The HZ-1 Aerocycle - known as the ‘motorcylce of the air’ was one of several single person flying platforms that the U.S. Army looked into during the 1950s and 60s.
The Aerocycle carried a single pilot and its engine on a circular platform, all of which was located just above two 15-foot long rotating propellers. The craft’s pilot would stand toward the rear of the platform, secured by a tether attached to the steering column.
Single person flying platforms were going to be used for reconnaissance missions. The belief was that they were easy to pilot so little experience was needed to operate one. They learned otherwise during the testing phase when two pilots crashed because the Aerocycle was ‘too hard to steer without experience’.