China's Space Program Thread II

[Maikeru]

Once again, there is no place for "look funny, or look nice" in science and technology.

Solid booster's diameter determines burn time, length determins thrust. It's is determined by technical reasons (number of stages, thrust/mass ratio, payload mass etc.) and can not be changed to look "nice".

Surely the other way around? length = burn time, diameter = thrust?

 

[taxiya]

Surely the other way around? length = burn time, diameter = thrust?

No.

The fuel is burnt through an internal specially shapped chamber all the way from the bottom to the top, the longer it is the more combustion the more thrust.

The fuel is burnt at the surface of that internal chamber outwardly, therefor the larger diameter the longer time it burns.

See the illustration

 

[by78]

Tianzhou-7 cargo spacecraft is being transferred to the launchpad. The launch will likely take place on the 17th or 18th per a public notice on traffic restrictions around Wenchang.

 

[by78]

A dust storm at Martian south pole. Image taken on Sep 26, 2022 by Tianwen-1 orbiter.

 

[no_name]

No.

The fuel is burnt through an internal specially shapped chamber all the way from the bottom to the top, the longer it is the more combustion the more thrust.

The fuel is burnt at the surface of that internal chamber outwardly, therefor the larger diameter the longer time it burns.

See the illustration
View attachment 123878

So roughly like a gun barrel then the longer the length the more acceleration at the end.
You can somewhat alter the burn time/profile by using different internal chamber cross sections, like star instead of circular to have more surface area, etc.

 

[escobar]

View attachment 123028

Yaogan-41 (the other sat in the pic) is being approached and will likely maneuver out of the way

YG-41 5° inclination will periodically bring it closer to Taiwan...

 

[gpt]

Interesting piece from 2018

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Gaofen-11s apparently have a 8-10cm resolution (think US Keyhole) and there is now 4 of them
These as well as future LEO and VLEO imaging sats likely can 'coordinate' with geosynchronous ones by receiving data from them and then quickly maneuvering over an area of interest to get a better shot




I don't have a 0.1m resolution image lol but its clearer than this (taken from an ESA Sentinel-2)

 

[by78]

Tianzhou-7 will carry 90kg of fresh fruit to the Chinese space station.

 

[by78]

High-resolution images of Tianzhou-7 cargo spacecraft and its launch vehicle being transferred to the launchpad.

 

[by78]

The 8th academy of CASC has developed an automated welding process for docking rings, which has effectively improved productivity and reduced welding accuracy.