I'm still curious about TiP's question. Can it auto? If both donks stop, what are your options? Does it land like a FW?
As I understand it, the V22
can autorotate, although the RoD is around 6000 fpm. Should get the pucker factor going
What you really,
really don't want to do is to vortex ring it. At least in a single rotor you'd have some chance of recovery, but with two side by side almost certainly one will go before the other, and that's the end of you . . .