Originally Posted by
megan
The 76 increased rotor RPM from 293 (100%) in the A to 312 RPM (107%) in the C, don't know but presumed it was because the gross went from 10,500 to 11,700.
Allegedly if you ran out of power on the 76 and were below 10400lbs. Beeping from 107 to 100 NR gave a nice torque/N1 boost if you were a bit short.
It was quite substantial, allegedly….
100% Nr must be more efficient. My guess too is the NR related to Gross Take Off. I’d hazard a guess it’s got something to do with the conning angles or RBS. There are plenty here that would know more about that than me and I would be interested in the actual reason if someone wants to share it.