sentences:  It was one of the many flying boats made by SIAI (Savoia-Marchetti), that in 1915 had started building foreign aircraft under licence, followed two years later by the first of its own designs.The SM.78 was developed from the SM.62bis.The prototype, which carried the serial number "MM222", made its first flight late in 1932 and then transferred the next year to Vigna di Valle for evaluation.