See also - Tiny budget spy plane made from PCBs

'The US Navy has tested a spy-in-the-sky glider 30cm across made from circuit boards. "Its lack of a motor and small size make it nearly undetectable in flight," said the US Naval Research Laboratory. Called Close-In Covert Autonomous Disposable Aircraft (CICADA), the planes landed within 5m of their targets, despite being released 17km high more than 50km away.'

Last updated: 17 January 2012