Long March 4B

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Long March 4B
Long March 4B
Function Carrier rocket
Manufacturer CALT
Country of origin  People's Republic of China
Height 45.8 metres (150 ft)[1]
Diameter 3.35 metres (11.0 ft)[1]
Mass 249,200 kilograms (549,400 lb)[1]
Stages 3
Payload to
4,200 kilograms (9,300 lb)[2]
Payload to
2,800 kilograms (6,200 lb)[2]
Payload to
1,500 kilograms (3,300 lb)[2]
Associated rockets
Family Long March
Derivatives Long March 4C
Launch history
Status Active
Launch sites LC-7 & LC-9, TSLC
Total launches 24
Successes 23
Failures 1
First flight 10 May 1999
First stage
Engines 4
Thrust 2,961.6 kN
Specific impulse 2550 m/s
Burn time
Fuel N2O4/UDMH
Second stage
Engines 1
Thrust 788.13 kN
Specific impulse 2942 m/s
Burn time
Fuel N2O4/UDMH
Third stage
Engines 2
Thrust 100.848 kN
Specific impulse 2971 m/s
Burn time
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 Centre, 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.[3]


  1. ^ a b c Mark Wade. "CZ-4B". Encyclopedia Astronautica. Retrieved 2008-04-27. 
  2. ^ a b c Gunter Krebs. "CZ-4B (Chang Zheng-4B)". Gunter's Space Page. Retrieved 2008-04-27. 
  3. ^ Boadle, Anthony. "China-Brazil satellite launch fails, likely fell back to Earth". Reuters. Retrieved 10 December 2013.