Aerodynamic Juggling Sleeves

Human powered flapping flight wont come out of gliding or ornithopters but out of the incremental exaggeration of adaptive winged, full crawl stroke, standing take off, figure-eighting of the arms to cover the full space possible around the body. Once wings are developed for the upper body this way, a set of wings based on this functionality can be made for the legs to allow four winged flight.

Development should start via aerodynamic juggling sleeves.

I have noticed while learning to juggle in still air, that the constant hand motion creates a vortex ring around the body, because you are pushing air up by catching, throwing and cycling your hands. It is an inefficient process though and could be optimized if semi-rigid aerodynamic sleeves were worn.

By filming the paths of the sleeve tips and incrementally shaping them so that they are as adaptive as possible and scoop the most air possible, by watching the video in slow motion and then adding material, an optimal vortex can be achieved. By then eventually losing the balls and simply designing the wings to support full windmilling of the arms rather than just cycling of the hands, an optimal wing shape can be achieved.

Adding weighted tips to the wings to achieve leverage would be a way to increase torque, as would adding energy storing gyroscopes at these weighted points at the ends of the wings.

All told, you may achieve human flapping flight through the judicious development of a pair of aerodynamic juggling sleeves.

I guess a midway step would be to use the juggling sleeves to keep those juggling handkerchiefs floating in the gusts of judiciously sculpted air above your scooping sleeves.