Japan : Ki-43-II

The single-seater Japanese Nakajima Ki-43 Hayabusa (Peregrine Falcon) fighter was designed to replace the Ki-27 in the Japanese Imperial Army’s Air Force.
The Ki-27 design was so successful that, without resorting to the competition that usually occurred among aircraft manufacturers, the Air Force authorized Nakajima to create an improved model. In autumn of 1942 the Ki-42-IIA entered production. The main differences between the Ki-42-IIA and previous models were its more powerful Ha-115 motor, its 1130 hp output, and its three-bladed propeller. The wings were reinforced to hold 250-kg bombs, and the lighter machine guns were replaced with large-caliber ones.

All in all, 5919 Ki-43 fighters were produced, most of which were of the Ki 43-IIA design.