Short cabane struts held the centre of the upper wing a little above the fuselage; the pilot's open cockpit was under the trailing edge, where there was a shallow cut-out to improve his upward view.

[1] The fighter was powered by a 220 kW (300 hp) Hispano-Suiza 8Fb water-cooled V-8 engine in a round-profiled nose with a large, domed spinner.

A pair of forward firing, synchronised 7.7 mm (0.303 in) machine guns were within the cowling above the engine.

The fin was also relatively small compared with the rudder, which was rounded, deep and extended to the keel; it operated in an elevator cut-out.

[1] The Descamps 27 performed well in government comparative trials of it and other single seat fighters but the Nieuport 29 was preferred and went into production.