N1 and N2
Before you begin with airplane type specifics, you really ought to come to grips with the underlying theory.
Looking at the level of your questions, Wikipedia might help you get a general understanding of these systems. As soon as you have read up on this and have further questions, by all means do come back here.
https://en.wikipedia.org/wiki/Airbreathing_jet_engine
https://en.wikipedia.org/wiki/Pack_(aircraft)
Looking at the level of your questions, Wikipedia might help you get a general understanding of these systems. As soon as you have read up on this and have further questions, by all means do come back here.
https://en.wikipedia.org/wiki/Airbreathing_jet_engine
https://en.wikipedia.org/wiki/Pack_(aircraft)
Last edited by Tu.114; 27th Oct 2017 at 13:52. Reason: Getting the link to work
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your atpl material database really should have this, it is not difficult to understand at all
basically the system that cools the bleed air taken from the engine intakes and then released to the cabin at a reasonable temeprature
basically the system that cools the bleed air taken from the engine intakes and then released to the cabin at a reasonable temeprature
N1 relates to the fan. N2 to the turbine.
N1 is the rotational speed (usually expressed in percentage terms) of the low-pressure shaft connecting the low-pressure compressor (or fan) to the low-pressure turbine.
N2 is the similar measurement for the high-pressure shaft connecting the high-pressure compressor to the high-pressure turbine.
In the case of a three-spool engine, the N2 relates to the intermediate-pressure shaft and there will be a further reading, N3, which relates to the high-pressure shaft.
So you see that there are 'turbines' driving both (or all three) shafts. The Cessna description could imply that the 'fan' and its 'turbine' rotate at two different speeds, which is obviously not the case. (There is of course the exception of a geared fan!)
P.S. First time I've seen the definition of PACK. Thanks; makes sense!
Last edited by eckhard; 27th Oct 2017 at 15:34.