The MB 90 is a tandem two-seater, featuring a high wing of metallic construction and a steel-tube fuselage, both canvas-covered. It made its maiden flight in June 1932.
Marcel Bloch developed the MB 90 in order to enter Challenge 1932, the third FAI International Tourist Plane Contest. It was a tandem two-seater, featuring a high wing of metallic construction and a steel-tube fuselage, both canvas-covered. Two aircraft were built, the first of which, registered F-AMBO, made its maiden flight in June 1932. Both aircraft were entered for the International Challenge. One was to have been flown by Desmazières, who had completed a Paris-Madagascar flight with René Lefèvre in 1931. They were equipped with 105hp De Havilland Gipsy III engines driving two-blade wooden propellers. Even though the aircraft did not in the end participate in the Challenge, it attracted considerable interest, since the announced speed and ceiling – 220km/h and 6,000m, respectively – could have carried a private pilot over the Alps.
The MB 91, fitted with a 120hp Pobjoy Niagara engine, was presented in 1933. The triangular tail fin was replaced by a rounded design. The machine did not fly and was displayed at the 1932 Show with a Renault engine.
The MB 92 “Grand Tourisme” flew on 9 September 1932, with Zacharie Heu at the controls. Features included a rounded tail fin; 120hp Renault 4 Pei engine (the same as on the famous Stampe), driving a metal propeller; non-parallel struts; and single-piece landing gear braces. The aircraft, registered F-AMQT, was purchased by an individual called Clément.
In July 1933, the MB 90-01 (F-AMBO) belonging to Desmazières returned to flight as the MB 93. It featured a rounded tail fin, divergent struts, triangular rear windows and a 120hp De Havilland Gipsy Major I engine. It enjoyed no more success than its predecessors.