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16th December 2009 | 00:25

#10 (permalink)

galaxy flyer

Joined: Dec 2002

: ATP+Mil

Posts: 3,984

Likes: 568

From: Where the Quaboag River flows, USA

Years ago, a Pratt engineer told me a 1% error in N1 equals approximately 3%-4% error in thrust output, while a 1% error in EPR equals a 1% error in thrust. That is, EPR is a measure of thrust, but N1 is a measure of fan speed.

GF

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