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DC-10 N1 Vs EPR  
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Posted (10 years 4 months 3 weeks 6 days 4 hours ago) and read 2871 times:

Is it true that DC-10 crews use N1 to set thrust rather than EPR? I remember hearing that somewhere along the way at UA. Can anyone confirm this?

11 replies: All unread, jump to last
 
User currently offlineNightFlyer From United States of America, joined Sep 2001, 95 posts, RR: 3
Reply 1, posted (10 years 4 months 3 weeks 6 days 3 hours ago) and read 2825 times:

We don't have EPR on the -10's and -30's, just N1. I'm not familiar with the -40's but they might have EPR's since that have the Pratts.


NightFlyer


User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Reply 2, posted (10 years 4 months 3 weeks 6 days 3 hours ago) and read 2816 times:

Isn't EPR a more direct measurement of thrust than N1? How do they take that into account?

User currently offlineMD11Engineer From Germany, joined Oct 2003, 13968 posts, RR: 63
Reply 3, posted (10 years 4 months 3 weeks 6 days 1 hour ago) and read 2739 times:

On high bypass engines 90% of the thrust come from the fan, which is directly proportional to N1 speed, so EPR is not really needed. I don´t know why P&W still insist on using EPR.

Jan


User currently offlineAJ From Australia, joined Nov 1999, 2386 posts, RR: 24
Reply 4, posted (10 years 4 months 3 weeks 6 days 1 hour ago) and read 2726 times:

DC-10-10/-30 would have N1, DC-10-40 would have EPR!

User currently offlineB747Skipper From , joined Dec 1969, posts, RR:
Reply 5, posted (10 years 4 months 3 weeks 5 days 23 hours ago) and read 2705 times:

P&W engines (JT9) use EPR as primary power setting means.
GE engines (CF6) use N1, no EPR available on these engines>
xxx
Happy contrails  Smile
(s) Skipper


User currently offlineMD-11 forever From , joined Dec 1969, posts, RR:
Reply 6, posted (10 years 4 months 3 weeks 5 days 23 hours ago) and read 2697 times:

True, GE(and CFM 56) engines are controlled by N1 speed, while Pratt and RR are controlled by EPR.

Cheers, Thomas

[Edited 2004-03-09 07:59:43]

User currently offlineMusang From United Kingdom, joined Apr 2001, 862 posts, RR: 7
Reply 7, posted (10 years 4 months 3 weeks 5 days 10 hours ago) and read 2639 times:

737 3/4/500s, and Avro RJ 100/146s have no EPR gages and use N1.

Regards - Musang


User currently offline3204ever From Denmark, joined Mar 2004, 21 posts, RR: 0
Reply 8, posted (10 years 4 months 3 weeks 5 days 10 hours ago) and read 2641 times:



Airbus 320 series with IAE V2500,use EPR as primary power setting.


User currently offlineNightFlyer From United States of America, joined Sep 2001, 95 posts, RR: 3
Reply 9, posted (10 years 4 months 3 weeks 5 days 7 hours ago) and read 2613 times:

We have MD11's with GE's that use N1's and our PW's use EPR. All of our MD10's use N1.


NightFlyer


User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Reply 10, posted (10 years 4 months 3 weeks 1 day 8 hours ago) and read 2540 times:

Thanks much for the answers!

User currently offlineDC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 2
Reply 11, posted (10 years 4 months 3 weeks 18 hours ago) and read 2512 times:

Some DC-10's were delivered with EPR. I don't know how long the GE powered 10's used EPR, but they don't any more.

As a general rule, GE uses N1, P&W uses EPR, regardless of aircraft type.



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