Neat. What I want to see are close-framed, 15 mm thin, 75 g max, 4 wire, ultra-quiet lift modules 20x20 cm to move through buildings at/below background noise levels. vcc, tach, control, and gnd. Toroidal designs show some promise in 3D-printed composites, perhaps of the "flower-Moebius" 5-7 large double blade design with a long chord.
