EPR vs N1
I wonder If anyone can tell me why RR persist with producing engines with EPR as the thrust setting parameter? The only reason I ask is that either on the 744 or 777 that are showing their age (some) the target EPR setting often means the n1 spools are considerably out giving that horrible prop out of phase beat effect which is becoming complained about by passengers and is fatiguing and stressful for crew when on Long haul ops. Taking the a/t out is not recommended on the 777 and I can now only liken it to a form chinese water torture !!