Long March 4B

Long March 4B

Rendering of Long March 4B
Function	Launch vehicle
Manufacturer	SAST
Country of origin	China
Cost per launch	US$50 million (2006) [1]
Size
Height	44.1 m (145 ft)[1]
Diameter	3.35 m (11.0 ft)[2]
Mass	249,200 kg (549,400 lb)[2]
Stages	3
Capacity
Payload to LEO
Mass	4,200 kg (9,300 lb) [3]
Payload to SSO
Mass	2,800 kg (6,200 lb)[3]
Payload to GTO
Mass	1,500 kg (3,300 lb)[3]
Associated rockets
Family	Long March
Derivative work	Long March 4C
Launch history
Status	Active
Launch sites	Taiyuan, LA-7 and LA-9 Jiuquan, LA-4/SLS-2 Xichang, LA-3
Total launches	52
Success(es)	51
Failure(s)	1
First flight	10 May 1999
Last flight	13 November 2024
First stage
Height	27.91 m (91.6 ft)
Diameter	3.35 m (11.0 ft)
Propellant mass	182,000 kg (401,000 lb)
Powered by	4 YF-21C
Maximum thrust	2,961.6 kN (665,800 lbf)
Specific impulse	2,550 m/s (8,400 ft/s)
Propellant	N2O4 / UDMH
Second stage
Height	10.9 m (36 ft)
Diameter	3.35 m (11.0 ft)
Propellant mass	52,700 kg (116,200 lb)
Powered by	1 YF-24C (1 x YF-22C (Main)) (4 x YF-23C (Vernier))
Maximum thrust	742.04 kN (166,820 lbf) (Main) 47.1 kN (10,600 lbf) (Vernier)
Specific impulse	2,942 m/s (9,650 ft/s) (Main) 2,834 m/s (9,300 ft/s) (Vernier)
Propellant	N2O4 / UDMH
Third stage
Height	14.79 m (48.5 ft)
Diameter	2.9 m (9 ft 6 in)
Propellant mass	14,000 kg (31,000 lb)
Powered by	2 YF-40
Maximum thrust	100.85 kN (22,670 lbf)
Specific impulse	2,971 m/s (9,750 ft/s)
Propellant	N2O4 / UDMH
[edit on Wikidata]

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 expendable orbital launch vehicle. Launched from Launch Complex 1 at the Taiyuan Satellite Launch Center, it is a 3-stage launch vehicle, used mostly to place satellites into low Earth orbit and Sun-synchronous orbits. It was first launched on 10 May 1999, with the FY-1C weather satellite, which would later be the target in the 2007 Chinese anti-satellite missile test.

The Chang Zheng 4B experienced its only launch failure on 9 December 2013, with the loss of the CBERS-3 satellite.^[4]

Number of launches, by year.

• Long March 4C
• Long March (rocket family)
• Medium-lift launch vehicle