Originally Posted by
jimjim1
Is that not the engine idle speed? No mystery at all.
Is there not some confusion between N1 and N2 here? Anyway, if the idle N2 is indeed 60% (seems rather low to me) then with Nr below that, yes there will be a little bit of torque from an idling engine, but the engine won't accelerate and the overall effect won't be much in the context of stalled rotors.