Re : Delta Ratio

From:         GWilson404@aol.com
Date:         13 Sep 96 03:03:39 
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In article <airliners.1996.1757@ohare.Chicago.COM>, "John D. Lundell"
<lundell@winternet.com> writes:

>I ran accross the term "Delta Ratio".  I believe it has something to do
>with takeoff performance over obstacles.  Can anyone give me a detailed
>message of what "Delta Raio" means?


Delta is sometimes used to mean the ratio of either ambient or engine face
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. I know of no other use of the term
"delta".

Hope this helps.

Gerald Wilson