China's Space Program Thread II

PiSigma

PiSigma

"the engineer"
jli88 said:
But Musk has done enough feats which earlier scoffed at and dismissed off hand, for him to be taken seriously. Even if he undershoots by 24x, it is still 1 launch of starship a day (which is very easily feasible), implying over 36,500 tonnes of mass to orbit.

What if this is used to place say 35,000 tonnes of stainless steel rods (that are able to survive reentry, and have a terminal speed of 10 Mach) in orbit?
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The best stainless steel melts at 1500C. Re-entry to earth is around 2000-3000C.

And why does it need to be stainless? You need oxygen and water to rust steel, neither exist in space.

They need high melting point metal like tungsten to make sense. Tungsten melts at over 3000C. But guess what tungsten is mostly from China.
 
J

jli88

Junior Member
Registered Member
PiSigma said:
The best stainless steel melts at 1500C. Re-entry to earth is around 2000-3000C.

And why does it need to be stainless? You need oxygen and water to rust steel, neither exist in space.

They need high melting point metal like tungsten to make sense. Tungsten melts at over 3000C. But guess what tungsten is mostly from China.
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How is spacex using stainless steel for its booster and second stage re-entry then? Apparently, the temperature doesn't rise to that much due to reflection and radiative heat dissipation from stainless steel.
 
PiSigma

PiSigma

"the engineer"
jli88 said:
How is spacex using stainless steel for its booster and second stage re-entry then? Apparently, the temperature doesn't rise to that much due to reflection and radiative heat dissipation from stainless steel.
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Booster doesn't get that high. Atmospheric re-entry temperature will go between 1500-3000c depending on the how far into the atmosphere you are and the velocity. It's basically determined by density of air resistance and velocity. So higher up less air, less auto ignition of molecules.

For the booster it would be starting at Okm/h basically, where as a space shuttle or the rods of God would have a much higher starting velocity at the same point of the atmosphere.
 
B

bebops

Junior Member
Registered Member
The Yaogan 47 satellite has unrivaled capabilities compared to past ones and lens as wide as Hubble. Does anyone know how this satellite going to be used in a conflict and what capabilities it has
 
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