John, I realized that one cannot get any exact correlation. As Smokey made a point to say, approximate.
However it was this “approximate” relationship I was hoping to observe a little closer, and perhaps play around with some formulas to come up with some realistically close Thrust VS rpm calculations. To this end, I’ve recalculated values for Thrust = A * RPM^3.5 + B, where A and B are constants, however they’re not as close as I’d hoped. Changing rpm from % N1 to % N2 didn’t help at all.
Of course, my thrust values may not be all that accurate to start with. And that is why I’m asking if there are any generic, but reasonably accurate, RPM versus Thrust figures out there for any engine.
Do you have any sample computer programs/OEM engine data? I realize they may be proprietary, but surely the older 737’s performance can hardly be a Boeing secret anymore!
Anyone with ideas?
Hawk