the p.s.7 was an oversized, three bay biplane, developed from the preceding paul schmitt aerobus. each wing bay was divided by addition braces in the same manner as the spad vii so as to look like a 6 bay biplane. its fuselage consisted of a fabric-covered wooden frame, while the flying surfaces were similarly constructed. the engine was mounted on a metal mount, covered with metal panels and equipped with a frontal radiator. the pilot and observer were placed behind the wings, while the fuel and oil tanks were located ahead of the pilot, directly behind the renault 12 engine.