Original Message

The simplest way to demo VRS is to be straight and level at roughly max endurance airspeed and power setting.  Leave the collective there and pitch up a few degrees and just wait.  You may climb a little, and then descend a little, but maintain that attitude as airspeed bleeds off.  It doesn't seem like much should happen, but every helicopter will walk into VRS this way as it slides further off the backside of the power curve.  Some helicopters enter VRS very smoothly and give very little indication aside from altimeter/VSI.

Headwind/tailwind doesn't matter for the demo because you're not maneuvering based on ground references.  But yes, trying to land w/ a tailwind using the same sight picture as headwind/no-wind approaches while ignoring/forgetting airspeed and rate of descent can easily send you toward VRS.

https://youtu.be/mP72wdgq5PU?t=61