Latitude Engineering successfully surpassed the world record for time aloft of a vertical takeoff and landing aircraft using its HQ-60 Hybrid Quadrotor UAV. The HQ-60 flew continuously for a record 2 hours, 29 minutes and 38 seconds, with fuel to spare. The 60cc engine supplied by Power4Flight, Currawong’s US distributor and partner, included Currawong’s electronic fuel injection system.
https://latitudeengineering.com/2016/08/hq-60-sets-new-standard-for-time-aloft/