10. The Aerocycle
A flying platform, the Aerocycle was built for the US Army as a reconnaissance tool. It was first tested at the Brooklyn Army Terminal in 1955. It was designed to fly up to 70 miles per hour and only require 20 minutes of instruction before a soldier could use it. But the platform proved too accident-prone during the initial test flights, and the project was abandoned.
Which crazy airplane did you like the most?