Hi Reverse Flight
I think it’s such good and rare footage that Robinson are sure to incorporate it in their safety course. It’s great to show to students and get them to discuss as a group what went wrong and what action should have been taken.
When teaching, I demonstrate loss of tail rotor in the hover/at low air speed, and rolling off certainly kills the spin. And I also try to teach that the horn is a warning rather than a command. Still, if it goes off unexpectedly and you’re somewhere between 97 and 80? %, you have to fall back to drill. You don’t have time to analyse, interpret and react: roll on and lower: Robinson tells us to lead with the throttle during the recovery action.
The values you mention for establishing autorotation are a bit lower than I would have expected: are they perhaps for an R22 which needs to move less air to get the RRPM back?
Regards
TT