Thanks for the relpy. I may may have thrown a curve ball with my explanation, (or should I say my incorrect labelling) of the various P sources. What I am trying to find out is if his explanation of EPR<1.0, or mine, or both, are/is correct.
As a complete aside, I am not aware of a P1.3 coming into play on the Trent, but as you are aware they are pretty much the same thing design wise. Will have to ask a Gingerbeer next time I get the chance.
And yes, if asked, what measures compressor inlet pressure?, I do say... that probe thing that hangs down at the top of the inlet. As you can see I always get my P`s screwed up.
[This message has been edited by jtr (edited 20 September 2000).]