|Function||Heavy-lift launch vehicle|
|Country of origin||China|
|Height||56.97 m (186.9 ft)|
|Diameter||5 m (16 ft)|
|Mass||854,500 kg (1,883,900 lb)|
|Payload to LEO|
|Altitude||200 km × 400 km (120 mi × 250 mi)|
|Mass||25,000 kg (55,000 lb) |
|Payload to GTO|
|Mass||14,500 kg (32,000 lb) |
|Payload to TLI|
|Mass||8,800–9,400 kg (19,400–20,700 lb)|
|Payload to GEO|
|Mass||6,000 kg (13,000 lb)|
|Payload to SSO|
|Altitude||700 km (430 mi)|
|Mass||15,000 kg (33,000 lb)|
|Payload to SSO|
|Altitude||2,000 km (1,200 mi)|
|Mass||6,700 kg (14,800 lb)|
|Payload to MEO|
|Mass||13,000 kg (29,000 lb)|
|Payload to TMI|
|Mass||6,000 kg (13,000 lb)|
|Launch sites||Wenchang, LC-1|
|Notable payloads||Next-generation crewed spacecraft, Chang'e 5, Tianwen 1|
|Boosters – CZ-5-300|
|Length||27.6 m (91 ft)|
|Diameter||3.35 m (11.0 ft)|
|Gross mass||156,600 kg (345,200 lb)|
|Propellant mass||142,800 kg (314,800 lb)|
|Engines||2 × YF-100|
|Thrust||Sea level: 2,400 kN (540,000 lbf)|
Vacuum: 2,680 kN (600,000 lbf)
|Total thrust||9,600 kN (2,200,000 lbf)|
|Specific impulse||Sea level: 300 s (2.9 km/s)|
Vacuum: 335 s (3.29 km/s)
|Burn time||173 seconds|
|Propellant||RP-1 / LOX|
|First stage – CZ-5-500|
|Length||33.16 m (108.8 ft)|
|Diameter||5 m (16 ft)|
|Gross mass||186,900 kg (412,000 lb)|
|Propellant mass||165,300 kg (364,400 lb)|
|Engines||2 × YF-77|
|Thrust||Sea level: 1,020 kN (230,000 lbf)|
Vacuum: 1,400 kN (310,000 lbf)
|Specific impulse||Sea level: 320 s (3.1 km/s)|
Vacuum: 430 s (4.2 km/s)
|Burn time||492 seconds|
|Propellant||LH2 / LOX|
|Second stage – CZ-5-HO|
|Length||11.54 m (37.9 ft)|
|Diameter||5 m (16 ft)|
|Gross mass||38,700 kg (85,300 lb)|
|Propellant mass||32,000 kg (71,000 lb)|
|Engines||2 × YF-75D|
|Thrust||176.72 kN (39,730 lbf)|
|Specific impulse||442 s (4.33 km/s)|
|Burn time||700 seconds|
|Propellant||LH2 / LOX|
|Third stage – YZ-2 (Optional)|
|Diameter||3.8 m (12 ft)|
|Engines||2 x YF-50D|
|Thrust||6.5 kN (1,500 lbf)|
|Specific impulse||316 s (3.10 km/s)|
|Burn time||1105 seconds|
|Propellant||N2O4 / UDMH|
Long March 5 (LM-5; Chinese: 长征五号; pinyin: Chángzhēng wǔ hào), also known as Chang Zheng 5 (CZ-5), is a Chinese heavy-lift launch vehicle developed by the China Academy of Launch Vehicle Technology (CALT). It is the first Chinese launch vehicle designed to use exclusively non-hypergolic liquid propellants. It is the fifth iteration of the Long March rocket family, named for the Chinese Red Army's 1934–35 Long March, during the Chinese Civil War.
There are currently two CZ-5 variants: CZ-5 and CZ-5B. The maximum payload capacities are approximately 25,000 kg (55,000 lb) to low Earth orbit (for CZ-5B) and approximately 14,000 kg (31,000 lb) to geostationary transfer orbit (for CZ-5). The Long March 5 roughly matches the capabilities of American NSSL heavy-lift launch vehicles such as the Delta IV Heavy. It is currently the most powerful member of the Long March rocket family and the world's third most powerful orbital launch vehicle currently in operation, trailing the Falcon Heavy and Delta IV Heavy.
The first CZ-5 launched from Wenchang Spacecraft Launch Site on 3 November 2016 and placed its payload in a suboptimal but workable initial orbit. The second CZ-5 rocket, launched on 2 July 2017, failed due to an engine problem in the first stage.
