When I Started flying Hang Gliders here in Telluride and Central Colorado
 and the Owens Valley I made dozens and dozens of trips up into the low 20's
 without O2. I also look back and found  my self in the landing zone not
 remembering much on how I got there!...
This is the sort of thread that can shed a whole lotta insight into such 
things as: info/knowledge diffusion/comprehension rates throughout targeted 
special-interest populations (hang-glider/sailplane types); hypoxic realities; 
etc.
All hypoxia-related stories are the same, but different!
I musta had sufficient imagination & curiosity to both seek out info on the 
topic and believe what I read, even before availing myself of the opportunity 
of a chamber ride back in the '80s. (For the record, I - then, anyway - was 
one of those people who essentially lacked "any obvious symptoms" [arguably, 
the most at-risk kind?] other than "the usual mental degradations"...no blue 
fingernails, no giddiness, no "B&W vision symptoms"...just mental 
dullness/sloppy-handwriting/etc/) By then I owned a ship w. an O2 system...and 
after then, I *believed* (!!!).
Ever-after, part of me was amazed/appalled whenever encountering someone 
ignorant-of/unbelieving of altitude-related hypoxia (think: any Himalayan 
mountain climbing tale). Flying from Boulder, CO (at the eastern base of the 
Rockies), it wasn't uncommon for "a hang glider type" to either stop by the 
field for a chit-chat, or occasionally land there from a cross-Divide flight.
One in particular sticks with me. After relating my amazement to having 
encountered a hang glider near 18,000' on one bitterly cold March day above 
the Williams Fork Range and asking him how he dealt with such wind chill, he 
related a flight to that altitude that all he remembered anything about was 
the takeoff and subsequent post-landing landing somewhere he knew not where, 
miles from his launch site..."coming to" long after he'd landed. He put it 
down to "the cold"; I noted he might want to do some research about hypoxia!
Cowabunga!!!
Bob W.
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