ST Alpha - "Good explanation on why the window for launch is instantaneous." (Reading a Post)

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Good explanation on why the window for launch is instantaneous.

Posted by TWuG May 27 '20, 13:48

The liquid oxygen needs to stay at a certain temp to provide the correct propulsion numbers. If they load but then can't launch at T-0 they have to unload the prop because it will get too warm and then they have to reload properly cooled LOX. In the time it takes to do that, the ISS moves out of where it needs to be for the capsule to reach it.

Responses:

So by design all ISS missions will be instantaneous windows? - spamlet May 27, 13:49 4
- Not necessarily. This is a Falcon 9 thing. There could be other launch vehicles. The Falcon 9 uses supercooled liquids for better efficiency - JD May 27, 13:55
- Yes. Orbital mechanics mean that the ISS is only in the right area in relation to the launch pad briefly. - TWuG May 27, 13:53 2
  - Right but with traditional propellants they can wait out a small delay. -- nm - spamlet May 27, 13:55 1
    - Will solid rockets, yes. Not sure you get more traditional than LOX and RP1 -- nm - TWuG May 27, 13:57
add turbo -- nm - Max May 27, 13:49

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Good explanation on why the window for launch is instantaneous.

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