>Date: Wed, 23 Apr 2003 10:59:04 +1200
>From: Chris Harris <yesford@clear.net.nz>
>Subject: Re: Early vs Late Runs...
>
>Thanks for the anology Mayf,
>A basic qustion from me while on the subject:
>With all conditions being equal ie temperature and humidity.
>How much less oxygen, percentage wise is available at 5,000 ft compared to sea
>level.
I did these calcs about a year and a half ago out of sheer boredom, and I'm
trying to remember what I came up with. I think it was approximately 66%
of the oxygen at Denver altitude (I either used 5280, or 6000 feet in my
calc) as opposed to sea level. It's important to note that most of the
atmosphere lives around the 0-3000ft level, so that's where the loss is
seen the greatest as you go up. Going from Denver down to 4500-5000ft
you're probably only going up by 10% of density or so, at the most. I did
use standard atmospheric conditions in my calculations; expect it to be
even worse at 95 degrees temp (esp. with high humidity). However that's a
linear calculation, so it would be easier to figure out; the altitude loss
takes some time if you don't have the calculation in a spreadsheet or
something.
- Ralph
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