wrote in message ...
I've been at 23000 feet hanging on to a bar out side of the airplane
with 300 of my best friends without oxygen. We used supplemental o2
(mostly cannulas) on the climb to alt but when it was time to climb out
of the aircraft we were without o2 during the 30-45 seconds waiting to
exit.
We didn't carry o2 on us, but were in more dense air in short order.
We learned to conserve our energy so we didn't burn the o2 we had stored
in our bodies.

IN which case you have ONE and only ONE decision to make during that lfight
:~)


There have been climbers that have reached the top of everest without o2.
keeping calm is the secret to most high altitude operations.

And acclimation.

Oxygen for flights over 5000 feet at night? I live at 5800 feet and the
cannula gets in the way when having sex.





Matt Barrow wrote:
"john smith" wrote in message
...

Time of useful consciousness at FL250 is 10-15 seconds without
supplemental O2.


He's talking about using cannulas versus a full face mask.


wrote:
[snip]

But these systems are not designed to deliver anything close to pure O2

to

the user. The maximum O2 concentration they CAN deliver will provide
sufficient O2 PP at about 18000 ft for cannulas and about 26000 ft (if
I
recall correctly) for masks.

[snip]