The Mainz Motor School airplane, known as the “One and a Half Decker” was built at the German Motor School at Mainz, Germany. The upper wing of this two-decker had 10 m span, the lower deck 7 m. The 50 hp Argus engine was placed in the front of the fuselage and drove the pusher propeller by means of a transmission. In the gondola-like cockpit there was space for the pilot and two passengers. Radiators were fixed on both sides of the fuselage.