http://www.gizmag.com/yeair-hybrid-two-stroke-combustion-quadcopter-drone/37713/
"One hour of flight time, a top speed of 100 km/h (62 mph), a payload of 5
kg (11 lb) – these are big figures for a drone, and figures that are
basically out of reach using today's LiPo battery technology. But German
startup Yeair! believes it's possible using a hybrid system in which
each rotor is driven by two motors – an electric, and a two-stroke 10cc
gasoline engine."
Another useful advance for quadcopters. I plan to stick with the smaller versions though.
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