Cyclogyro: Paddle-Wheel Propeller Designs Take Flight -complete with video of the damned thing hovering.
I don’t think I’d want to be in the same county as a full size unit in flight.
Omni-Directional Lifting aircraft
This one was designed and flown in the 70’s. I don’t see much of a full scale application though. An engine failure would be catastrophic. There’s no way to safely glide or autorotate to the ground. Cool idea, though.
Hey, cool. It can double as combine harvester. The new era of aircraft applications in agriculture is born!
You could dust the crops and harvest them in one pass!