China's Space Program Thread II
- Thread starter Blitzo
- Start date
Surprised that only Galactic energy launches regularly its solid rocket among all private space companies in China. The private players have been abit of a dissapointment to be honest. I thought that by 2025 after 11 years of china opening up space industry to private players that there will be a couple of them launching at least this types of small rockets with small satellites very regularly and casually by now. I'm surprised only galactic energy has been the only one capable and willing to regularly launch such rockets. Hopefully their transition to heavier rockets and payloads with their Pallas series will be smoother than her competitiors.A Ceres-1 rocket successfully launched three satellites into space: Kaiyun-1, Yuxing-03 08, and Yunyao-1 27. This was the 21th flight of the Ceres-1 launch vehicle.
They are doing ok. I just question the need for this many of them. So many people doing launchers and comparatively few doing satellites. I hope they won't have a dozen or half a dozen of these companies doing superheavies down the line.
The Energia and Apollo helped bankrupt the Soviet Union and the US.
The Energia and Apollo helped bankrupt the Soviet Union and the US.
My speculation was that the satellites are likely part of a constellation of China, they are made by Sputnix for Chinese customers, so they are not really Russian domestic. My thought is based on the fact that these satellites are small satellites for broadband, Russia is good in making the platform but not in digital chips in baseband, nor miniturized radio chips and TR modules in things like 5G base stations where China is the world leader. So it is a cooperation that put Russian expertise in good use. Since the final (program) owner is Chinese one, choosing a Chinese launch provider has nothing to do with Roscosmos' launch capability or price.
Regulation of exporting Russian space product to China should have been established long ago. There were multiple occations in the past decade that Sino-Russo space cooperation were highlighted in joint statemens/summit between the presidents.
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oh boy, China is going to test its planetary/asteroid defense against a small satellite
I wonder how big are the instrument here. Can this be re-usable against the asteroids produced by SpaceX?
They are going to get close and collide into it.....
I wonder how big are the instrument here. Can this be re-usable against the asteroids produced by SpaceX?
So LandSpace currently has two ZQ-3 in final assembly, they’re making rapid progress.
backwindow
New Member
small satellite -> asteroid
I remember someone asked about the risk of engine nozzle blowing up moon dust that may damage Lanyue lander's engine while referring Apollo's ascent module engine is protected by the dscent module.
Here is a comparison.
Apollo's dscent engine is about kneel high (0.5 metre) to the surface, it is also 47KN which is more than 6 times powerful than Lanyue's 7500N engine (X4), or 1.6 times of Lanyue's total thrust. So Apollo lander certainly blew up lots of dust (at thousands metres per second) that put the engine in risk. Dust blown up by Lanyue's 4 smaller engine will be less than single engine of same total thrust because the dust spreads out in a larger area because of its travel trojectory. The four engines are also mounted about 1.8 metres higher than apollo using the astronout as a reference. This is more than 2 metres from the surface, dust does not reach this hight according to a research paper on the dust flow of Chang'e 5 mission "The nozzle plume erosion property on lunar dust in Chang’E-5 mission"
Another thing to remember is that Lanyue is very different from Apollo, it uses a dedicated deceleration module to do the main job just before some kilometre above the surface then discard it, the lander will use smaller engines to land and ascent as one piece. Apollo has the descent module (more than half of the weight to reach the surface) reach the surface. So Lanyue's crew space should be much bigger than Apollo (the ascent module).
Overall, China's moon landing is similar in weight class to Apollo program. China sends 26+26=52 tonnes to LLO, Apollo had 50 tonnes. China dumps the major mass of landing complex before reaching the surface while Apollo had bigger mass to reach the surface and half of it becamed dead weight. It is analog to rocket launching, China does an earlier staging, Apollo did a late staging, the difference is China has a higher useful payload to the surface while Apollo has higher weight on surface.
Here is a comparison.
Apollo's dscent engine is about kneel high (0.5 metre) to the surface, it is also 47KN which is more than 6 times powerful than Lanyue's 7500N engine (X4), or 1.6 times of Lanyue's total thrust. So Apollo lander certainly blew up lots of dust (at thousands metres per second) that put the engine in risk. Dust blown up by Lanyue's 4 smaller engine will be less than single engine of same total thrust because the dust spreads out in a larger area because of its travel trojectory. The four engines are also mounted about 1.8 metres higher than apollo using the astronout as a reference. This is more than 2 metres from the surface, dust does not reach this hight according to a research paper on the dust flow of Chang'e 5 mission "The nozzle plume erosion property on lunar dust in Chang’E-5 mission"
Another thing to remember is that Lanyue is very different from Apollo, it uses a dedicated deceleration module to do the main job just before some kilometre above the surface then discard it, the lander will use smaller engines to land and ascent as one piece. Apollo has the descent module (more than half of the weight to reach the surface) reach the surface. So Lanyue's crew space should be much bigger than Apollo (the ascent module).
Overall, China's moon landing is similar in weight class to Apollo program. China sends 26+26=52 tonnes to LLO, Apollo had 50 tonnes. China dumps the major mass of landing complex before reaching the surface while Apollo had bigger mass to reach the surface and half of it becamed dead weight. It is analog to rocket launching, China does an earlier staging, Apollo did a late staging, the difference is China has a higher useful payload to the surface while Apollo has higher weight on surface.
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China has been known for being good in mass production and scaling up quickly. Is there any reason why China hasnt been able to scale up rocket and satellite building as much as in other sectors?