A6M1, Type 0 Prototypes The first two A6M1 prototypes were completed in March 1939, powered by the Mitsubishi Zuisei 13 engine with a two-blade propeller. It first flew on 1 April, and passed testing within a remarkably short period. By September, it had already been accepted for Navy testing as the A6M1 Type 0 Carrier Fighter, with the only notable change being a switch to a three-bladed propeller to cure a vibration problem.
A6M1, Type 0 Prototypes The first two A6M1 prototypes were completed in March 1939, powered by the Mitsubishi Zuisei 13 engine with a two-blade propeller. It first flew on 1 April, and passed testing within a remarkably short period. By September, it had already been accepted for Navy testing as the A6M1 Type 0 Carrier Fighter with the only notable change being a switch to a three-bladed propeller to cure a vibration problem.