VRS
It was never fully shown to me. During my PPL and in the Robinson Safety course only the on set (vibrations), recovery was explained, not shown.
I got since then several full blown VRS's, mostly while doing high altitude hover pedal turns. As been discussed before in other threads this is due to of a tail-rotor wake interaction that increases the risk (R44-B206), see other suggestions of flying backwards.
Happy that VRS was explained to me, the explained recovery worked nicely...
Need to show? Personally I don't think so, one can just do a high altitude hover (2k+) and kind of show what to do without actually provoking a full blown VRS.
m2c
d3