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Re: [Land-speed] Fw: question

To: Glen Barrett <speedtimer@beyondbb.com>
Subject: Re: [Land-speed] Fw: question
From: DougOdom <dlodom@charter.net>
Date: Tue, 28 Aug 2007 11:37:48 -0700
Thanks Glen, I have one timing slip with SP and three with ST. I didn't 
want to muddy up the question about that till I got the answer about ST.

Doug Odom in big ditch

Glen Barrett wrote:

>Heres the answer to the ST that should be SP from the guy that programmed the
>system.
>Glen
>----- Original Message -----
>From: Rice, James
>To: Glen Barrett
>Sent: Tuesday, August 28, 2007 11:58 AM
>Subject: RE: question
>
>
>That was a miss-abbreviation that should have been SP, (it was corrected on
>some timing slips, towards the end of the week).  SP stands for Station
>Pressure, which means un-corrected barometric pressure.  Barometers measure
>air pressure, but since air pressure also varies by altitude, they are
>corrected to read equivalent sea level values.   Station Pressure is the
>actual, un-corrected value the instrument read.  Station Pressure is needed to
>calculate the density altitude that is also printed on the timing slip.
>
>James Rice
>ChronoLogic Timing
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