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Skin tight space suits ?



 
 
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  #1  
Old July 26th 17, 05:39 PM posted to sci.space.policy
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Posts: 75
Default Skin tight space suits ?

On Monday, July 17, 2017 at 7:56:07 PM UTC-4, Fred J. McCall wrote:
JF Mezei wrote:

On 2017-07-16 19:29, Fred J. McCall wrote:

Don't worry about the whole 'blood boiling' thing. That takes a
while, even in pure vacuum. Worry about dissolved blood gasses coming
out of solution.


ok, so the "bends" is the bigger problem then. and i guess a "no
pressure" suit would require much longer camping in airlock than 5psi suit.


A "no pressure suit" means you die.


especially true if you breathe in at 5psi and blood flows to no pressure
areas of body.


Where did you get this 'no pressure' idea?


but if low/no pressure has instant effects on the blood releasing
disolved gases, wouldn't the same happen to its boiling point?


Do divers have problems with blood boiling?


if the skin bloats in lower pressure, couldn't they make a suit that is
easier to get in and let body bloat create the pressure?


Because you can't reliably create consistent pressure everywhere that
way AND you'd like to not injure people.


also, have they solved the issue of anus and urethra? wouldn't lower
external pressure result in far more difficult time for muscles to
contain what's in body? assuming perfectly moulded suit, would
mechanical fabric pressure on anus do the trick or does this really
require gaseious pressure to reach the muscles so there is equilibrium?


You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.



I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.
  #2  
Old July 27th 17, 02:06 AM posted to sci.space.policy
Fred J. McCall[_3_]
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Posts: 10,018
Default Skin tight space suits ?

wrote:

On Monday, July 17, 2017 at 7:56:07 PM UTC-4, Fred J. McCall wrote:
JF Mezei wrote:

On 2017-07-16 19:29, Fred J. McCall wrote:

Don't worry about the whole 'blood boiling' thing. That takes a
while, even in pure vacuum. Worry about dissolved blood gasses coming
out of solution.


ok, so the "bends" is the bigger problem then. and i guess a "no
pressure" suit would require much longer camping in airlock than 5psi suit.


A "no pressure suit" means you die.


especially true if you breathe in at 5psi and blood flows to no pressure
areas of body.


Where did you get this 'no pressure' idea?


but if low/no pressure has instant effects on the blood releasing
disolved gases, wouldn't the same happen to its boiling point?


Do divers have problems with blood boiling?


if the skin bloats in lower pressure, couldn't they make a suit that is
easier to get in and let body bloat create the pressure?


Because you can't reliably create consistent pressure everywhere that
way AND you'd like to not injure people.


also, have they solved the issue of anus and urethra? wouldn't lower
external pressure result in far more difficult time for muscles to
contain what's in body? assuming perfectly moulded suit, would
mechanical fabric pressure on anus do the trick or does this really
require gaseious pressure to reach the muscles so there is equilibrium?


You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.


I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.


Obviously you misunderstood what was said, as usual, Dougie. There is
no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is
squirted in through a lock in the helmet. The original aircraft were
pressurized to around 30,000 feet altitude equivalent, which means if
you aren't in a sealed suit you die.


--
"Ignorance is preferable to error, and he is less remote from the
truth who believes nothing than he who believes what is wrong."
-- Thomas Jefferson
  #3  
Old July 27th 17, 12:16 PM posted to sci.space.policy
Jeff Findley[_6_]
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Posts: 2,307
Default Skin tight space suits ?

In article ,
says...
You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.


I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.


Obviously you misunderstood what was said, as usual, Dougie. There is
no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is
squirted in through a lock in the helmet. The original aircraft were
pressurized to around 30,000 feet altitude equivalent, which means if
you aren't in a sealed suit you die.


U-2 started out as unpressurized
http://www.lockheedmartin.com/us/new...U260Years.html

But later, cockpit pressure was increased to the equivalent of about 14k
feet, which is pretty thin.
http://aviationweek.com/blog/what-do...ane-pilots-eat

Still, the above article does confirm that flight at altitude is done
with a sealed helmet and that pilots must remain alert, so I don't see
how "sleeping" would ever be allowed. That plane is a bitch to fly.
It's very unforgiving at altitude.

Jeff
--
All opinions posted by me on Usenet News are mine, and mine alone.
These posts do not reflect the opinions of my family, friends,
employer, or any organization that I am a member of.
  #4  
Old July 27th 17, 01:11 PM posted to sci.space.policy
Fred J. McCall[_3_]
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Posts: 10,018
Default Skin tight space suits ?

