Since First World War the Italian Regia Marina had been deserved great focus on the development of little and rapid vessels generally armed with torpedoes. The moto torpedo ships, more called MAS, were civilian vessels variations. The Outcomes achieved during Very First World War were remarkable using the sankment, with respect to Commandant Luigi Rizzo, of Austro-Hungarian Marine battleships Wien and Szent István. Neither less had been considerably better for confined seas and superficial water such as the Adriatic Sea, the Italian Marine proceeded working to improve the performance for the tiny but fast moto torpedoes. The MAS 500, equipped gas machines Isotta-Fraschini, build during 2nd World War and much more powerful and dependable, were implemented both as moto torpedoes and anti submarine platforms for level charges dropping. Capable of reaching a premier rate of 40 knots and armed with two 450mm torpedoes.
