China's Space Program News Thread

Discussion in 'Strategic Defense' started by crazyinsane105, Oct 27, 2005.

  1. SinoSoldier
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    SinoSoldier Senior Member

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    First photo of the Tianzhou's accompanying space telescope.
    C4oMXZwVYAQsDun.jpg
    C4oMXZ1VMAALCr_.jpg

    The mirror (Silicon carbide) is 2 meters in diameter and the entire telescope weighs 10 tons (in comparison the Hubble had a 2.4 meter diameter mirror and the James Webb will have a total diameter of 6.5 meters, comprised of multiple mirrors).
     
  2. jon88
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    jon88 New Member
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    James Webb telescope is not optical ..isn't it?
     
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  3. SinoSoldier
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    SinoSoldier Senior Member

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    No; it will focus on longer-wavelength emissions such as IR. Such emissions are thought to be close in resemblance to the early life of the universe.
     
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  4. Hendrik_2000
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    Hendrik_2000 Senior Member

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    Tianzhou 1 resupply space craft video

     
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  5. escobar
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    escobar Senior Member

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    China conducts secretive Debut Launch of Kaituozhe-2 Rocket
    [​IMG]
     
  6. escobar
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    escobar Senior Member

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    Tiankun-1 is the first satellite independently developed by CASIC. CASIC stated after launch that the satellite, work on which started in 2014, carries visible light, infrared, microwave and other remote sensing and communications payloads. Its purposes are related to space debris observation and rapid acquisition of multi-source remote sensing information, and test related to boosting rapid response capability. KT-2:250kg/700km SSO,350kg LEO.
     
  7. escobar
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    escobar Senior Member

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  8. SinoSoldier
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    SinoSoldier Senior Member

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    Although quite dated, the following source is a gold mine for information regarding the development of Chinese solid-fueled rocket motors & its applications.

    http://www.360doc.com/content/16/0514/21/13530469_559158891.shtml

    I'll do a quick recap of the interesting points:
    • A new high-energy propellant, dubbed the N-15, has been widely used, including on the JL-2, DF-41, PL-12, HQ-9A, CZ-11, Kuaizhou, DF-21, DF-31, and other missiles
    • The CZ-6 will be developed into the new CZ-6A variant, with four 2-meter-diameter solid rocket boosters, set to fly between 2017-2020. It will use the same engine found on the Long March 11. (Image below)
    • DF-41 has a range of 14000 km (from a military presentation)
    • JL-2B (possibly another name for the rumored JL-2A?) has a range of 12000 km (from military presentation)
    • New solid rockets (including the CZ-11 & CZ-6A boosters) utilize the CL-20 explosive, widely used across the United States.
    • There are plans to develop the CZ-5B with two large (3.35 diameter) solid boosters rather than use four liquid boosters; this would approximately double its takeoff thrust.
    71742273_2.jpg
    71742273_9.jpg
     
  9. Hendrik_2000
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    Hendrik_2000 Senior Member

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    This type of delivery method can also be used for anti satellite kill vehicle like the US did with pegassus
    Henri K has article on this I will posted next to this article
    China to develop satellite-delivery rockets released from airplanes http://usa.chinadaily.com.cn/china/2017-03/07/content_28456507.htm…
    Like this US trial


    [​IMG]

    China to develop satellite-delivery rockets released from airplanes
    By Zhao Lei | China Daily | Updated: 2017-03-07 07:56[​IMG][​IMG][​IMG][​IMG]
    http://usa.chinadaily.com.cn/china/2017-03/07/content_28456507.htm

    China will develop a new generation of rockets launched from aircraft that can put satellites into space, according to Li Tongyu, the head of carrier rocket development at the China Academy of Launch Vehicle Technology.

    Air-launched rockets can rapidly replace dysfunctional satellites or, in cases of disaster relief, quickly send up Earth observation satellites to assist in the effort, Li said.

    Designers at the academy, which is the main developer of Chinese carrier rockets, have designed a model capable of sending a payload of about 100 kilograms into low Earth orbit and are ready to produce one if the government asks, he said. They plan to design a larger rocket that could carry 200 kg into orbit.

    "The Y-20 strategic transport plane will be the carrier of these rockets. The jet will hold a rocket within its fuselage and release it at a certain altitude. The rocket will be ignited after it leaves the plane," Li said.

    Large satellites will still have to be put into orbit with conventional rockets, experts said.

    Delivery of the Y-20 to the Chinese Air Force began in July. It is China's first domestically developed heavy-lift transport plane and has a maximum takeoff weight of more than 200 metric tons and a maximum payload of about 66 tons, aviation experts said.

    Solid-fuel rockets can be launched from planes much faster than land-based, liquid-fueled rockets, where preparation can take days, weeks or longer, in part because it takes so much time to pump in the fuel, experts said.

    Each mission involving a solid-fuel rocket launched by a Y-20 would take only 12 hours of preparation to place a 200 kg satellite into a sun-synchronous orbit 700 km above Earth, according to estimates by Long Lehao, an academician of the Chinese Academy of Engineering, and other researchers at the China Academy of Launch Vehicle Technology. The estimates were in an article published in October in the Journal of Deep-Space Exploration.

    Other advantages of such rockets are that they are flexible in deployment and use and do not need ground infrastructure, said Pang Zhihao, executive editor-in-chief of Space International magazine. They also are less susceptible to bad weather and launch costs are lower than those of ground-launched rockets, he added.

