There were actually a bunch of vehicles designed for the army in the 1950s that were just to complicated for human pilots... http://en.m.wikipedia.org/wiki/Pias

There were actually a bunch of vehicles designed for the army in the 1950s that were just to complicated for human pilots... http://en.m.wikipedia.org/wiki/Piasecki_VZ-8_Airgeep http://en.m.wikipedia.org/wiki/Piasecki_VZ-8_Airgeep