A man identified only as JetTurbine101 on his YouTube channel has been test flying a 54-propeller multi-rotor craft for the last year. We see it evolving from back-yard flying to more open-air, higher moments in the videos below. His August 29, 2015 video includes the most detailed description of the Swarm man-carrying device so far. JetTurbine man groups its counter-rotating propellers into six control channels with KK2.15 stabilization, the KK2 unit being a miniature autopilot normally used on model hobby craft. The aircraft has a takeoff weight of 148 kilograms (325.6 pounds) and a claimed maximum lift of 164 kilograms (360.8 pounds). Its combined motor power of approximately 22 kilowatts (29.5 horsepower) runs the battery pack down in 10 minutes. He says the machine is, “Just a bit of fun for myself, never intended for making a significant journey or flying much above head height.” The Swarm’s approximate cost is £6000 ($9,180). He explains the Swarm’s layout, partly as a …