Perhaps the word quickstop is confusing albeit I can't imagine why. If it isn't a helicopter what is it?
Good article, which scares me even more especially the para about engine/s failing like: "Autorotations are taught and practiced in simulators with varying degrees of success. The simulators are designed to indicate a crash if any structural load limitations are exceeded; most autorotations end in a red screen. The truth of whether an autorotation is survivable, though, is hard to define. Chances are that an autorotation in an Osprey would be an extremely difficult maneuver, with survival owed more to luck than skill."
Let's tell that to the extremely well trained and valuable people in the back.
Don't get me wrong I think it's a fabulous machine that's possibly the way forward in 50 or so years with an awful lot of limitations.