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