Borel C.A.P. 2

The Borel C.A.P. 2, later SGCIM C.A.P. 2, was a prototype, all-metal framed, high-altitude sesquiplane fighter and reconnaissance aircraft with a supercharged engine, built in France around 1920. It was displayed, uncovered, at the 1922 Paris Salon.

Design and development
The C.A.P. 2 shared many external features with the earlier Borel-Boccacio Type 3000, or Borel C.2, a two-seat fighter tested too late for World War I, in 1919. Intended for high altitudes, the C.A.P. 2 had a wing area increased by 23% through an increase in span and was also about 1 m longer. However, unlike the wood-framed C.2, the C.A.P. 2 had a fabric covered all-metal duralumin structure.

It was a two-bay sesquiplane, with 4° of wing sweep and two parallel spars in each of the equal span wings, though the lower wing had 63% of the chord of the top wing. The top wing had 2° of dihedral and the lower wing none.

The C.A.P. 2 was powered by an upright, water-cooled, Hispano-Suiza V-8 engine fitted with a Rateau supercharger. Behind the engine the fuselage was flat-sided and constructed around four longerons, interconnected by frames. There were two open cockpits which were fitted with dual controls. The pilot sat forward under a cut-out in the upper wing trailing edge, and the lower wing also had a cut-out which together, increased the field of view. The rear cockpit was to the rear of the wing and was provided with a gun-ring. Dual controls allowed the gunner to take over in an emergency. The tail was conventional, with a broad-chord, triangular fin which carried a broad rudder of rounded profile which extended down to the lower longerons. Its semi-elliptical tailplane was mounted on top of the fuselage and braced from below with a pair of parallel struts. The elevators were rounded in plan, with a gap between for rudder movement.

The fighter had a conventional fixed undercarriage with wheels on a single axle joined by rubber links to a transverse strut mounted on the lower longerons by a V-strut at each end. Its tailskid was wood, unlike the rest of the structure.

Operational history
It is not known if the C.A.P. 2 was ever flown. It had arrived too late for World War I and may have been exhibited at the 1922 Salon solely for its metal construction, then quite novel. No records of it are known from after the Salon.