Re: 777 Engine RPM

Date:         16 Oct 97 00:44:11 
From: (Alan Andersen)
Organization: CyberGate, Inc.
References:   1 2
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On 01 Oct 97 19:57:50 , wrote:

>In article <airliners.1997.2222@ohare.Chicago.COM>, (Alan Andersen) writes:
>Very simply EPR is a function of actual rotor speed divided by the square
>root of the inlet total temperature. This would make the rotor speed some
>5%-10% lower at altitude to achieve the same EPR. On the other hand you need
>a higher EPR to achieve the same thrust due to reduced air density.

So, what do you calculate to be the max EPR at max N1 on a standard