At the higher altitude air density will be less, meaning you will get a linear
decrease in the power required to overcome air drag. How much decrease will
depend on ambient conditions at the time of the test. However, if the altitude
is about 5000ft, then standard air density (not adjusted for ambient
conditions) would be about 15% less than at sea level.
Of course, the power their motor produces will be affected by altitude as well.
-Andy
--- Keith Hearn <khearn@Legato.COM> wrote:
> In message <20000126053231.18083.qmail@web107.yahoomail.com>, Andy McKee
> writes
> :
> > OK, you made me run numbers...
> >
> > At sea level (for standard air density) they would need the following hp,
> > neglecting all other losses except what is required to overcome air drag...
> >
> > Miata with top down.....424.8hp
> > Miata with hard top.....347.6hp
> > C5......................344.4hp
> >
> > Considering drivetrain losses, rolling resistance (all contributors), etc.
> > they'd need probably anywhere from 10% to 40% (WAG) than that.
>
> How does all that change at high altitude, such as at Bonneville, where
> they intend to do their speed runs?
>
> Keith Hearn
> '99 Miata 10AE "Sexy Sadie" the Sapphire Shark
> Milpitas, CA
>
>
>
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