After a predetermined length of time, the engine shut off and
the wings were released, causing the Bug to plunge to earth where
its 180 pounds of explosive detonated.
Kettering Aerial Torpedo
Charles F. Kettering of Dayton, Ohio, invented the unmanned Kettering Aerial Torpedo, nicknamed the Bug in 1917. It had a system of internal pre-set pneumatic and electrical controls stabilized and guided it toward a target.