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2 spacewalks at the same time?



 
 
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  #1  
Old September 14th 06, 03:32 PM posted to sci.space.shuttle
Brian Heil
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Posts: 21
Default 2 spacewalks at the same time?

Anybody know if they have ever considered having 4 spacewalkers
outside on station assembly missions? I'd think the 2 airlocks could
support this without problems (for that matter what stops them from
cycling Quest multiple times?). They managed 3 on STS-49 but I'm
guessing the choreography and communications might be an issue.

It'd be cool to see 4 suits climbing around ISS!
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  #2  
Old September 14th 06, 07:35 PM posted to sci.space.shuttle
Brian Gaff
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Posts: 2,312
Default 2 spacewalks at the same time?

For a start, one lot would have to use Russian suits, as the cycling of the
Quest twice is too complex and if a problem occurred where all needed to
come in, its not big enough!

Note to designers, make bigger airlocks cos the trash they bring in takes up
more room than the crew!

Brian

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"Brian Heil" wrote in message
...
Anybody know if they have ever considered having 4 spacewalkers
outside on station assembly missions? I'd think the 2 airlocks could
support this without problems (for that matter what stops them from
cycling Quest multiple times?). They managed 3 on STS-49 but I'm
guessing the choreography and communications might be an issue.

It'd be cool to see 4 suits climbing around ISS!



  #3  
Old September 14th 06, 10:20 PM posted to sci.space.shuttle
Jeff Findley
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Posts: 5,012
Default 2 spacewalks at the same time?


"Brian Gaff" wrote in message
. uk...
For a start, one lot would have to use Russian suits, as the cycling of
the Quest twice is too complex and if a problem occurred where all needed
to come in, its not big enough!

Note to designers, make bigger airlocks cos the trash they bring in takes
up more room than the crew!


Actually, with the shuttle docked you've got three airlocks available, so
you could see four EMU's and two Orlans climbing around ISS at the same
time. :-)

Why you'd ever want to do this, I have no idea. I'd think there might be
safety issues just due to the "lines of communication". It sounded bad
enough when I was listening in to the last EVA.

Jeff
--
"They that can give up essential liberty to obtain a
little temporary safety deserve neither liberty nor
safety"
- B. Franklin, Bartlett's Familiar Quotations (1919)


  #4  
Old September 15th 06, 09:13 PM posted to sci.space.shuttle
Brian Heil
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Posts: 21
Default 2 spacewalks at the same time?

On Thu, 14 Sep 2006 17:20:58 -0400, "Jeff Findley"
wrote:


"Brian Gaff" wrote in message
.uk...
For a start, one lot would have to use Russian suits, as the cycling of
the Quest twice is too complex and if a problem occurred where all needed
to come in, its not big enough!

Note to designers, make bigger airlocks cos the trash they bring in takes
up more room than the crew!


Actually, with the shuttle docked you've got three airlocks available, so
you could see four EMU's and two Orlans climbing around ISS at the same
time. :-)

Why you'd ever want to do this, I have no idea. I'd think there might be
safety issues just due to the "lines of communication". It sounded bad
enough when I was listening in to the last EVA.


Mostly I was thinking that you could get an extra EVA out of the same
mission duration. Since they rest the EV crewmembers between EVAs
with 2 crews you get 3 EVAs in 3 days. Doing 2 at a time you'd get
the equivalent of 4. 2 crews out first day, day off, same 2 crews out
the second.
You'd probably need an extra IV crewmember and that's probably enough
right there to rule it out - they seem to fill each crewmembers day
pretty completely now.

Not sure if the WVS system would handle 4 crewmembers outside. I'm
guessing the radios might not support it either. Anybody recall what
they did for the 3rd Endeavor spacewalker?

Is the russian suit out of Quest still a going concern?
 




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