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number of layers in Apollo, ISS spacesuit ?



 
 
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  #1  
Old July 8th 06, 12:04 PM posted to sci.space.history
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Default number of layers in Apollo, ISS spacesuit ?


Hi,

Could someone help be to find the correct version ?

I read at http://en.wikipedia.org/wiki/Extrave..._Mobility_Unit
that the apollo EVA suit was made of 21 layers. It is the first time I read
this.
Most websites tell that the A7L suit used for EVA during the moon missions
had only 7 layers
Question : what suit used Apollo crew during EVA ? An A7L made of 7-layers
or something else ?

Do you also confirm that it was only for ISS that NASA used a 14-layer suit
to made the EMU.
Some speak of a 15 layer suit ? Was the original EMU made of 14 layers, and
the lastest one, a bit lighter named ISS EMU made of 15 layers ?

Thanks for your light

Thierry




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  #2  
Old July 8th 06, 01:50 PM posted to sci.space.history
[email protected]
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Posts: 1,516
Default number of layers in Apollo, ISS spacesuit ?

i think 21 for apollo landing suits.

there was a story a few years ago about them literally falling apart
from the incompatiple layers debonding or something.

each had a important job but ere never designed to co exist 30 plus
years. they were trying to figure out how to stop the detoriation

  #3  
Old July 9th 06, 03:38 AM posted to sci.space.history
[email protected]
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Posts: 8
Default number of layers in Apollo, ISS spacesuit ?


Thierry wrote:
Hi,

Could someone help be to find the correct version ?

I read at http://en.wikipedia.org/wiki/Extrave..._Mobility_Unit
that the apollo EVA suit was made of 21 layers. It is the first time I read
this.
Most websites tell that the A7L suit used for EVA during the moon missions
had only 7 layers
Question : what suit used Apollo crew during EVA ? An A7L made of 7-layers
or something else ?


From "U.S. Space Gear, Outfitting the Astronaut" by Lillian D.

Kozloski, the lunar extravehicular suit A7LB used on Apollo 14, 15, 16
and 17 included:

Layers:
1 - Teflon cloth
2 - Beta cloth
3,5,7 - Beta marquisette
4,6 - Aluminized gridded Kapton
8,10,12,14,16 - Aluminized Mylar performated film
9,11,13,15,17 - Nonwoven Dacron
18 - Neoprene-coated Nylon
19 - Nylon fabric
20 - Neoprene-coated Nylon
21 - Lycra jersey
22 - Lightweight Nomex cloth

In addition, the Liquid Cooling Garment is listed as:

23 - Nylon spandex (Hold vinyl tubing)
24 - Vinyl tubing (Water cooling distribution
25 - Porous nylon (Comfort layer)


Do you also confirm that it was only for ISS that NASA used a 14-layer suit
to made the EMU.
Some speak of a 15 layer suit ? Was the original EMU made of 14 layers, and
the lastest one, a bit lighter named ISS EMU made of 15 layers ?


The same reference shows a shuttle EMU consisting of:

For the thermal micrometeoroid garment:
1 - Ortho-fabric (Gore-Tex fibers woven with Nomex, backed with Kevlar)
2-6, Aluminized Mylar backed with unwoven Dacron
7 - Neoprene-coated nylon ripstop

and the PGA consisting of:
8 - Dacron woven with axial lines
9 - Polyurethane-coated Nylon

and a liquid cooling garment of
10 - Nylon acetate spandex woven with tubing
11 - Nylon acetate

Note that some of these are listed as separate layers in the A7LB suit,
but combined in the EMU suit. This doesn't answer all your question,
but is at least a starting point.

Thanks for your light

Thierry


  #4  
Old July 9th 06, 03:50 PM posted to sci.space.history
mike flugennock
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Posts: 285
Default number of layers in Apollo, ISS spacesuit ?

Thierry wrote:
Hi,

Could someone help be to find the correct version ?

I read at http://en.wikipedia.org/wiki/Extrave..._Mobility_Unit
that the apollo EVA suit was made of 21 layers. It is the first time I read
this.
Most websites tell that the A7L suit used for EVA during the moon missions
had only 7 layers
Question : what suit used Apollo crew during EVA ? An A7L made of 7-layers
or something else ?

Do you also confirm that it was only for ISS that NASA used a 14-layer suit
to made the EMU.
Some speak of a 15 layer suit ? Was the original EMU made of 14 layers, and
the lastest one, a bit lighter named ISS EMU made of 15 layers ?

Thanks for your light

Thierry


First of all, man, stay the hell away from Wikipedia, unless you're
looking for info on pressure suits used by Star Trek characters, or
information on pressure suit technology in Klingonese. Large numbers of
junior-high and high-school kids (at least in the USA) are being
summarily flunked for citing Wikipedia on their research papers due to
its editing methods and perverse refusal to publish articles written by
actual experts in their subjects.

That said, peep:http://www.astronautix.com/craft/a7l.htm
There were several mods to the A7L for intra- and extra-vehicular use;
there was the standard one that you always see them in in all those old
pictures, there were at least two mods for use in lunar EVA involving
micrometeoroid-protective coverings, cleated overshoes and helmet
sheild/visor assemblies, and there were mods further down the line for
use in SkyLab's different EVA requirements.

'Fraid I don't recall much about the Shuttle/ISS EVA suits other than
their being far more advanced despite their outward resemblance to the
old Apollo EVA gear.





Wishing they'd been able to put a camera on Armstrong's helmet,

--

..

"Though I could not caution all, I yet may warn a few:
Don't lend your hand to raise no flag atop no ship of fools!"

--grateful dead.
__________________________________________________ _____________
Mike Flugennock, flugennock at sinkers dot org
"Mikey'zine": dubya dubya dubya dot sinkers dot org
 




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