U.S., British Militaries May Deploy Flying Saucers. GFS (Geoff’s Flying Saucer) Projects' UAV (unmanned aerial vehicle) can soar high in the air, hover, bank and fly over any terrain, making it ideal for military surveillance. It uses an aerodynamic principle known as the Coanda effect to take off vertically from any solid surface. Geoff Hatton was the engineer and inventor who originally conceived of the idea. You can take it down to a foot in diameter and we are told it is fully scaleable up to a large-sized craft,” said David Steel, director of GFS Projects in Peterborough, England.