Thanks mutt,
well what I am looking for is which of the two engine is providing more thrust. Bascially I am looking at two different airframe/engine settings for a B744, where the one with the GE engines is always faster than the other one.
I don't say it is the engines, since there is a couple of other factors that also contribute, but I was wondering whether the PW4056 would be less efficient than the GE one.
Cheers
fcit