Settle the Bet

[DCitrus9]

Low bypass (3%) vs high bypass is what I was thinking of when I inserted foot into mouth. I know that the jt8d is a turbofan.

 

[TriStar_drvr]

Hopefully a Tri-Star driver will confirm this, but I think the RB-211 is another one.

That is true on both the -22B and the -524B4 installed on the -100 and -500 series L-1011s. I think a varient of RB-211 is installed in many 757s. As many times as I've ridden in the cockpit of Rolls Royce powered 757s, I can't remember if power is set by EPR or N1. My guess is N1.

 

[TonyC]

Pratt & Whitney TF-33's on the RC-135's I used to fly set EPR's...


(I don't recall any specific numbers about ratios, etc., but I'm sure we called them turbofans....)


Some MD-11's and some Airbus products on our ramps use the P&W 4462's, and they use EPR as the primary reference to set power.

(Again, I don't know specific ratios, but I'm certain they're much higher than the TF-33's)

As the only TRUE direct measure of thrust, I kinda like EPR's.