The SAI-Ambrosini SS.4 was an Italian fighter prototype developed in the late 1930s, featuring a canard-style wing layout and a pusher propeller.

SS.3 Anitra ("Duck"[a]), light aircraft built by Stabilimento Costruzioni Aeronautiche at Guidonia (a new municipality and location of a large Italian air force base).

The single-seat SS.2 had a canard wing configuration, fixed undercarriage, and was powered by a two-cylinder Keller engine rated at 16 hp (11.93 kW).

The SS.2 first flew in 1935, and one of the two prototypes was converted into a two-seater with a larger 38 hp (28.34 kW) CNA II engine built by Compagnia Nazionale Aeronautica.

[1] The pilot was accommodated in an enclosed cockpit in the centre of the fuselage forward of the two fuel tanks and aft of the armament in the nose.

[1] The moderately swept, tapered, high-aspect ratio wings had no sweep on the trailing edge and a cut-back to give clearance for the propeller, with the large fins with rudders extending past the trailing edge at the ends of the cut-backs, to ensure enough moment to give adequate control and stability.

The investigation into the crash concluded that the accident was due to imperfect construction, which led to a faulty installation of the aileron that had failed.