clearly has control of the aircraft even though it’s spinning at 250 RPM, but even cooler is the bit where he kills first one then two motors. The results of all this are impressive, if a bit terrifying. This basically imitates the cyclic pitch control of a classic helicopter - a sort of virtual swashplate. From there he was able to come up with a scheme to vary the power to each motor as it moves relative to the reference axis, modulating it in either a sine or cosine function to achieve roll and pitch control.
Through the clever uses of LED strips mounted to the airfoils and some POV magic, he was able to visually indicate a reference axis. First off, had to decide what the front of a spinning aircraft even means. The video below covers the next step: getting pitch, roll, and yaw control over the spinning blades of doom. We’ve seen manage to get this contraption airborne, and hovering is pretty straightforward. The collective pitch of the blades can be controlled via a servo in the hub, and the whole thing can be made to rotate and provide lift thanks to the thrust of tip-mounted motors and props. We’ve been keeping a close eye on ’s cool spinning drone project, which basically eschews a rigid airframe for a set of three airfoils joined to a central hub. But by switching up things a bit, it’s possible to make a multi-rotor drone that keeps on flying even without two-thirds of its motors running.
Unless all its motors are turning and the control electronics are doing their thing, most UAVs are quickly destined to become UGVs, and generally in spectacular fashion. Most multi-rotor aircraft are about as aerodynamic as a brick.
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