We were flying 15.5 to 17.5 a lot and I got hypoxic three times before I figured it out.
First: Our original set up was the mustache with a floating ball flow meter. Thinking the ball set to float at or slightly above indicated altitude would get it. Not for me, but my wife was fine. Second try: Upgraded to Mountain High two place electronic Portable Pulse Demand. This is the gold standard for automatic altitude adjustment and Oxygen conservation, more comfortable too with the small cannula. Third refinement: I was still getting headaches and feeling tired after some flights. Then I discovered the pulse oximeter that measures blood oxygen level. Now I adjust the flow for 92% and everything is all better. I feel fresher than a one hour flight at 8500' after three plus hours at 17,500' while enjoying cool cockpit temp, usually smooth air, next to no traffic, occasional strong tailwinds and 10 to 11 GPH fuel burns. Additional refinement: I have done several flights with a mask above 10,500'. Looks like that will be even more effective than a cannula for me.
Steve Colwell Legacy 550
Sent from my iPad
Tom,
Ok, you asked for regulation. It would seem that's it. I won't search for
it now, but because I am well acquainted with creeping hypoxia, there is
information that relates to density altitude (just like the engine), age,
physical condition, etc. and the effect on O2 absorption, and where gas pressure
differentials start to resist the transfer of O2. Thus, in certain environments
a mask is required to force the O2 pressure high enough to cause the transfer to
occur in the lungs.
The FAA requirements are minimal. When the O2 saturation levels drop to
around 89%, an individual is impaired. Night vision is dramatically affected by
even minimal reduction in blood O2 saturation.
BTW, recognition of impairment may be hindered by euphoria.
Scott
PS My 700 MSL home location gives my old fat body O2 results that vary from
95% to 97%. Young healthy folks should be showing 99%-100%.
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