O2 Concentrator instead of O2 tank

On Tue, 05 Dec 2006 23:52:06 +0000, in
, Chris wrote:
Personally its no booze for me 24 hours before flying.

Damn, if that was the case, I would *never* get a chance to fly...
Personally, I have no problem with flying after having a full night's
sleep after having been drinking... But then again, I'm not trying to fly
first thing in the morning either... Hell, it takes a couple of hours just
to get my caffeine level up enough to just make the *drive* to the
airport... grin

Upto 10,000 ft air only
10,000 - 33,700 ft Oxygen/air mix
33,700 - 40,000 ft 100% oxygen
40,000 + 100% Oxygen under pressure



I flew fighters for the Air Force (F-4E) and I recal going to pressure
breathing at about 25,000 feet cabin altitude. This was an emergency
only
because the cabin pressure never got this high. I also recall a rule to
not go over 50,000 feet because of blood boiling (bends) IF the cabin
pressure was lost at greater than 50,000 feet.

Well the bends more commonly known as Decompression Sickness (DCS) is a
possibility from about 18,000 ft unpressurised and is caused by the
nitrogen
in the blood coming out.

-----remainder snipped for brevity----------

I recall reading that the Blackbird crews (SR71 and U2) breathed pure oxygen
for several hours prior to each mission in order to clear their bodies of
dissolved nitrogen. I presume that the above was the reason.

Peter

Jose wrote:
Thou tilts at windmills! My idiomatic use stands in good company...

Ok, let's examine them.

[ Elided very amusing response for brevity. ]

Whence. From where.

Take that, windmill!

Ahem... Alonso Quixano eventually repented his madness on his deathbed. ;-)

Ahem... Alonso Quixano eventually repented his madness on his deathbed. ;-)

.... and I thought you'd point out my one error. Oh well, this is
usenet. Make a mistake and nobody notices!

Besides, when he repented, he certainly didn't say "from whence my
madness cometh".

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

Jose wrote:
Ahem... Alonso Quixano eventually repented his madness on his
deathbed. ;-)

... and I thought you'd point out my one error. Oh well, this is
usenet. Make a mistake and nobody notices!

Neglecting spelling and typos, and now that you've alerted me to an error,
the only two I've so far found a

1) You said "There's not a "from" in the whole passage," yet one sticks out
like a sore "from whence":

"...cometh from the..."

2) Insulting Samuel Langhorne Clemens, one of my favorite authors. (I grew
up reading Robert Heinlein, among other SF authors, and later in life read
several of Clemens' works. Those Missouri boys sure knew how to write some
tall tales! Heinlein once wrote that he hadn't invented any new stories,
just filed off the serial numbers of some old ones and repackaged them.
After I read enough Twain, I realized from whence some of Heinlein's plots
came. ;-) )

Besides, when he repented, he certainly didn't say "from whence my
madness cometh".

Out of curiosity I did a text search of Project Gutenberg's online copy of
John Ormsby's famous translation of Don Quixote[1] and while Ormsby used
whence 29 times, he slipped up once and wrote "from whence" one of those
times.

[1] http://www.gutenberg.org/etext/996

1) You said "There's not a "from" in the whole passage,

Yep. That was it. I posted before checking. I repent. You can use
"from" and "whence" together, as long as you put a whole lot of words
between them.

2) Insulting Samuel Langhorne Clemens

Well, that's not an error, I think he would have approved. I like his
writing too; he really made things real. Heinlein's ok. I was about to
say unreadable, but I mistook him for Bradbury, who =is= unreadable.
Six times I tried to read "I sing the body electric" because the title
was so intriguing... six times I couldn't get past page thirty.

Back on topic, perhaps a body electric would be able to power an O2
concentrator, allowing unpressurized flight on Mars.

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

Jose wrote:
Well, that's not an error, I think he would have approved. I like his
writing too; he really made things real. Heinlein's ok. I was about to
say unreadable, but I mistook him for Bradbury, who =is= unreadable.
Six times I tried to read "I sing the body electric" because the title
was so intriguing... six times I couldn't get past page thirty.

Bradbury's work is a mixed bag. I enjoyed The Martian Chronicles.

Back on topic, perhaps a body electric would be able to power an O2
concentrator, allowing unpressurized flight on Mars.

That would take a lot of body electricity! It would make more sense to
crack the CO2 in the Martian atmosphere into C and O2 than concentrate the
free O2:

http://en.wikipedia.org/wiki/Atmosphere_of_Mars

That would take a lot of body electricity! It would make more sense to
crack the CO2...

Yeah, I guess if you are on Mars, you do need to deal with Mars'
atmosphere, and not Earth's.

Bloody facts!

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

"Peter Dohm" wrote in message
...


Upto 10,000 ft air only
10,000 - 33,700 ft Oxygen/air mix
33,700 - 40,000 ft 100% oxygen
40,000 + 100% Oxygen under pressure



I flew fighters for the Air Force (F-4E) and I recal going to pressure
breathing at about 25,000 feet cabin altitude. This was an emergency
only
because the cabin pressure never got this high. I also recall a rule
to
not go over 50,000 feet because of blood boiling (bends) IF the cabin
pressure was lost at greater than 50,000 feet.

Well the bends more commonly known as Decompression Sickness (DCS) is a
possibility from about 18,000 ft unpressurised and is caused by the
nitrogen
in the blood coming out.

-----remainder snipped for brevity----------

I recall reading that the Blackbird crews (SR71 and U2) breathed pure
oxygen
for several hours prior to each mission in order to clear their bodies of
dissolved nitrogen. I presume that the above was the reason.

Peter

Yep, goes back to Henry's Law , the gas dissolved in a liquid is
proportional to its pressure and brings us nicely back to the topic of
this thread.

Chris wrote:


The received wisdom is that if you have been scuba diving and gone deeper
than 30 ft (ie breath under pressure) then flying should be avoided for 24
hours.

That's not a reasonable rule. The generally accepted rules run 18-24
hours, but they all START a with a single dive. Nitrogen absorption
is not just a matter of depth but also time. Even at 10 feet if you
dived for a for over an hour you'd be in trouble.



I suspect that those pilots who have been busted recently either don't know
or don't care to know how alcohol works in the body.

Busted, I don't know..but found to have alcohol after a crash, yes.
The first story in the "I Called It Pilot Error" book deals with
precisely this subjec.t