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9th Sep 2019, 11:05

#5 (permalink)

Pilot DAR

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Join Date: Aug 2006

Location: Ontario, Canada

Age: 63

Posts: 5,627

Likes: 2

Received 64 Likes on 45 Posts

I have one. I don't fly high much any more, but they certainly work. During my experimentation as a observer following some higher altitude flight testing, I was able to purposefully get my O2 down to 88%, and felt miserable.

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