PPRuNe Forums - EPR on Takeoff

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Hedncld

8th Jan 2006 05:54

EPR on Takeoff

Question for Old Smokey???
I was wondering what Epr does on Takeoff as far as the effects of ram air rise.
I fly MD80's and know that EPR decreases (.01 or so) on Takeoff but every book I read says epr should increase? Anyone have a thought on this???
Thanks
PS Dont go nuts with math equations-my brain is small.

stancioiu

8th Jan 2006 08:48

Re: EPR on Takeoff

The effect of ram rise begins at higher speeds. At takeoff, the speed builds up and since epr is the ratio between the pressure at exhaust and the pressure at inlet, is normally that epr decreases.

Hedncld

8th Jan 2006 18:19

Re: EPR on Takeoff

Thanks for the info. I was just alittle confused.

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