A report by the Volpe National Transportation Systems Center, of Cambridge, Massachusetts, in the US, estimates that the number of civilian unmanned aircraft will reach 175 000 by 2035. It expects most of these to be smaller models. Pictured above is SteadiDrone director Duran de Villiers flying the SteadiDrone QU4D aerial drone fitted with a GoPro video camera in a field in Knysna, South Africa.