A high-flying drone sets an endurance record

Dawn's early light ON AUGUST 6th a flimsy-looking pilotless aircraft, the Zephyr S, came slowly in to land at an undisclosed location in Arizona, and was caught by a group of people jogging along beside it. The reception committee was needed because the craft, which weighs less than 75kg, lacks an undercarriage--or, indeed, anything else that would add unnecessary weight. The touchdown meant the Zephyr S had set a new flight-endurance record for a drone, of 25 days, 23 hours and 57 minutes. The ...