A scientist has constructed a flying wind turbine which he hopes to send into the jet stream in fleets to create an airborne power station. Professor Bryan Roberts, from the University of Western Sydney, has spent 20 years planning the concept of flying clusters of his 'gyromill', which looks like a cross between a balsa-wood helicopter and a kite, to generate power from 4.5 kilometres (14,700 feet) up in jet stream, BBC News Online has reported.