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DC-10 N1 Vs EPR

UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11
Posted (9 years 2 months 1 week 5 days 20 hours ago) and read 2354 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

NightFlyer From United States of America, joined Sep 2001, 95 posts, RR: 3
Reply 1, posted (9 years 2 months 1 week 5 days 19 hours ago) and read 2308 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

UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11
Reply 2, posted (9 years 2 months 1 week 5 days 19 hours ago) and read 2299 times:

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

MD11Engineer From Germany, joined Oct 2003, 13332 posts, RR: 64
Reply 3, posted (9 years 2 months 1 week 5 days 17 hours ago) and read 2222 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

AJ From Australia, joined Nov 1999, 2376 posts, RR: 27
Reply 4, posted (9 years 2 months 1 week 5 days 17 hours ago) and read 2209 times:

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

B747Skipper From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 2 months 1 week 5 days 15 hours ago) and read 2188 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

MD-11 forever From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 2 months 1 week 5 days 15 hours ago) and read 2180 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]

Musang From United Kingdom, joined Apr 2001, 754 posts, RR: 7
Reply 7, posted (9 years 2 months 1 week 5 days 2 hours ago) and read 2122 times:

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

Regards - Musang

3204ever From Denmark, joined Mar 2004, 21 posts, RR: 0
Reply 8, posted (9 years 2 months 1 week 5 days 2 hours ago) and read 2124 times:

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

NightFlyer From United States of America, joined Sep 2001, 95 posts, RR: 3
Reply 9, posted (9 years 2 months 1 week 4 days 23 hours ago) and read 2096 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

UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11
Reply 10, posted (9 years 2 months 1 week 1 day ago) and read 2023 times:

Thanks much for the answers!

DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3
Reply 11, posted (9 years 2 months 1 week 10 hours ago) and read 1995 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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