X-Plane 10 Charles Kettering Bug. The Kettering Bug was an experimental, unmanned aerial torpedo, a forerunner of present-day cruise missiles. It was capable of striking ground targets up to 121 kilometres (75 miles) from its launch point, while traveling at speeds of 80 kilometres per hour (50 mph). Before trying to fly this aircraft, please view the test flight movies in the link above. The included Readme file contains flying tips and history of the Bug. By Billy Bargagliotti.