Chinese researchers have developed a drone with wings made from bamboo, making it 20 per cent lighter and considerably cheaper than a carbon fibre device, according to state news agency Xinhua. The bamboo-based material used in the unmanned aerial vehicle (UAV) cost about a quarter of the price of carbon fibre cloth, Xinhua said. The UAV completed its maiden flight in northern China last month. The research team said the new material could cut a drone’s overall structural costs by more than 20...