I may be taking things a little off-course here, but can anyone enlighten me on the subject of vortex ring? I have flown helicopters at two difference schools (I now have the grand total of 11-ish hours rotary time).
At one place, the first thing they said to me, while we're preparing the coffee, not even seen the a/c, is AVOID THE VORTEX RING STATE. Below thirty knots, DO NOT let the ROD get beyond 500fpm. I later calculated this equates to an angle of six degrees.
At the second place, it did not have the same emphasis. Bailey volume 1 describes it as though you do all the wrong things and then recover, like incipient spin recovery in a fixed-wing. I've also seen a description of VR as airflow attaching and disappearing in a flickering manner the entire length of the blade (wind-tunnel tests thankfully), which sounds like something one would want to avoid.
Can anyone wise me up? Moderator, don't hesitate to squash this if you think it's inappropriate.