Will From Australia, joined May 1999, 79 posts, RR: 0 Posted (15 years 9 months 1 week 3 days 13 hours ago) and read 875 times:
l can believe that Rolls Royce and Pratt & Whitney continue to persist with E.P.R as the their main thrust indication for their jet engines. l personally like a N1 indication only like on the CF6 series and the CFM 56 series, with E.G.T and Fuel Flow close behind. ln an airliner, what would rather trust as your main power indication, E.P.R or just plain old N1...????
Zmey Gorynich From , joined Dec 1969, posts, RR:
Reply 3, posted (15 years 9 months 1 week 3 days 9 hours ago) and read 876 times:
N1 will not give you anything, but N1 Revolutions per Minute..
EPR will give you the amount of air, passing trough the engine, thus showing you, how powerful the flow of air is.
let me bring in an example- you start your car on the ice-
you push your accelerator pedal, but.. you stand on the same place!
you look at the tachometer and you see, that your engine works, but you do not have any speed. so in that case Tachometer will be your N1 and speedometer will be your EPR. and, in order to read information correctly, I'd read speedometer...
and in every manual you will see, that the thrust of a jet engine should be measured with the help of EPR gauge, not N1.
Jetpilot From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 8, posted (15 years 9 months 1 week 3 days 1 hour ago) and read 878 times:
I personally set my takeoff and climb power settings to my EPR for each engine. In cruise I set my power to the EPR and then once everything is stabilized I match all my N1's to the highest one. I personally like N1 power settings myself. It's a direct reading off of the gearbox. If I match the EPR's up in cruise flight then everything else will be off like fuel flow, and EGT's. When N1's match N2's also match. That's a pretty good indication of accuracy. EPR's do tell you one thing that no other guage will tell you however, and that's the condition of the airflow you are getting into the engine. They will tell you when you're accumulating ice in the inlet. Good question.
G5 From United States of America, joined Oct 2006, 21 posts, RR: 0
Reply 11, posted (15 years 9 months 1 week 3 days ago) and read 875 times:
Hi.....Will is operating from 2 servers and even though he sends from one of them, the replies have to be addressed to the other.....very confusing! :-)
Anyway, his address for sending to is firstname.lastname@example.org