I've converted a £10 trash tier quadcopter to run off of 30G wire. Only 5 meters range, and the weight and momentum of the wire cause extremely difficult to control oscillations, but it still flies (badly)! The transmission losses over such thin wires are massive but the way around that is to supply a higher voltage than is required, and include a linear regulator inside the quad to burn off excess voltage when current draw is low.

I specced the wire purely based on the weight reduction I got from stripping out the cameras, battery, and then replacing the main body with a 3D printed skeleton, as the original battery contributed more rigidity than I had realised.