Long March 3B launches military satellite Chinasat-2A

J8II

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A new military communications satellite – the Zhongxing-2A (Chinasat-2A) – was launched by a Chang Zheng-3B (Y17) (Long March 3B) launch vehicle on Saturday. Lift off from the Xichang Satellite Launch Center LC2 launch complex took place at 15:56 UTC.
Chinese Launch:


The Chinasat-2A satellite was built on the DFH-4 platform, with a launch mass around 5,200 kg. It was manufactured by the China Great Wall Industry Corporation (CGWIC).

Due to its military nature, there is little technical information on the satellite. However, China use two types of satellites for secure military communications: the Fenghuo and the Shentong.

The Fenghuo series is used for tactical military communications, providing secured digital data and voice communication to Chinese military forces.
The Chinese are currently operating the DFH-4 based Fenghuo-2 second generation satellite, with the first of the series – the ZX-1A Zhongxing-1A (37804 2011-047A) – launched at 13:33 UTC on September 18th, 2011, by the Chang Zheng-3B (Y16) rocket.

The Shentong geostationary military communication satellites are operated by the Army and their aim is to provide secured voice and data communications services for ground users using Ku-band. The satellite was based on the DFH-3 (Dongfanghong-3) satellite platform that was developed by the China Academy of Space Technology (CAST), having a heavier payload with better reliability and increased power supply.

Chinasat-2A will be the first of a second generation DFH-4 based Shentong-2 satellite in operation.

To meet demand of international satellite launch market, especially for high power and heavy communications satellites, the development of Chang Zheng-3B launch vehicle was started in 1986 on the basis of the fight proven technology of Long March launch vehicles. The Chang Zheng-3B is the most powerful launch vehicle on the Chinese space launch fleet.

Each of the four boosters has a 15.326 meter length with a 2.25 meter diameter, consuming 37,700 kg of N2O4 / UDMH. Equipped with a YF-25 engine capable of a ground thrust of 740.4 kN and a ground specific impulse of 2,556.2 Ns/kg.

The first stage has a 23.272 meter length with a 3.35 meter diameter, consuming 171,800 kg of N2O4 / UDMH. Equipped with a YF-21C engine capable of a ground thrust of 2,961.6 kN and a ground specific impulse of 2,556.5 Ns/kg.

The second stage has a 19.92 meter length with a 3.35 meter diameter, consuming 49,400 kg of N2O4 / UDMH. Equipped with a YF-24E cluster engine with a main engine capable of a vacuum thrust of 742 kN and a vernier engine with a vacuum thrust of 47.1 kN (specific impulses of 2,922.6 Ns/kg and 2,910.5 Ns/kg, respectively).

The third stage has a 12.375 meter length with a 3.0 meter diameter, consuming 18,200 kg of LH2 / LOX. Equipped with a YF-75 engine capable of a vacuum thrust of 167.17 kN and a specific impulse in vacuum of 4,295 Ns/kg.

In recent years, the CZ-3B/E (Enhanced Version) launch vehicle was developed on the basis of CZ-3B, increasing the GTO capacity up to 5,,500kg. The CZ-3B/E has nearly the same configurations with CZ-3B except its enlarged core stage and boosters.

On May 14, 2007, the first flight of CZ-3B/E was performed successfully, accurately sending the NigcomSat-1 into pre-determined orbit. With the GTO launch capability of 5,500kg, CZ-3B/E is dedicated for launching heavy GEO communications satellite.

The CZ-3B and CZ-3B/E launch vehicles are comprised of the vehicle structure, propulsion system, control system, measurement system (telemetry system and tracking & range safety system), propellant management and reaction control system, propellant utilization system, separation system and auxiliary system, etc.

The third stage includes the payload adapter, the vehicle equipment bay (VEB) and the cryogenic propellant tanks and engines. The payload adapter mates the satellite to CZ-3B and bears the mechanical loads. This cargo adapter can be one of the international standard interfaces designated as 937B, 1194 or 1194A. The payload fairings consist of the dome, bi-conic section, cylindrical section, and reverse cone section and separation mechanisms.

This was the 163rd successful Chinese orbital launch, the 163rd launch of a Chang Zheng launch vehicle, the fifth launch from Xichang in 2011 (the 73rd overall from Xichang), and the eighth successful orbital launch for China in 2011.

The Xichang Satellite Launch Centre is situated in the Sichuan Province, south-western China and is the country's launch site for geosynchronous orbital launches.

Equipped with two launch pads (LC2 and LC3), the centre has a dedicated railway and highway lead directly to the launch site. The Command and Control Centre is located seven kilometers south-west of the launch pad, providing flight and safety control during launch rehearsal and launch. The CZ-3B launch pad is located at 28.25 deg. N – 102.02 deg. E and at an elevation of 1,825 meters.

Other facilities on the Xichang Satellite Launch Centre are the Launch Control Centre, propellant fuelling systems, communications systems for launch command, telephone and data communications for users, and support equipment for meteorological monitoring and forecasting.

http://www.nasaspaceflight.com/2012/05/long-march-3b-launches-chinasat-2a/




 
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Godless-Kafir

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Looks like a copy of our GSLV Mk-2 with the 4 boosters and all?

 

cir

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Talking about narcissistic Indians。。。:rofl:
 

shiphone

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somebody really has no common sense or shame?

LM-3B and B/E :GTO: 5.1-5.5 tones @ take off weight: 425-459 Tones
GSLV Mk1,2,3 :GTO: 2-2.5 tones @ TOW 409 tones

LM-3B and B/E : 21 Flights record with 1 failure and 1 partly failure
GSLV Mk1,2,3 :7 Flights record with 4 failure and 1 partly failure

LM-3B and B/E : first flight: 14 February 1996
GSLV Mk1,2,3 :first flight:18 April 2001

CZ-3 (Chang Zheng-3)
---------------------

the retired LM-2E has the similar structure with Strap-on boosters , its first flight took place on 16 July 1990
CZ-2E (Chang Zheng-2E)

 

Dovah

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^^Someone really needs to archive these posts, real face of racist Chicoms :tsk; :tsk:
 

lcatejas

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I don't know why you guys are putting so much effort for saying that Its a copy of Indian GSLV .. Whole world know the synonyms of copy = China. :taunt1:
 

J20!

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Looks like a copy of our GSLV Mk-2 with the 4 boosters and all?

The fact that you think any of your rockets are WORTH copying is amusing. India is waaaaaaaaaaaaaaaaaaaaaaaaaaaaaay behind China when it comes to space, and considering that our rocket is older and more successful, I could argue that you copied us...
 

huaxia rox

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Looks like a copy of our GSLV Mk-2 with the 4 boosters and all?
there r millions of ways u can go funny and u apprently picked the most effective way to do so.....my indian friend....

as a matter of fact although ur GSLV rocket has a copied viking engine as its 2nd stage aka vikas (which is also installed in PSLV) and it uses a russia made cryogenic engine (which is pretty successful in russia but very unsuccessful in india) it still is 1 of the most unsuccessful rocket systems in human history only second to your SLV and ASLV.....of coz south korea and north korea may be the good challengers to over take india in this field if thery cant solve the problems.....

so why prc needs to copy the failure??? we d rather go for the scout but not the SLV rite???
 
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