China's Space Program News Thread

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taxiya

Brigadier
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我国进行了重型火箭25吨级膨胀循环氢氧发动机首台推力室挤压试验,试验取得圆满成功

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Combustion chamber of third stage engine for CZ-9 (11) was tested. The engine is 25 tonne force thrust, expander cycle. Two tests were done at 60% and 100% thrust. The tests did not involve the expansion of LH and LO, only the combustion chamber. LH and LO were fed by compression. It is ready for full system test.

There is a statement "该型发动机是目前世界推力最大的膨胀循环氢氧上面级发动机"/This engine has the highest thrust among expander cycle. I know why it is claimed to be so. Just curious if anyone is going to reject that on what definition. ;)
 
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Xizor

Captain
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It seems to me that all critical technologies of CZ-9(11) have been tested. All engines have passed critical stages. With 8 years ahead, CZ-9(11)'s maiden flight before 2030 is almost certain.
Why wait 8 years if all critical technologies have been tested? Why not have the maiden flight in five years ?
 

iantsai

Junior Member
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北京时间2021年12月23日18时12分,我国在文昌发射场用长征七号改运载火箭,成功将试验十二号卫星01星、02星发射升空,卫星顺利进入预定轨道,发射任务获得圆满成功。
Shiyan-12/01 and 02 dual experimental satellites were successfully orbited by a three-stage CZ-7A rocket in Wenchang Satellites Launching Center, Hainan at 18:12 UTC+8, Dec 23.

It's the third CZ-7A launch mission, 51th China launch in 2021, and 402th CZ series mission.

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taxiya

Brigadier
Registered Member
Why wait 8 years if all critical technologies have been tested? Why not have the maiden flight in five years ?
YF-130 has not conducted full thrust and full system test. YF-90 only half system test, not the combustion chamber. This 25t engine is also half tested. The tank hasn't be made and pressure tested. All of them need not only full test, but also accumulate enough test times of tenths of thousand seconds.

8 is the maximum time there is between now and end of 2030. I was not making an estimation of the exact earliest date of maiden flight. Rather saying that there is enough time to meet the deadline. On the other hand 5 years could be possible if everything runs smooth, but we know very often that is not the case.
 
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