Don't forget the little guys
Remember when the RRPM gets to a low setting in an R22 or R44 or a similar piston, you have actually wound down the engine.
The HP lost is roughly the same as the RRPM loss. That is, lose 10% RRPM, engine HP available at full throttle is also down 10%.
No problem at sea level in a derated engine installation, however, at full throttle height or above, the warnig horn can be scary.
Also, low RRPM means the tail rotor is going slower, thus tail rotor thrust is down, a problem in hot, high and humid conditions.
In summary, the little people (machines) are more prone to low RRPM hiccups!
For those younger guys and girls in small things, keep the rotor RPM top of the green,
Later, on the big ones, you can use the preceding tips.
Flying is fun!