Standard pressure and temperature
Lawrence C Leung
l.leung at juno.com
Wed Mar 21 19:12:48 EST 2001
I've skied at 12,000 ft (Taos, NM). Trust me you can breathe (just not
well). On any type of run, I could only go about 100 - 200 yards and then
HAD to stop, just to get oxygen. Too bad that they didn't sell it in
bottles there, 'cuz I would have bought up the venders stock just then.
Otherwise, totally awesome skiing!
LL (sea level) NY
On Wed, 21 Mar 2001 01:33:44 EST RubEric at aol.com writes:
>In a message dated 3/20/01 10:58:34 AM Pacific Standard Time,
>audi at mediaone.net writes:
><< > This can make a big difference - at 100 degrees F and 10,000
> > (altitude
> > > of Leadville, CO, for instance), the density altitude is now
> > to
> > > about 15,000 feet, and the outside air pressure is only 15
> > > mercury, which means we need THREE bar showing on the boost
>gauge to get
> > > sea level air pressure (1 bar) plus .5 bar boost (total 1.5 bar)
> > > manifold and thus sea level performance.
>No. You still need TWO bar on the boost guage to equal sea level
> If the maximum you can get at sea level is 2 bar, you will get
>proportionately less at altitude.
>The boost guage is absolute. At 18,000 feet the guage would read .5
>15 inches of mercury, or 500 millibars, or ~7psi). If your
>combination is CAPABLE of generating 15 lbs of boost (1 bar), your
>then would read 1.5 bar at max boost. To get 2 bar on the boost guage,
>would need a turbo/engine combination capable of generating 22.5 lbs
>(Note: A racing P-51 pulls about 120 inches of manifold pressure in
>trim. That is about FORTY FIVE lbs of boost!!!!! Normal maximum boost
>the P-51 in wartime trim was about 60 inches for take off.)
> <<<can you even *breathe* at 0.5 bar??? Just barely. In an
>aircraft, a pilot must breath supplemental oxygen above 10,000 feet
>passenger is nor required to breath supplemental oxygen until 12,000.
>do heavy work above 12,000 feet, however. It does require some
>to avoid "altitude sickness". The acclimation is to give the body
>generate additional red blood cells in order to extract the necessary
>from the lower pressure air with lower partial pressure of oxygen.
>Atmospheric pressure is half of sea level pressure at about 18,000
>There are other considerations of partial pressure of gases that are
>with being able to breathe not at issue with a turbocharged engine.
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