Nick's stock reasons for the rpm limits:
Power ON upper = mostly engine max qualified N2/Nf
Power ON lower = Minimum droop seen in OEI engine cut at bottom of dead man's curve, often lower than power off
Power Off upper = maximum structural rpm due to centrifugal force (bless you Lu) and or rotor blade tip mach at high speed auto in cold temperatures at low altitude
Power off lower = minimum rpm at bottom collective, low weight, cold temp, low altitude
Last edited by NickLappos; 9th August 2006 at 20:58.