Long March 7
 Long March 7 Y6 transporting to launch site | |
| Function | Medium to heavy-lift launch vehicle |
|---|---|
| Manufacturer | China Academy of Launch Vehicle Technology |
| Country of origin | China |
| Size | |
| Height |
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| Diameter | 3.35 m (11 ft) |
| Mass |
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| Stages |
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| Capacity | |
| Payload to LEO | |
| Altitude | 200 × 400 km (120 × 250 mi) |
| Orbital inclination | 42° |
| Mass | 13,500 kg (29,800 lb) |
| Payload to GTO | |
| Mass | 7,000 kg (15,000 lb) |
| Payload to TLI | |
| Mass | 5,000 kg (11,000 lb) |
| Payload to SSO | |
| Altitude | 700 km (430 mi) |
| Mass | 5,500 kg (12,100 lb) |
| Associated rockets | |
| Family | Long March |
| Comparable | |
| Launch history | |
| Status | Active |
| Launch sites | Wenchang, LC-2 |
| Total launches | 29 (7: 11, 7A: 18) |
| Success(es) | 27 (7: 11, 7A: 16) |
| Failure | 2 (7: 0, 7A: 2) |
| First flight |
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| Last flight |
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| Boosters – K2 | |
| No. boosters | 4 |
| Height | 27 m (89 ft) |
| Diameter | 2.25 m (7 ft 5 in) |
| Powered by | 1 × YF-100 |
| Maximum thrust | SL: 1,200 kN (270,000 lbf) vac: 1,340 kN (300,000 lbf) |
| Total thrust | SL: 4,800 kN (1,100,000 lbf) vac: 5,360 kN (1,200,000 lbf) |
| Specific impulse | SL: 300 s (2.9 km/s) vac: 335 s (3.29 km/s) |
| Propellant | RP-1 / LOX |
| First stage – K3 | |
| Diameter | 3.35 m (11.0 ft) |
| Powered by | 2 × YF-100 |
| Maximum thrust | SL: 2,400 kN (540,000 lbf) vac: 2,680 kN (600,000 lbf) |
| Specific impulse | SL: 300 s (2.9 km/s) vac: 335 s (3.29 km/s) |
| Propellant | RP-1 / LOX |
| Second stage | |
| Diameter | 3.35 m (11.0 ft) |
| Powered by | 4 × YF-115 |
| Maximum thrust | 706 kN (159,000 lbf) |
| Specific impulse | 342 s (3.35 km/s) |
| Propellant | RP-1 / LOX |
| Third stage (CZ-7A) | |
| Diameter | 3.0 m (9.8 ft) |
| Empty mass | 2,800 kg (6,200 lb) |
| Gross mass | 21,000 kg (46,000 lb) |
| Propellant mass | 18,200 kg (40,100 lb) |
| Powered by | 2 × YF-75 |
| Maximum thrust | 167.17 kN (37,580 lbf) |
| Specific impulse | 4,295 m/s (438.0 s) |
| Burn time | 478 seconds |
| Propellant | LH2 / LOX |
| Third stage (CZ-7, optional) – YZ-1A | |
| Powered by | 1 × YF-50D |
| Maximum thrust | 6.5 kN (1,500 lbf) |
| Specific impulse | 315.5 s (3.094 km/s) |
| Propellant | N2O4 / UDMH |
The Long March 7 (Chinese: 长征七号运载火箭), or Chang Zheng 7 in pinyin, abbreviated LM-7 for export or CZ-7 within China, originally Long March 2F/H or Chang Zheng 2F/H, nicknamed Bingjian (冰箭; 'the Ice Arrow'), is a Chinese liquid-fuelled medium-lift launch vehicle of the Long March family, developed by the China Aerospace Science and Technology Corporation (CAST). It made its inaugural flight on 25 June 2016.
Designed as a replacement of the Long March 2F, Long March 7 and its variants was expected to be the workhorse of the fleet, projected to account for around 70% of all Chinese launches. Long March 7 plays a critical role in the Tiangong space station program: it is used to launch the Tianzhou robotic cargo and resupply spacecraft. Although initially planned to replace the Long March 2F as China's crew-rated launch vehicle, by 2023 this role has apparently shifted by the under-development Long March 10A.
Unlike older Chinese rockets, CZ-7 does not use hypergolic propellants. The vehicle has two kerolox-fuelled base stages, and uses six YF-100 engines at launch, one each on four boosters and two on the core first stage; the second stage uses four YF-115 engines. The Long March 7A variant, flying from 2020, has a hydrolox third stage powered by two YF-75 engines, inherited from the third stage of the Long March 3B. The rocket has also been developed into the Long March 8 using fewer boosters.