Savoia-Marchetti SM.77

The Savoia-Marchetti SM.77 was an Italian transport seaplane developed by Savoia-Marchetti in the 1930s. It represented the latest development of the double-hull formula that the company began with the S.55 flying boat and continued with the S.66. It differed from the S.66 in having three 800 horsepower (take-off) Alfa Romeo 126 R.C.10 radial engines driving three-bladed variable-pitch propellers, in place of the three Fiat A.24R V-12 engines of the earlier aircraft. Its wing was derived from the one developed for the SM.79, and it also brought several improvements to the hulls and the tail unit. The aircraft belongs to the lineage of Savoia-Marchetti multi-engine flying boats of the interwar years.