eagle86,
You are just spouting the old myths ("to recap - conditions for entry into IVR are 1. low KIAS < 20, 2. ROD > 200ft/min, 3. increasing power from minimum to a lot."
The attempt here is to describe PRECISELY what VRS is and how to know/control/avoid it. It seems that my points below (post #42) are not clear enough.
Some facts:
It is impossible to get VRS at 200 to 300 feet/min rod.
It is impossible to get VRS at 20 knots airspeed
VRS is not a power-caused problem, it has little to do with power.
Over pitching (SWP) is so often confused with VRS that the two are a mish-mash in most pilot's heads, so we get quotes like eagle86 above. The common training guides are of no help, because they repeat the same mish-mash.
hihover,
The variability for different helos and rotors is tied into the disk loading, where low disk loading rotors have less downwash velocity (Vi) and thus can get VRS at a lower rod. Power has little to do with it, your instructor was confusing VRS with SWP, as does eagle86.