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Fog during starship testing



 
 
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Old May 8th 20, 01:25 PM posted to sci.space.policy
Dean Markley
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Default Fog during starship testing

On Thursday, May 7, 2020 at 3:07:10 PM UTC-4, JF Mezei wrote:
I have watched some of the live videos of the Starship SN4 fueling and
the short tests.

Truying to understand the huge amount of fog that is created to the left
of the rocket near the various tanks.

Is this actual venting of O2, or is it just a case of when they start to
move fuel from the liquid tanks to the SN4, those tanks gets cold as the
liquid starts to boil, and that causes humid ambiant air near ocean to
create fog?

On the live videos the guys were saying it was venting. But I am puzzled
on why an infrastructure capale of keeping O2 pressurized at room
temperature during the day would suddently need to vent when they start
to let some liquid escape in pipes to the rocket ?


Also, to the right of the rocket was a methane flame.

Is this a vent from the SN4 back to ground where it can safely be burned
away from rocket (but conveniently within frame of BocaChica Girl'd
camera to make a good show) or is this methane that is burned off from
groiund infrastructure? In the later case, how come they don't need to
burn it when not testing, but they need to burn it when testing?



If Starship is meant to be able to keep liquid methane and liquid oxygen
in its tanks for long duration at room temperature, why would they need
to vent?


Have you considered asking SpaceX?

 




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