After an interval of almost two and a half years, the Long March 5 vehicle's return to flight mission (third launch) successfully occurred on 27 December 2019 with the launch and placement of the experimental Shijian-20 communications satellite into geostationary transfer orbit, thereby opening the way for the successful launch of Tianwen 1 Mars mission, lunar Chang'e 5 sample-return mission, and the modular space station, which require the lifting capabilities of a heavy lift launch vehicle.
Since 2010, Long March launches (all versions) have made up 15–25% of the global launch totals. Growing domestic demand for launch services has also allowed China's state launch provider to maintain a healthy manifest. Additionally, China had been able to secure some international launch contracts by offering package deals that bundle launch vehicles with Chinese satellites, thereby circumventing the effects of U.S. embargo.
China's main objective for initiating the new CZ-5 program in 2007 was in anticipation of its future requirement for larger LEO and GTO payload capacities during the next 20–30 years period. Formal approval of the Long March 5 program occurred in 2007 following two decades of feasibility studies when funding was finally granted by the Chinese government. At the time, the new rocket was expected to be manufactured at a facility in Tianjin, a coastal city near Beijing, while launch was expected to occur at the new Wenchang Spacecraft Launch Site in the southernmost island province of Hainan.
The first photos of a CZ-5, undergoing tests, were released in March 2015.
The maiden flight of the CZ-5 was initially scheduled for 2014, but this subsequently slipped to 2016.
The final production and testing of the first CZ-5 rocket to be launched into orbit were completed at its Tianjin manufacturing facility on or about 16 August 2016 and the various segments of the rocket were shipped to the launch center on Hainan island shortly thereafter.
The chief designer of CZ-5 is Li Dong (Chinese: 李东) of the China Academy of Launch Vehicle Technology (CALT). The CZ-5 family include three primary modular core stages of 5.2-m diameter (maximum). The total length of the vehicle is 60.5 metres and its weight at launch is 643 tons, with a thrust of 833.8 tons. Boosters of various capabilities and diameters ranging from 2.25 metres to 3.35 metres would be assembled from three modular core stages and strap-on stages. The first stage and boosters would have a choice of engines that use different liquid rocket propellants: 1200 kN thrust LOX / kerosene engines or 1550 kN thrust LOX / LH2. The upper stage would use improved versions of the YF-75 engine.
Engine development began in 2000–2001, with testing directed by the China National Space Administration (CNSA) commencing in 2005. Versions of both new engines, the YF-100 and the YF-77, had been successfully tested by mid-2007.
The CZ-5 series can deliver ~23 tonnes payload to LEO or ~14 tonnes payload to GTO (geosynchronous transfer orbit). It will replace the CZ-2, CZ-3, and CZ-4 series in service, as well as provide new capabilities[clarification needed] not possessed by the previous Long March rocket family. The CZ-5 launch vehicle would consist of a 5.0-m diameter core stage and four 3.35-m diameter strap-on boosters, which would be able to send a ~22 tonne payload to low Earth orbit (LEO).
|Boosters||4 × CZ-5-300, 2 × YF-100||4 × CZ-5-300, 2 × YF-100|
|First stage||CZ-5-500, 2 × YF-77||CZ-5-500, 2 × YF-77|
|Second stage||CZ-5-HO, 2 × YF-75D||—|
|Third stage (optional)||Yuanzheng-2||—|
|Thrust (at ground)||10620 KN||10620 KN|
|Launch weight||854,500 kg||837,500 kg |
|Height||56.97 m||53.66 m|
|Payload (LEO 200 km)||—||~25,000 kg |
|Payload (GTO)||14,400 kg ||—|
|Boosters||—||2 × CZ-5-200, YF-100||2 × CZ-5-200, YF-100; 2 × CZ-5-300, 2 × YF-100||4 × CZ-5-200, YF-100|
|First stage||CZ-5-200, YF-100||CZ-5-300, 2 × YF-100||CZ-5-500, 2 × YF-77||CZ-5-500, 2 × YF-77|
|Second stage||CZ-YF-73, YF-73||CZ-5-KO,||CZ-5-HO, 2 × YF-75D||CZ-5-HO, 2 × YF-75D|
|Third stage (not used for LEO)||—||CZ-5-HO, YF-75||—||—|
|Thrust (at ground)||1.34 MN||7.2 MN||8.24 MN||5.84 MN|
|Launch weight||82,000 kg||420,000 kg||630,000 kg||470,000 kg|
|Height (maximal)||33 m||55 m||58 m||53 m|
|Payload (LEO 200 km)||1500 kg||10,000 kg||20,000 kg||10,000 kg|
|Payload (GTO)||—||6000 kg||11,000 kg||6000 kg|
The launch was planned to take place at around 10:00 UTC on 3 November 2016, but several issues, involving an oxygen vent and chilling of the engines, were detected during the preparation, causing a delay of nearly three hours. The final countdown was interrupted three times due to problems with the flight control computer and the tracking software. The rocket finally launched at 12:43 UTC.
