And we didn't just throw out that Segway comparison at random -- operators would steer this contraption by "shifting their weight." Oh, and it was amphibious, too. Amazingly, things looked great in development, with Army brass saying the aerocycle was the modern equivalent of cavalry horses. And while having a battalion of flying soldiers riding open, whirling blades into battle sounds awesome, it was sadly not meant to be.
On the plus side, the fate of this aerocycle's pilot lead to the invention of salsa.
They started testing untrained men on the aerocycle prototypes, figuring the intuitive controls would be like riding a bike. And it actually was like riding a bike, in that you have to crash a bunch before you finally figure it out (it didn't help that the craft would pitch wildly in windy conditions). Even testing for the device's parachute went badly. Out of the dozen built, only one survived until the end of the project in 1957. And you know what? We still kind of want one.
This thing was made for beer and aquatic Frisbee golf.