From 1914 Caproni had produced a series of multi-engined bombers, several of which served in numbers with the Italian Air Force.
The Ca.66 had a biplane horizontal tail with curved leading edges, its planes braced to each other with parallel pairs of vertical struts on each side.
[1][2] The mainwheels of the Caproni's conventional landing gear were on independent cranked axles from the lower longerons which positioned them under the engines, 3.52 m (11 ft 7 in) apart.
[2] The undercarriage struts, as well as those mounting the engines, were designed to be faired-in but the few known photographs of the Ca.66, unlike the three-views, do not show fairings in place.
Despite its origins in the 1922 programme, leading some sources[3] to state that the first flight was in that year, the French journal Les Ailes referred to it as a "new Caproni" in October 1924.