Nakajima K-43 Hayabusa, code-named Oscar by the Allies, was the Imperial
Japanese Army's equivalent of the Zero fighter in service with the
Imperial Navy. In combat units the machine replaced the aging Ki-27.
Manufactured in large numbers, the fighter remained in frontline service
until the end of the war. By the time its final version entered
production, the development of its successor - the Ki-84 - had already
started.
The Ki-43 was a very maneuverable machine, but in many areas it was
inferior to its adversaries. Despite its fragile design, poor armament
and almost no armored protection, the Ki-43 was well-liked by the
Japanese pilots and it became a symbol of the Imperial Japanese Army Air
Service.
Hayabusa was the pinnacle of the Japanese fighter design development
until the lessons learned in the Pacific laid the ground for new
approaches to the construction of tactical aircraft.