    The United States undertook the world's first air-launched space mission in 1990, in which a Pegasus rocket developed by the former Orbital Sciences Corp was launched from a refitted B-52 strategic bomber to send two small satellites into orbit. Since then, 43 Pegasus missions have been carried out, with the most recent in December.

    Several US space companies, including Virgin Galactic and Generation Orbit Launch Services, are developing air-launched rockets.

    Chinese designers have been quietly working on the concept for years. China Aerospace Science and Technology Corp, parent of Li's academy, displayed a scale model of a winged, solid-propellant, air-launched rocket in 2006 at the Sixth China International Aviation and Aerospace Exhibition in Zhuhai, Guangdong province.
     
    #4239 Hendrik_2000, Mar 9, 2017
    Last edited: Mar 9, 2017
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  10. Hendrik_2000
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    Hendrik_2000 Senior Member

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    From Henri K
    http://www.eastpendulum.com/y-20-avion-porteur-du-futur-lanceur-aeroporte-chinois
    The Long March family of space launchers may soon be able to welcome a new, rather special, member who will be launched not from a ground shoot but from a Y-20 military transport plane , if we believe in a new Declaration of the aerospace group CASC.

    According to LI Tong Yu, head of the rocket development department of the China Academy of Launch Vehicle Technology (CALT), which is one of the country's leading launchers and ballistic missile manufacturers, will develop a new rocket To launch satellites in orbit.

    "Our engineers have created the model of a rocket capable of placing 100 kg of payloads in low orbit, and it can be manufactured if necessary. "LI told China Daily newspaper," It is planned to develop a larger version, capable of increasing the capacity to 200 kg. ".

    "The rocket will be installed inside the hold of a Y-20 transport aircraft. Once the launch altitude is reached, it will be dropped in flight before continuing on its way alone. "

    [​IMG]
    The model of an airborne CASC launcher exhibited in 2006.

    Knowing that CALT had already exhibited an airborne launcher model in 2006 at the Zhuhai Air Show, but no project was finally launched, one can then wonder if this is an announcement effect - The 5th session of the 12th National People's Congress is being held in Beijing and it is a good opportunity to lobby the MPs - or the issue is really on the table.

    The first element, which shows that maybe this project is actually on track, comes from a framework document published in October 2016 and titled " The Achievement and Future of China Space Transportation System ". This document is co-authored by three people from the CASC group, including academic LONG Le Hao (乐 豪 豪) - chief engineer of the Long Marche launch vehicle family and also deputy chief engineer of the Chinese lunar program.

    In chapter 4.3.2 "Projects under planning", the "airborne launcher" is one of the five models of future launchers - including the CZ-8 , CZ-3D , CZ-3E and CZ super-heavy launcher -9 - that must be developed to supplement the lack capability in space launch of China.

    It reads: "The Y-20 transport aircraft will be the carrier of the future airborne launcher, which will be integrated into the bunker. The launch cycle is 12 hours, and the launcher's carrying capacity is 200 kg or more in 700 km SSO. "

    [​IMG]
    The new members of the Long Marche launch vehicle family, including the airborne launcher (1st left)

    According to the document, China is expected to launch more than 400 spacecraft by 2030, including 20 satellite platforms, three types of lunar probe, two (inhabited) ship models, one space station, and one " Target gear ". But the argument to justify the development of an airborne launcher was not specified in the text, unlike all the other launchers mentioned.

    So what would this first Chinese airborne launcher look like, which will serve as a priori the Y-20 as a carrier-aircraft?

    For this purpose, we will draw on a few academic documents published between 2007 and 2013, to follow the research that has been carried out so far and to try to understand the operational need behind it.

    [​IMG]
    Configuration of the airborne launcher selected until 2008

    In October 2007, a researcher and her two colleagues working at the Beijing Institute of Space System Engineering, a subsidiary of CALT, published a paper on multidisciplinary optimization of the design of an airborne launcher.

    It is thus known that until that date, CALT was still considering designing a launcher hanging on the outside of its aircraft-carrier, hence the presence of a wing on the body of the rocket, like the American launcher Pegasus . It will also be noted that the illustration (see above) of the craft in the document bears the insignia of the Chinese army on the empennage.

    As of 2008, research appears to have taken a different direction, towards a launch configuration whose satellite launcher will be dropped from the inside of the aircraft's hold. Indeed, the University of Engineering of the Chinese Air Force and the North West Polytechnic University - both very involved in the development of armaments projects - have launched joint studies on separation Of the airborne launcher of the cargo hold of its carrier.

    [​IMG]
    Two ways to drop an airborne launcher.

    Researchers at these two Chinese universities have created simulations to study two types of dropping - the head or tail of the launcher that comes out of the cargo bay first - while citing the US Air Force's experiments with the C-17A . Computer simulation of drops occurs at an altitude of 10,000 meters when the carrier aircraft flies at a speed of Mach 0.75.

    The conclusion of the simulations shows that even if there are a few more technical difficulties in releasing the airborne launcher by putting the rear part out of the hold first, the launcher will lose less altitude and less speed and l Angle of incidence will also be lower. This will help to improve the carrying capacity of the launcher.

    In January 2011, the same teams of the two Chinese universities again published a study, this time on the longitudinal disturbance during the launch of airborne launcher, indicating that the research in this direction continued and was mainly deepened.
     
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