High altitude flight (relatively speaking)

[ilovecornfields]

“In 1967, Kaczynski's dissertation, Boundary Functions,^[35] won the Sumner B. Myers Prize for Michigan's best mathematics dissertation of the year.^[8] Allen Shields, his doctoral advisor, called it "the best I have ever directed",^[19] and Maxwell Reade, a member of his dissertation committee, said, "I would guess that maybe 10 or 12 men in the country understood or appreciated it."^[8][30]

In late 1967, the 25-year-old Kaczynski became an acting assistant professor at the University of California, Berkeley, where he taught mathematics.”

https://en.m.wikipedia.org/wiki/Ted_Kaczynski
 

Does this win the thread drift prize?

[Ragsf15e]

Sooo, from the Unibomber back to oxygen…

I’m 50yo (ugh), good shape (7 mile race in may), never smoked, live at 2000’, etc.  However, my pulse ox dips to the mid 80s pretty easily flying around 9-11000 out west and I feel like crap after long flights at those altitudes.

I have a D size O2 bottle and it works, however it’s bulky and tough to get filled easily.  I bought an inogen g5 concentrator and tried it out crossing the cascades this weekend.  11,5000’ on the way home next to Mt Rainier, 96 pulse ox.  Feel much better this afternoon too.  Battery lasts several hours, but I can’t recharge (or run off dc power) in the airplane because it draws 10amps through the cigarette lighter adapter while I only have a 3amp breaker.

I think I’d prefer an installed aircraft O2 bottle (and a good way to fill it), but this seems to work ok for those of us without that setup.  Only bad thing today was some Cirrus driver asking center if he was going to have to get vectors around me since he had a 20kt overtake and we were going the same way.

[Will.iam]

I have done some experiments with my oxymeter that i find interesting and easy way to test it working correctly. In my house sitting in a chair if i hold my breath especially after a deep breath and watch the oxymeter after about 3 seconds i see my O2 if it was lower than 98 or 97 go up to 99. After about 30 seconds of holding my breath, the %O2 starts to drop at 1 min im in the 80’s at 1.5 mins I’m going into the upper 70’s but when i take a breath it still drops a few points more until it shoots back up to the high 90’s.  It takes about 2-3 heartbeats to pump that fresh oxygenated blood to my finger where the oxymeter can register it. One of the first early symptoms i get when flying is an elevated heartbeat when my %O2 starts to get below 90%. Also sitting upright instead of sloughing with normal breathing gets me 3 point increase. If i do full breaths while sitting upright another 3 points. So with just good posture and big deliberate breaths i can get back 6 points. 
if i on top of a full breath gulp down a few more mothfuls of air and pressurize my lung capacity a little i can get up to 4 more points but that gets exhausting quickly.