Nakajima Ki-43 Hayabusa (Oscar)

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一式戦闘機 隼

Aircraft Type
Nakajima Ki-43 Hayabusa "Oscar" fighter aircraft of the Imperial Japanese Army
Nakajima Ki-43 Hayabusa "Oscar" fighter aircraft of the Imperial Japanese Army — U.S. National Archives (Public Domain)

The Nakajima Ki-43 Hayabusa was the Imperial Japanese Army's most produced fighter with 5,919 built. Light and exceptionally maneuverable, it served on every Army front from Malaya to Burma and the Home Islands.

Class / type
中島飛行機
Complement
1
Launched
1 January 1939
Commissioned / formed
1 October 1941
Armament
12.7mm Ho-103機銃×2、爆弾250kg（翼下）

History

The Nakajima Ki-43 Hayabusa (一式戦闘機「隼」), codenamed "Oscar" by the Allies, first flew in early January 1939 (December 12, 1938 according to Japanese sources), and entered Army service in October 1941. Designed at Nakajima Aircraft Company by a team under chief designer Yasushi Koyama that included Hideo Itokawa, it was the most widely used IJAAF fighter.

The Ki-43 was extremely light and maneuverable, featuring "butterfly" combat flaps that gave it exceptional turning ability. However, it lacked armor and self-sealing fuel tanks, making it vulnerable. Armed with two 12.7mm Ho-103 machine guns, its firepower was considered inadequate. Despite these shortcomings, skilled pilots achieved remarkable success.

Total production reached 5,919 aircraft across three main variants: the Ki-43-I (roughly 750 built), the Ki-43-II (the most numerous), and the Ki-43-III (built by Tachikawa). The Hayabusa served from the Malaya campaign in December 1941 through to the war's end, operating from Burma to the Philippines to the Home Islands defense.

Related sites (2)

  • Deployed16.866, 96.195

    Mingaladon Airfield, Rangoon, Burma – major Ki-43 operational base during the Burma campaign.

  • Factory36.256, 139.376

    Nakajima Aircraft Ota Factory (中島飛行機太田製作所) – primary Ki-43 production site, Gunma Prefecture.

Sources

  1. Nakajima Ki-43 Hayabusa - WikipediaWebsite
  2. 一式戦闘機 - WikipediaWebsite