The cargo hauling aircraft with no pilots on board:.

Svilen Rangelov sports an impressive beard. It's eight years' worth of growth he says. The beard dates back to when he and his younger brother, an aerospace engineer by training, formed Dronamics as Europe's answer to the emerging market for cargo drones. He agreed with his brother Konstantin that they would only shave their beards after the first flight of the drone they've been building in their...