Comment on "Efficiency: Perfect pitch UAVs and airboats lead to new propellers (at least some good from UAVs / Drones)"
...ventury creating enourmous thrust. changing that to the more bird like flight the wing acts like a super efiecient propeller with very little drag. the short winged sparrow has...Comment on "Several Trike Flying Days in Three Minutes"
...net flapping all over the place (no).... @Knussear, I think his beam is shorter and he held it straight forward on take off and landing (less drag) & used the control bar f...