The Morane-Saulnier BB was a French single-engine biplane fighter aircraft that was designed and produced by the Morane-Saulnier company in the late 1910s and early 1920s. The BB was a development of the earlier Morane-Saulnier N and was designed to be a faster and more maneuverable aircraft.

The BB had a wooden frame covered in fabric and was powered by a 300-horsepower Hispano-Suiza 8Ba V8 engine. It had a wingspan of 8.65 meters and a length of 6.32 meters. The aircraft was armed with two .303 Vickers machine guns, which were mounted in the fuselage and synchronized to fire through the propeller arc.

The Morane-Saulnier BB was known for its speed and maneuverability, and it was a significant improvement over earlier aircraft such as the N. The BB’s top speed was around 230 kilometers per hour, making it one of the fastest aircraft of its time. Its agility and speed made it an effective interceptor aircraft, and it saw significant use in combat during the early 1920s.

The Morane-Saulnier BB was used by a number of air forces, including the French Air Force, the Polish Air Force, and the Soviet Air Force. It was particularly effective in aerial combat, where its speed and maneuverability allowed it to outmaneuver and outfight its opponents. The aircraft’s success in combat helped to establish the biplane as the dominant design for fighter aircraft in the 1920s.