Thank you Eric.

I didn't say I felt fine, I said I can't tell the difference.
Above about 20,000 ft or so, I can tell the difference. I start to get a
headache and my ears tingle.
In addition, even at lower altitudes, if I divert blood from my brain, (how
does he do that, you ask?) by eating
a sandwich or the like, I have to get on O2 immediately. I can really tell
the difference.

No Bill, I am not a Sherpa and I can't quarrel with the acclimatization
point. I can only tell you what I experience.
There is no such thing as too much education and/or knowledge, so I can't
disagree with you there.

I haven't gone over 26,000 ft so my descriptions are only valid - for me -
up to that altitude.

I'm not really disagreeing with what you say, only with the thought that
regulations are required to make
it work. All the regulations in the world have not stopped stall-spin
accidents. How about we work on
that one?

Allan

"Eric Greenwell" wrote in message
...
Bill Daniels wrote:


At 16,000 ft., I can't tell the difference with or without O2.


Unfortunately, feeling fine can be one of the first symptoms of hypoxia.
How you FEEL means little. The only quantitative measure of hypoxia is
a
pulse oxymeter. Borrow one the next time you fly. The numbers will
likely
surprise you.

Since he feels (or at least "can't tell the difference") the same with and
without oxygen, are you suggesting he was hypoxic without the oxygen but
just couldn't tell that he was functioning differently than with the
oxygen?

...Snip....