraft	LEO	N/A	Success	Test flight of a reusable experimental spacecraft.
15	Y12	17 June 2021 01:22	LA-4/SLS-1, JSLC	Shenzhou 12	LEO	Nie Haisheng Liu Boming Tang Hongbo	Success	Three crew members; first visit to Tianhe, the first module of the Chinese Space Station, for a three-month mission.
16	Y13	15 October 2021 16:23	LA-4/SLS-1, JSLC	Shenzhou 13	LEO	Zhai Zhigang Wang Yaping Ye Guangfu	Success	Three crew members; visited Tianhe to continue construction of the space station for a six-month mission.
17	Y14	5 June 2022 02:44	LA-4/SLS-1, JSLC	Shenzhou 14	LEO	Chen Dong Liu Yang Cai Xuzhe	Success	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.
18	T4	4 August 2022 16:00	LA-4/SLS-1, JSLC	Reusable Experimental Spacecraft	LEO	N/A	Success	Second test flight of a reusable experimental spacecraft.
19	Y15	29 November 2022 15:08	LA-4/SLS-1, JSLC	Shenzhou 15	LEO	Fei Junlong Deng Qingming Zhang Lu	Success	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.
20	Y16	30 May 2023 01:31	LA-4/SLS-1, JSLC	Shenzhou 16	LEO	Jing Haipeng Zhu Yangzhu Gui Haichao	Success	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.
21	Y17	26 October 2023 03:13	LA-4/SLS-1, JSLC	Shenzhou 17	LEO	Tang Hongbo Tang Shengjie Jiang Xinlin	Success	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.
22	T5	14 December 2023 14:12	LA-4/SLS-1, JSLC	Reusable Experimental Spacecraft	LEO	N/A	Success	Third test flight of a reusable experimental spacecraft.
23	Y18	April 2024	LA-4/SLS-1, JSLC	Shenzhou 18	LEO	TBA TBA TBA	Planned	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.
24	Y19	October 2024	LA-4/SLS-1, JSLC	Shenzhou 19	LEO	TBA TBA TBA	Planned	Three crew members; rendezvous and docking with the Chinese space station for a six-month mission.