Bernardini MB - 3 Tamoyo The Tamoyo is a Brazilian battle tank , Developed by Bernardini in partnership with Technological Center of the Army based on experience gained with the modernization of M41C Caxias . It was never produced in series Description . The Tamoyo is a derivative of M41 , incorporating new technologies and a cannon 90 or 105 mm , while maintaining the features considered by Brazilian Army in M41 . Prototypes were developed in various parts based on parts of the M - 41 , the train rolling and suspension were similar . Unlike EE - T1 Osorio of Engesa , the Tamoyo was a medium tank , and designed according to the needs of the Brazilian Army and the national car park in order to reduce dependence on imported equipment and parts . The Osorio was an MBT , a heavy battle tank was developed for a possible order of Saudi Arabia , And incorporated several imported equipment . Based on the operational requirements established by the Brazilian Army , the Bernardini began developing the new vehicle , originally called X - 30 . The vehicle could not overcome the 30 tonnes limit imposed by road and rail system in Brazil . National companies that were contacted could supply components for the project . Prototypes . The first prototype was completed in 1984 and was designated I Tamoyo . It had suspension by torsion bars , 90mm cannon , engine Scania DSI 14 , rotating mechanism of the tower national transmission CD - 500 - 3 ( the same used in the M - 41 ) and low silhouette . The Tamoyo II aimed to adapt the vehicle to the international market , incorporating more sophisticated imported equipment , among others optronics and a new transmission . The Tamoyo III presented a series of improvements , is easily distinguished from previous models . The Tamoyo is incorporating modern technologies such as armor composed of steel and ceramics , laser rangefinder , night vision and thermal scan direction of fire tower stabilized for firing on the move . The vehicle received the modern cannon of 105mm Royal Ordnance L7 and a V8 Detroit diesel series 92 . The chassis was modified and the tower and the frontal armor was increased , the total weight reached 31 tons Nationalization . With options for a 90mm or 105mm cannon manufacturer claimed that the tank could be used both as a medium armored vehicle recognition , as with the larger 105mm cannon and armor and better engine could form groups of tanks , suitable for confront any threat that could be expected in the South American continent . The Tamoyo could be equipped with a computer shot FERRANTI While the periscope was American , manufactured by the company Kolmorgan . Some of the systems were not installed on board tanks TAM Argentines were at the height reference for the Brazilians . The engine considered for the tank was initially set DA14 Scania engine with power increased to 736cv manufactured by Scania in Brazil . But the possibility of using a motor - GM8V92TA Detroit Diesel was also considered in case the vehicle is exported and there preference for that engine . The great advantage of Tamoyo as a possibility for Brazilian battle tank , was in the large percentage of incorporating components manufactured in Brazil . All armor , tower systems Hydraulic , caterpillars , one of the engines and even the cannon ( for the 90mm ) can be manufactured in Brazil . Some of the other equipment , although international in origin , could be nationalized since the number of systems to acquire and would be sufficient to justify the operation .