T o d d P a t t i s t writes:

To address this post, however, I've always noticed the
altitude at about 16-17,000'. If you pull off the
mask/cannula well above that, you will probably pass out
before you really have a chance to notice the limited oxy,

Did that. Well, close. My cannula slipped out while I was trying out
my new relief bag. (It wasn't quite big enough and I got distracted.)
I thought my wife was going to get to land for the better part of a
minute before I realized what had happened.

When I first got my certificate our O2 system didn't work (and the
turbos weren't so hot either). I flew all the time right at the legal
limits. No problems.

Then I got the O2 system (and turbos) fixed. Now I hate to fly without
a good supply of oxygen. It's *so* handy to be able to go high and stay
there without fatigue. I also like it at lower altitudes at night or
when I'm tired after flying all day.

I also have a pulse oximeter. I recommend both the oximeter and the O2
system.

--kyler