The Syrian airfield prepare for reception of military aircraft of China
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LONG MARCH 4 (CZ-4)
The Long March 4 was developed to fly meteorological satellites (the Feng Yun 1 series) into polar orbit from the new launch site of Taiyuan. It was built in the same plant that designed and constructed the Feng Bao in Shanghai, providing it with much-needed replacement work. As was the case with the Long March 3, it was a derivative of the first two stages of the Long March 2, but with a totally new third stage and engines (YF-40). For the CZ-4, Chinese rocket designers stretched the
|
CZ-2C |
CZ-2D |
CZ-2F |
|
|
Height |
40 m |
38.3 m |
58.34 m |
|
Diameter |
3.35 m |
3.35 m |
3.35 m |
|
Weight |
213 tonnes |
237 tonnes |
479.8 tonnes |
|
Thrust |
2,960 kN |
2,962 kN |
5,923 kN |
|
Strap-ons |
Engines: 4 x YF-20B Length: 15.33 m Mass: 41 tonnes |
||
|
First stage |
Engine: 4 x YF-20A Length: 23.72 m Mass: 151.55 tonnes Thrust: 284 tonnes Bum: 130 sec |
Engine: 4 x YF-20B Length: 24.92 m Mass: 187.7 tonnes Thrust: 302 tonnes Burn: 154 sec |
Engine: 4 x YF-20B Length: 23.7 m Mass: 196 tonnes Thrust: 326 tonnes Bum: 166 sec |
|
Second stage |
Engine: YF-24 Length: 8.387 m Mass: 38.5 tonnes Thmst: 73.2 tonnes |
Engine: YF-24B Length: 7.92 m Mass: 38.5 tonnes Thrust: 80 tonnes |
Engine: YF-22 Length: 15.52 m Mass: 91.5 tonnes Bum: 295 sec |
|
Capability |
2,800 kg to 300 km orbit |
3,400 kg to 200 km |
7,600 kg to 330 km |
|
Note: This and the two subsequent tables use a number of official sources for these details. There are minor variations in the technical information provided, so this is the most representative selection. |
CZ-2C first stage by 4 m and the second stage by 3 m. Introduced in 1988, it flew only twice and was replaced 10 years later by an improved version, the Long March 4B, which put the third polar weather satellite into orbit (Feng Yun 1-3) with the small scientific satellite Shi Jian 5. Since then, it has been used for applications missions such as China Brazil Earth Resources Satellite (CBERS) and Zi Yuan. The Long March 4B used a more powerful, restartable third stage, with a 3% greater thrust level and longer burn time. Its capacity is 4.2 tonnes to low Earth orbit or 2.8 tonnes to polar orbit. The 4B is slightly taller on the pad – 44.1 m compared to 41.9 m.
The CZ-4C was introduced on Yaogan 3 on 12th November 2007, the new rocket having a multiple restart upper stage, a structural rung between the first two stages, and a new shroud (many Western records give Yaogan 1 as the first flight of the CZ – 4C, but the official source of the day gave it the 4B). The restartable upper stage would give China the ability to reach higher orbits more precisely while the structure would enable it to carry heavier payloads. Details are given in Table 3.6.
|
CZ-3A |
CZ-3B |
CZ-3C |
|
|
Height |
52.52 m |
54.838 m |
54.838 m |
|
Diameter |
3.35 m |
3.35 m |
3.35 m |
|
Weight |
241 tonnes |
427.3 tonnes |
345 tonnes |
|
Thrust |
2,962 kN |
5,923 kN |
4,440 kN |
|
Strap-ons |
Engine: 4 x YF-20B Length: 15.326 m Mass: 41.2 tonnes Thmst: 305 tonnes Bum: 125 sec |
Engine: 2 x YF-20B Length: 15.326 m Mass: 41 tonnes Thrust: 302 tonnes Burn: 127 sec |
|
|
First stage |
Engine: 4 x YF-21B Length: 26.972 m Mass: 182.83 tonnes Thrust: 296.16 tonnes Bum: 146 sec |
Engine: 4 x YF-21B Length: 23.272 m Mass: 180.3 tonnes Thmst: 302 tonnes Bum: 146 sec |
Engine: 4 x YF-21B Length: 26.972 m Mass: 179 tonnes Thrust: 326 tonnes Burn: 155 sec |
|
Second stage |
Engine: 4 x YF-24B Length: 7.826 m Mass: 34.963 tonnes Thrust: 73.2 tonnes Bum: 110 sec |
Engine: YF-24B Length: 9.943 m Mass: 55.6 tonnes Thmst: 73.2 tonnes Bum: 185 sec |
Engine: YF-22 Length: 9.47 m Mass: 55 tonnes Thmst: 76 tonnes Burn: 190 sec |
|
Third stage |
Engine: 2 x YF-75 Length: 8.835 m Mass: 21.257 tonnes Thrust: 16 tonnes Bum: 480 sec |
Engine: 2 x YF-75 Length: 12.375 m Mass: 21.7 tonnes Thmst: 16 tonnes Bum: 470 sec |
Engine: 2 x YF-75 Length: 12.38 m Mass: 21.257 tonnes Thrust: 15.6 tonnes Burn: 480 sec |
|
Capability |
2.6 tonnes to GTO |
5.5 tonnes to GTO |
3.9 tonnes to GTO |