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.