Яогань-30-05 (3 КА - A, B, C) / Yaogan-30-05 - CZ-2C - Сичан (XLSC), LC3 - 26.07.2019, 03:57 UTC

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Обнаружен 4-й объект запуска0 TBA - TO BE ASSIGNED
1 44452U 19045D   19208.75050618 -.00000650  00000-0 -28824-4 0  9991
2 44452  34.9805 328.5156 0103313  56.3001  62.8468 15.13634267    20
44452 / 2019-045D : 454 x 596 km x 34.98°, 95.13 min


Цитировать Andrew Jones‏ @AJ_FI 41 мин. назад
Grid fins on the Chinese Long March 2C that launched 3 reconnaissance satellites on Friday. CASC claims they helped more precisely define the 1st stage drop zone & lower chance of damage downrange. Also a step towards reusable launchers. https://mp.weixin.qq.com/s/brJRqR17XYfnR1HdKSREfA ...


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ЦитироватьChina successfully tests accurate landing of rocket debris
Source: Xinhua | 2019-07-29 00:06:36 | Editor: yan

BEIJING, July 28 (Xinhua) -- China has successfully tested the technology that can accurately control the landing site of falling rocket parts, making progress toward reusable launch vehicles in the future, China Aerospace Science and Technology Corporation (CASC) said on Sunday.

The CASC said that the test was carried out following a Long March-2C rocket launched on Friday, and focused on grid fins which are like "wings" on rocket core part to increase precision in control of its landing location.

According to experts from the CASC, the rocket' flight trajectory is designed to avoid densely populated areas. But after completing the mission, the rocket debris falls under no control with a wide range of landing points which sometimes involve inhabited areas.

In order to ensure the safety of people's lives and property, the currently practice is to evacuate people to the safety zone before each mission, which is not only inconvenient for the local people, but increases the cost and task difficulty.

The success of the test is of great significance for improving China's inland rocket landing safety, minimizing the inconvenience to the local people, as well as promoting the follow-up development of carrier rockets' controllable recovery, soft landing and reuse, according to He Wei, an official with the CASC.

"The swinging grid fins were used to control the rocket debris' direction and attitude, much like the wings of the debris," said Cui Zhaoyun, the deputy chief designer of Long March-2C rocket. The landing site control of large and medium rockets is much more difficult than that of small rockets, he added.



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ЦитироватьChinese Long March launch tests grid fins for safely, future reusability
by Andrew Jones — July 30, 2019

The Long March 2C at Xichang Satellite Launch Center. Credit: China Academy of Launch Vehicle Technology

HELSINKI — Launch of a Long March 2C from Xichang last week included a first use of grid fins by China to minimize the threat posed by the spent first stage to populated areas downrange.

The two-stage hypergolic Long March 2C lifted off at 11:57 p.m. Eastern July 25 carrying three Yaogan-30 (group 5) satellites into a roughly 600 kilometer orbit inclined by 35 degrees. With few details available, outside observers state that the satellites are likely for reconnaissance use by the People's Liberation Army.

Gaining more attention was the fact that the interstage section of the launch vehicle, colored gray above and attached to the first stage, included four grid fins with apparent resemblance to those used to guide SpaceX Falcon 9 and Falcon Heavy boosters back to landing areas.

The China Aerospace Science and Technology Corporation (CASC), the main contractor for China's space programs, stated in a post-launch statement that the stage fell within the designated zone in prefectures within Guizhou province. Footage of first stage falling to Earth in a densely vegetated area was also released on social media.

The test comes in apparent response to increased awareness and visibility of spent boosters falling downrange near populated areas and increased launch activity. Three of China's four national launch centers were established during the Cold War, with tensions with the United States and Soviet Union prompting the decision for the sites to be located far inland for security reasons. Despite careful rocket flight path design and safety measures on the ground, spent boosters have frequently fallen among towns and villages downrange from Xichang, sometimes damaging property.

According to CASC, a team of one dozen members with an average age of under 35 carried out the research and development of the grid fins, which needed to be able to unlock, extend and rotate while also resisting high temperatures and pressures.

CASC stated that the grid fins successfully helped ease safety concerns by allowing a hard landing within a smaller drop zone, reducing both the need for evacuation of populated areas and hence inconvenience to locals and launch costs.

Additionally CASC states that the breakthrough is of major significance to Chinese aerospace and is a step toward controlled descent and landings which could lead to reuse of rocket stages.

The grid fins on the Long March 2C. Credit: CASC



Работа рулей. Видео проживёт недолго.


Видео (1:12)

Upd. Появилась копия на ТыТрубе
ЦитироватьLong March 2C carrying YaoGan-30-05 views of gridfin operations CCTV

Oblate Spheroid Society

Опубликовано: 3 авг. 2019 г.
https://www.youtube.com/watch?v=RzAh5WliucIhttps://www.youtube.com/watch?v=RzAh5WliucI (1:25)


Новостной сюжет ТВ КНР (на ТыТрубе)
ЦитироватьLong March 2C carrying YaoGan-30-05 views of gridfin operations CCTV

Oblate Spheroid Society

Опубликовано: 3 авг. 2019 г.
https://www.youtube.com/watch?v=iTqxcZt0o1Yhttps://www.youtube.com/watch?v=iTqxcZt0o1Y (10:01)


Официальное видео ТВ КНР

ЦитироватьVideo Released Showing Accurate Landing of China's Rocket Debris

CCTV Video News Agency

Опубликовано: 4 авг. 2019 г.

The video showing China's successful test of accurate control of landing site of falling rocket parts, was unveiled on the China Central Television on Tuesday.

The successful test marks that China has become the second country mastering such technology after the United States.
https://www.youtube.com/watch?v=NeqJgKudNlUhttps://www.youtube.com/watch?v=NeqJgKudNlU (1:44)