The Super Demoiselle carried its pilot within an open framework suspended on struts beneath a parasol wing.[3] A Bede advertisement of the time described "the 'open-air' flying thrill only possible with this type of aircraft."[4] The prototype featured an aerodynamic fairing in front of the pilot's seat though.[3]
Its V-tail was mounted on a boom that extended from the wing,[2] and a single piston engine driving a tractor propeller was mounted on the leading edge of the wing.[2] Although the prototype was fitted with a Continental A65, the design was intended for various engines up to 100 horsepower (75 kW), with a Volkswagen air-cooled engine named as a specific example.[2][4]
It had a fixed, tricycle undercarriage, the main units of which were enclosed in spats on the prototype.[2]
The wing was constructed of 15 identical fiberglass sections mounted on an aluminum spar,[2] the first of Bede's designs to introduce this construction method to the home builder.[1] The same Bede advertisement stated that the wing could be fabricated in a single evening.[4]
The tail boom was constructed from the same material as the wing spar, while the tail surfaces were made from an aluminum honeycomb material.[2] The framework surrounding the pilot's seat was square-section alloy tube.[2]
The entire airframe consisted of only 85 components,[2] and Bede claimed it could be built in just a couple of months for $700 (this price not including engine and accessories.)[4]
The prototype was registered N590A in November 1966 and remained on the FAA registry until cancelled in 1974.[5][a] The design was only offered for sale for a short time, appearing in only a single edition of Jane's All the World's Aircraft, the 1967–68 edition.[6]