Its second launch on 2 July 2017 experienced an anomaly shortly after launch and was switched to an alternate, gentler trajectory. However, it was declared a failure 45 minutes into the flight. Investigations revealed the source of the second flight's failure to be located in one of the core stage's YF-77 engines (specifically, in the oxidizer's turbo-pump).
The Y3 mission of the Long March 5 program was launched on 27 December 2019, at about 12:45 UTC from the Wenchang Spacecraft Launch Site in Hainan, China. CASC declared the mission a success within an hour of launch, after the Shijian-20 communications satellite was placed in geostationary transfer orbit, thus marking the Long March 5 program's return to flight.
The fourth flight of the Long March 5 program also marked the debut of the CZ-5B variant. The CZ-5B variant is basically equivalent to the Long March 5 core stage with its four strapped-on liquid-fueled boosters; in place of the usual second stage of the base configuration, it is anticipated that heavier low Earth orbit payloads, such as components of the future modular space station, would be carried by the 5B variant.
The first flight of the 5B variant ("Y1 mission") carried an uncrewed prototype of China's future deep space crewed spacecraft, and, as a secondary payload, the Flexible Inflatable Cargo Re-entry Vehicle. The Y1 mission was launched on 5 May 2020, at 10:00 UTC from the Wenchang Spacecraft Launch Site in Hainan Island. CASC declared the launch a success after the payloads were placed in low Earth orbit.
The flight's secondary payload, the experimental cargo return craft, malfunctioned during its return to Earth on 6 May 2020. Nevertheless, the return capsule of the prototype next-generation crewed spacecraft, the flight's primary payload, successfully landed in north China's Inner Mongolia Autonomous Region at 05:49 UTC, on 8 May 2020. The prototype spacecraft flew in orbit for two days and 19 hours and carried out a series of successful experiments and technological verifications. The Y1 mission's core stage may have been the most massive object to make an uncontrolled re-entry since the Soviet Union's Salyut 7 space station in 1991 and the United States' Skylab in 1979, excluding the failed controlled reentry of Space Shuttle Columbia over populated areas of the Continental United States in 2003.[a]
|Flight №||Date (UTC)||Variant||Launch site||Upper stage||Payload||Orbit||Result|
|Y1||3 November 2016
|5||Wenchang, LC-1||YZ-2||Shijian 17||GEO||Success|
|Y2||2 July 2017
|5||Wenchang, LC-1||None||Shijian 18||GTO||Failure|
|Y3||27 December 2019
|5||Wenchang, LC-1||None||Shijian 20||GTO||Success|
|5B-Y1||5 May 2020
|5B||Wenchang, LC-1||None||Next-generation crewed spacecraft||LEO||Success|
|Y4||23 July 2020
|5||Wenchang, LC-1||None||Tianwen-1 Mars orbiter, lander and rover||TMI||Success|
|Y5||23 November 2020
|5||Wenchang, LC-1||None||Chang'e 5, lunar sample-return||TLI||Success|
|5B-Y2||29 April 2021
|5B||Wenchang, LC-1||None||Tianhe, space station core module||LEO||Success[b]|
|Flight №||Date (UTC)||Variant||Launch site||Upper stage||Payload||Orbit||Status|
|5B-Y3||May–June 2022||5B||Wenchang, LC-1||None||Wentian, Chinese space station experiment module 1||LEO||Planned|
|5B-Y4||August–September 2022||5B||Wenchang, LC-1||None||Mengtian, Chinese space station experiment module 2||LEO||Planned|
|2023 or 2024||5||Wenchang, LC-1||None||Chang'e 6, lunar sample-return||TLI||Planned|
|2024||5||Wenchang, LC-1||None||Chang'e 7, Lunar Antarctic Comprehensive Exploration Mission||TLI||Planned|
|2024||5B||Wenchang, LC-1||None||Xuntian, space telescope co-orbiting with the Chinese space station||LEO||Planned|
|2027||5||Wenchang, LC-1||None||Chang'e 8, Scientific exploration test, lunar surface test
Verify the construction of lunar scientific research base
|2029||5||Wenchang, LC-1||None||Jupiter orbiter and interplanetary flyby probe||Heliocentric orbit||Planned|
Chinese Rocket Engine Test a Big Step for Space Station Project