The “Hoch-Tief-Doppeldecker” built by the “Deutsche Sommer Flugzeugwerke GmbH” at Frankfurt-Rebstock in 1912. This machine was designed by Robert Sommer and had a circular fuselage, was powered by a 70 hp Hoffmann “Rotor” 7-cylinder engine. The lower wings were attached direct to the landing gear, therefore there was some space between wings and body.
All Aero 