Long March 4B
Long March 4B
|
|
| Function | Carrier rocket |
|---|---|
| Manufacturer | CALT |
| Country of origin | China |
| Size | |
| Height | 44.1 metres (145 ft) |
| Diameter | 3.35 metres (11.0 ft) |
| Mass | 249,200 kilograms (549,400 lb) |
| Stages | 3 |
| Capacity | |
| Payload to LEO | 4,200 kilograms (9,300 lb) |
| Payload to SSO | 2,800 kilograms (6,200 lb) |
| Payload to GTO | 1,500 kilograms (3,300 lb) |
| Associated rockets | |
| Family | Long March |
| Derivatives | Long March 4C |
| Launch history | |
| Status | Active |
| Launch sites |
LA-7 & LA-9, TSLC LA-4/SLS-2, JSLC |
| Total launches | 28 |
| Successes | 27 |
| Failures | 1 |
| First flight | 10 May 1999 |
| First stage | |
| Length | 27.91 m |
| Diameter | 3.35 m |
| Propellant mass | 182,000 kg (401,000 lb) |
| Engines | 4 YF-21C |
| Thrust | 2,961.6 kN (665,800 lbf) |
| Specific impulse | 2,550 m/s (260 s) |
| Fuel | N2O4/UDMH |
| Second stage | |
| Length | 10.9 m |
| Diameter | 3.35 m |
| Propellant mass | 52,700 kg (116,200 lb) |
| Engines | 1 YF-24C (1 x YF-22C (Main)) (4 x YF-23C (Vernier)) |
| Thrust | 742.04 kN (166,820 lbf) (Main) 47.1 kN (10,600 lbf) (Vernier) |
| Specific impulse | 2,942 m/s (300.0 s) (Main) 2,834 m/s (289.0 s) (Vernier) |
| Fuel | N2O4/UDMH |
| Third stage | |
| Length | 14.79 m |
| Diameter | 2.9 m |
| Propellant mass | 14,000 kg (31,000 lb) |
| Engines | 2 YF-40 |
| Thrust | 100.85 kN (22,670 lbf) |
| Specific impulse | 2,971 m/s (303.0 s) |
| Fuel | N2O4/UDMH |
The Long March 4B (Chinese: 长征四号乙火箭), also known as the Chang Zheng 4B, CZ-4B and LM-4B is a Chinese orbital carrier rocket. Launched from Launch Complex 1 at the Taiyuan Satellite Launch Center, it is a 3-stage rocket, used mostly to place satellites into low Earth and sun synchronous orbits. It was first launched on 10 May 1999, with the FY-1C weather satellite, which would later be used in the 2007 Chinese anti-satellite missile test.
The Chang Zheng 4B experienced its first launch failure on 9 December 2013, with the loss of the CBERS-3 satellite.
On December 9, 2013, a Long March 4B rocket failed while launching the CBERS-3 satellite. During powered flight of the third stage, one of its two engines shut down prematurely and the satellite failed to reach orbit. The cause was traced to foreign debris that blocked the fuel intake of the engine.
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Wikipedia