Quaternium, a number one European model of long-endurance multirotors, has flown for  4 hours and 40 minutes with their HYBRiX.20 fuel-electric quadcopter. They consider that this flight time beats any former demonstration ever made with an electrical, hybrid of hydrogen multicopter HYBRiX.20 RPA was designed by Quaternium in 2014 and its first mannequin was in-built

This article sources data from sUAS News – The Business of Drones

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This article sources data from Droneward.org