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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. …