High Quality Content by WIKIPEDIA articles! The Savoia-Marchetti S.73 was an Italian three-engine airliner that flew in the 1930s and early 1940s. The aircraft entered service in March 1935 with a production run of 48 aircraft. Four were exported to Belgium for SABENA, while seven others were produced by SABCA. The main customer was the Italian airline Ala Littoria. The aircraft was developed in only four months, thanks to the use of the S.55 wing, combined with a much more conventional fuselage. Developed in parallel with a bomber version (the SM.81 Pipistrello) the prototype S.73 first flew on 4 July 1934 from Cameri, with Adriano Bacula as test pilot. The prototype had a four-blade wooden propeller on the central engine, and two-blade wooden propellers on each wing engine. Later all aircraft were fitted with three-blade metal propellers.

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