The aircraft was designed around a French-made 12-cylinder Hispano-Suiza 12Ycrs engine with a Hispano-Suiza HS.404 autocannon mounted between the cylinder banks of the engine and firing through the propeller hub. This powerful engine combined with the hub-firing cannon mandated the use of a metal fuselage. Other armament consisted of two synchronised French-made Darne machine guns, mounted under and to each side of the engine. The wing was braced with two struts on each side of the fuselage; the fixed conventional landing gear was spatted and mounted off the wing struts. The fixed tailwheel was also spatted. The enclosed cockpit was located behind the wing. The horizontal stabilizer on each side was braced from below with two rigid braces from the lower tailcone, and tied from above with two flying wires from the vertical stabilizer. The three-bladed propeller was manually adjustable in pitch.