A new hybrid gas-electric aircraft could make drone delivery more practical. Developed by a startup called Top Flight Technologies, the six-rotor drone can fly for more than two-and-a-half hours - or 160 kilometers - carrying a payload weighing nine kilograms.

The aircraft’s range is many times that of any quadcopter on the market - the most popular type of drone for its maneuverability. Almost all quadcopters run on batteries, and can fly for only about 40 minutes between charges with a payload weighing just a couple of kilograms. The new drone can also fly more than twice as far as a radio-controlled, gasoline-powered helicopter of similar size.

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