Re: Do airliner engens run at approximately constant speed, varying only torque?

From:         tristar500@aol.com (TriStar500)
Organization: America Online, Inc. (1-800-827-6364)
Date:         17 Jul 95 04:29:33 
References:   1
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> As far as I know, high bypass turbofans measure their thrust output
>through the N1 (rpm of the fan) gauge, as opposed to EPR (engine pressure
>ratio)...

Only General Electric uses N1 as the power setting parameter. PW and RR
both use EPR.

RR actually combines fan and core thrust in measuring EPR (they call it
Integrated EPR). PW only uses core thrust.