Control seems to be achieved for a Qaudrotor collective pitch powered quad and the results are remarkable. https://m.youtube.com/watch?v=TnGhEInTXYc . I wonder what could be achieved with unpowered rotors with a pusher or puller prop.
Wow! That thing is cool. I had to watch it twice to wrap my head around how the reversible pitch blades function in flight. If they could build one to carry a pilot you could make a killing at airshows.Whirlybird121;n1142410 said: