Re: Delta Ratio

From: (MikeM727)
Organization: America Online, Inc. (1-800-827-6364)
Date:         17 Sep 96 02:24:42 
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In article <airliners.1996.1875@ohare.Chicago.COM>,

>Delta is sometimes used to mean the ratio of either ambient or engine
>total pressure to sea level static standard pressure, 1013.25mb or
>14.69psia. At constant temperature the thrust of a jet engine is directly
>proportional to this value , which therefore has to be taken into account
>in field performance calculations.

This sounds to me more like a description of EPR, Engine Pressure Ratio.
I've never heard EPR referred to as "Delta".  Of course the term "delta"
can be used to mean  any differential.