Jeff Findley wrote:

In article ,
says...
You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.


I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.


Obviously you misunderstood what was said, as usual, Dougie. There is
no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is
squirted in through a lock in the helmet. The original aircraft were
pressurized to around 30,000 feet altitude equivalent, which means if
you aren't in a sealed suit you die.


U-2 started out as unpressurized
http://www.lockheedmartin.com/us/new...U260Years.html

But later, cockpit pressure was increased to the equivalent of about 14k
feet, which is pretty thin.
http://aviationweek.com/blog/what-do...ane-pilots-eat

Still, the above article does confirm that flight at altitude is done
with a sealed helmet and that pilots must remain alert, so I don't see
how "sleeping" would ever be allowed. That plane is a bitch to fly.
It's very unforgiving at altitude.


Actually the original aircraft pressurized to 50,000 feet. If they
were totally unpressurized the pilots would have been unable to
manipulate the controls at high altitude due to the pressure in the
suit. As you note, there was a later program to reinforce the
airframes so that they could hold more pressure. This was undertaken
because several pilots exhibited symptoms of the bends because of the
low cockpit and suit pressure. By increasing the pressure in the
cockpit they could increase the pressure in the suit and still have
the pilot able to fly.


--
"The reasonable man adapts himself to the world; the unreasonable
man persists in trying to adapt the world to himself. Therefore,
all progress depends on the unreasonable man."
--George Bernard Shaw
  #5  
Old July 27th 17, 01:26 PM posted to sci.space.policy
[email protected]
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Posts: 75
Default Skin tight space suits ?

On Thursday, July 27, 2017 at 7:17:03 AM UTC-4, Jeff Findley wrote:
In article ,
says...
You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.


I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.


Obviously you misunderstood what was said, as usual, Dougie. There is
no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is
squirted in through a lock in the helmet. The original aircraft were
pressurized to around 30,000 feet altitude equivalent, which means if
you aren't in a sealed suit you die.


U-2 started out as unpressurized
http://www.lockheedmartin.com/us/new...U260Years.html

But later, cockpit pressure was increased to the equivalent of about 14k
feet, which is pretty thin.
http://aviationweek.com/blog/what-do...ane-pilots-eat

Still, the above article does confirm that flight at altitude is done
with a sealed helmet and that pilots must remain alert, so I don't see
how "sleeping" would ever be allowed. That plane is a bitch to fly.
It's very unforgiving at altitude.


The pilot that did the talk flew out of Scotland in the mid 1990's.

I guess I misunderstood what opening a helmets face plate means. Your reference indicates a 14,000 foot cockpit pressure.

He did say clearly that an auto pilot was used. It made mapping mission type ground tracks. I remember the comment that altitude control was by monitoring engine temperature.

He also said that if you cannot land exactly balanced on the front dual wheels you need to look elsewhere for another assignment.
  #6  
Old July 27th 17, 09:49 PM posted to sci.space.policy
Fred J. McCall[_3_]
external usenet poster
 
Posts: 10,018
Default Skin tight space suits ?

wrote:

On Thursday, July 27, 2017 at 7:17:03 AM UTC-4, Jeff Findley wrote:
In article ,
says...
You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell
you this.


I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed.


Obviously you misunderstood what was said, as usual, Dougie. There is
no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is
squirted in through a lock in the helmet. The original aircraft were
pressurized to around 30,000 feet altitude equivalent, which means if
you aren't in a sealed suit you die.


U-2 started out as unpressurized
http://www.lockheedmartin.com/us/new...U260Years.html

But later, cockpit pressure was increased to the equivalent of about 14k
feet, which is pretty thin.
http://aviationweek.com/blog/what-do...ane-pilots-eat

Still, the above article does confirm that flight at altitude is done
with a sealed helmet and that pilots must remain alert, so I don't see
how "sleeping" would ever be allowed. That plane is a bitch to fly.
It's very unforgiving at altitude.


The pilot that did the talk flew out of Scotland in the mid 1990's.


Another thing you apparently misunderstood. No U-2 aircraft ever
operated out of Scotland.

http://www.ais.org/~schnars/aero/ol-det.htm


I guess I misunderstood what opening a helmets face plate means. Your reference indicates a 14,000 foot cockpit pressure.


I guess you did, since the faceplate is not intended to be opened by
the pilot.


--
"Ordinarily he is insane. But he has lucid moments when he is
only stupid."
-- Heinrich Heine
 




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