The Savoia-Marchetti SM. 55X could carry a torpedo or bombs under the center of the aircraft.
The construction considered of spruce, ash, and plywood with fabric covered control surfaces.
There were two engines that were placed above the wing.
There were two hulls that were 14' 9" between their centers. The pilot was located in the leading edge.
In the front and back of the hull were gun positions.
In the 1930s there were many long distance trips to North America that were taken by SM.55s that showed that Italy could design excellent aircraft.
By the time of World War II there were only a few SM.55s left and none were used in battle.