Anyone that would like a print out of a density altitude chart from a
helicopter flight manual, let me know off line and I'll fax you one.
Dale C.
>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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