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Old May 3rd 17, 10:30 AM posted to sci.space.policy
Fred J. McCall[_3_]
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Default NASA Announces SLS/Orion Flight Slide

JF Mezei wrote:

On 2017-05-02 02:37, Fred J. McCall wrote:

Because ACES suits don't exist anymore and there are precisely 11 ISS
EMUs and I wouldn't want to spend 8 days in a suit with a max 8 hour
duration.


So, on Soyuz, Apollo and Shuttle, first thing after launch is get out of
the launch suits and spend rest of trip in shirt sleeve clothing until
you don the launch/re-entry suits again just before re-entry.


Not fully true, but whatever. You do like to compare apples and
aardvarks, don't you?


But on Orion, you claim the crews will need to stay in pressure suits
the whole way?


Do I need to kick you in the ass to dislodge your head, because it
seems to be stuck up there?

Hypothetical: Your spacecraft suffers a decompression incident
halfway to the Moon. What do you do? Remember, this is a vehicle
that has NEVER flow full up and has NEVER flown crewed.

Soyuz suits are good for a bit over two hours. If a Soyuz suffers
decompression they MUST land within that two hours.

ACES is good for 10 minutes. It assumes you're plugged into vehicle
life support systems. Note that Shuttle astronauts didn't wear suits
at all inside the vehicle until after Challenger.

If you didn't have the EVA backpack or an umbillical, the Apollo suits
were good for 30 minutes. The EVA backpack was good for seven hours.


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