China's Space Program News Thread
- Thread starter crazyinsane105
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University spinouts are common. It is private company. Even ARM got help from Cambridge and Apple.
I just watched a new documentary on CCTV-9 called 《你好！火星》. The first episode is on Youtube now.
The episode I watched is not yet on Youtube, so follow the Youtube channel if you are interested.
In this episode, the purpose of this wing/rudder was explained. I think it was also discussed in this forum years ago. Anyway, it is to keep the lander in balance during entry.
During entry the axis of the spacecraft is at an angle to the trajectory (AOA) to create lift. But to deploy the parachute, AOA must be reduced to 0. The rudder is for this purpose. The total mass of this device is 15kg.
Here comes the funny thing. NASA was requesting for proposals (RFP) to replace the eject-able balancing mass of 300kg dead weight for the same purpose.
In NASA's lander, 150kg (2 x 75kg) dead weight will be ejected at the beginning of the re-entry, then another 150kg (6 x 25kg) will be ejected before the parachute deployment. The request for proposal is to somehow make use of these mass.
I have not found the result of the RFP. But according to the CCTV documentary, there was 150kg dead weight ejected. So maybe NASA found use of 150kg. Anyway, there is 300kg mass that isn't part of the lander. It is very astonishingly lack of competence and then "patch on patch".
The episode I watched is not yet on Youtube, so follow the Youtube channel if you are interested.
In this episode, the purpose of this wing/rudder was explained. I think it was also discussed in this forum years ago. Anyway, it is to keep the lander in balance during entry.
During entry the axis of the spacecraft is at an angle to the trajectory (AOA) to create lift. But to deploy the parachute, AOA must be reduced to 0. The rudder is for this purpose. The total mass of this device is 15kg.
Here comes the funny thing. NASA was requesting for proposals (RFP) to replace the eject-able balancing mass of 300kg dead weight for the same purpose.
I have not found the result of the RFP. But according to the CCTV documentary, there was 150kg dead weight ejected. So maybe NASA found use of 150kg. Anyway, there is 300kg mass that isn't part of the lander. It is very astonishingly lack of competence and then "patch on patch".
broadsword
Brigadier
Is rocket a problem?
You mean the launcher Atlas V 541? No, it is not a problem. I would guess that NASA is much less competent in area of hyper sonic, high temperature aerodynamics. So NASA is not able to use rudders or fins. This is another evident of why US is behind China in DF-17 and accurately predict its space capsule's landing location (comparing Shenzhou and Dragon). Both technology relies on the same science.
Seems like a huge leap in logic.
broadsword
Brigadier
No, I was referring to the use of deadweight for balancing. Can't rockets do the job? Is the momentum of descent too much?
Do you have data on shenzhou and crewdragon landing accuracy? Can only imagine China's next gen spacecraft would be even better than shenzhou.
Since they've tested the next gen spacecraft twice already, is there data on that? In any case Landers on other planets would be different again. The Chinese one certainly did that better.
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