Senior Pilot, thanks for the reply.
Reading what you posted, it makes perfect sense; what does not make perfect sense (to me), is why this is not taught as part of the PPL or CPL syllabus (at least never taught to me).
One could argue this is more relevant than some of the other course material.
...honest Mr Instructor, the only reason I was hunting after the RRPM in that last practice auto was because this helicopter was not calibrated correctly for autos
One learns something new every day!