Since First World War the Italian Regia Marina finished up being deserved great concentrate on the development of tiny and fast vessels generally speaking armed with torpedoes. The moto torpedo vessels, more called MAS, had been civilian vessels variants. Positive Results accomplished during first World War is at fact remarkable utilising the sankment, regarding Commandant Luigi Rizzo, of Austro-Hungarian Aquatic battleships Wien and Szent István. Neither less were significantly better for limited seas and shallow water just like the Adriatic water, the Italian aquatic proceeded working to enhance the performance of this little but fast moto torpedoes. The MAS 500, prepared fuel machines Isotta-Fraschini, develop during 2nd World War and even more effective and reliable, had been definitely implemented both as moto torpedoes and anti submarine platforms for degree costs dropping. With the capacity of reaching a premier cost of 40 knots and armed with two 450mm torpedoes.
