It was a refined to be a slightly larger version of the B-6, replacing the skids with a tricycle undercarriage, and adding a single large fin to the rear of the aircraft.

The B-7 was first towed aloft on 17 June 1955, and on 6 December that year, Bensen flew a motorized version designated the B-7M, a fully autonomous autogyro.

The prototype B-7M crashed three days later with Bensen at the controls.

Although the machine was soon repaired and in the air again, the incident set Bensen to work on further refinements to the design that would eventually lead to the B-8.

Data from: Jane's All the World's Aircraft 1958-59[1] Data from Jane's All the World's Aircraft 1958-59[1]General characteristics Performance