Yup, the only saving grace is that we (plane 4D guys) could use smaller (lighter) blades (prop). I just know, I've had old loose linkages come apart in flight on my heli. Wasn't a major issue as I recall, it just started acting weird and I was able to land it.

Teamsme, mechanically it's just like a helicopter rotor head, totally doable. Just need a bunch of ambition to actually carry it out. If you look at some of these video, it is just a heli tail rotor set-up. Clever, but nothing new, just a new application. It's like the first guy who put a turbo charger on a two-stoke snowmobile.

The real challenge will be in flying the contraption! But that seems to also already have been proven possible.

Eh, this whole inverted hovering thing is already so yesterday.