Nakajima Type 1 Fighter Hayabusa / Ki-43 (Oscar)
Built by Nakajima. This aircraft was designed by Hideo Itokawa in response to an response to a Japanese Army Air Force (JAAF) specification in December 1937 to replace the Ki-27 Nate. Designed by the Japanese Army Air Force (JAAF) as Type 1 Fighter / Ki-43 Oscar. Nicknamed by the Japanese Hayabusa (Peregrine Falcon). Code named "Oscar" by the Allies. During the Pacific War, this was the primary JAAF fighter with incredible
maneuverability and a fast rate of climb but was vulnerable to enemy fire,
and its armament was insufficient for bringing down
heavily armored Allied aircraft.
Ki-43-I (Type 1, Model I)
Powered by a Nakajima Ha-25 radial engine with a two-bladed engine. Armed with two 7.7mm Type 89 machine guns or one 7.7mm Type 89 machine gun and one 12.7mm Ho-103 machine gun. All Nakajima built production Ki-43-I (Model 1) aircraft had three-digit manufacture numbers. Ki-43-I Oscar manufacture numbers were coded by adding +100 to the true serial number. For example, Ki-43-I 750 was the 650th Oscar produced. Ki-43 (Model 1) aircraft built by the Army Air Arsenal with four-digit manufacture numbers.
Ki-43-II (Type 1, Model II)
Power was provided by a Nakajima Ha-115 with a three-bladed engine. All Nakajima built production Ki-43-II (Model 2) aircraft had four-digit MNs. Ki-43-II Oscar manufacture numbers were coded by adding +5000 to the true serial number. Tachikawa Ki-43 (Model 2) aircraft had five-digit MNs.
Ki-43-III (Type 1, Model III)
Two 12.7mm machine guns. Powered by a Nakajima Ha-115-II radial engine capable of 920 kW (1,230 hp). Tachikawa Ki-43 (Model 3) aircraft had four-digit MNs.
A total of 5,919 were built by Nakajima, Army Air Arsenal and Tachikawa.