I-16 - Soviet single-engine monoplane fighter of 1930s created by aircraft designer Nikolai Polikarpov’s design bureau. It was the one of the world’s first fighters with landing gear retraction system. It was I-16 which stood the air fighting against famous Messerschmitt Bf 109.
Over a period of its history I-16 was upgraded a lot. New modifications of aircraft were created and adopted almost every year. I-16 type 24 was further development of I-16 type 18.