Takeo Doi (aircraft designer)
Japanese aircraft designer (1904-1996)
Takeo Doi (土井 武夫, Doi Takeo; 31 October 1904 – 24 December 1996) was a Japanese aircraft designer.
He designed many World War II fighter aircraft used by the Imperial Japanese Army Air Force. His most important work was the "Army Type 3 Fighter" (三式戦闘機, Sanshiki sentoki), a.k.a. Kawasaki Ki-61 "Hien" (飛燕, Hi-en) ("flying swallow") or "Tony".
Also he was one of the chief designers of the Nihon Aircraft Manufacturing Corporation (NAMC) YS-11.
Biography
Takeo Doi was born in Yamagata city, Yamagata prefecture, Japan in 1904.
He graduated from the Yamagata Higher School in 1924, and from the Department of Aeronautics, Faculty of Engineering, Tokyo Imperial University in 1927
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Jiro Horikoshi and Hidemasa Kimura, who designed the Mitsubishi A6M Zero fighter and the Koken (Tokyo Imperial University Aeronautical Research Institute) Long-range Research-plane, respectively, were his classmates at the department in the university.
In 1927 Doi started his career at the Aircraft Department of Kawasaki Dockyard Company Limited (Kobe, Japan), which later became Kawasaki Aircraft Company Limited in 1937. These are the predecessors of present Kawasaki Heavy Industries Aerospace Company reorganized in 1969.
Begin with the source’s own compact description: “Takeo Doi (aircraft designer)” is japanese aircraft designer (1904-1996). The dossier treats that line as a proposition to test through Takeo, aircraft and designer, not as a finished interpretation.
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The phrase “japanese aircraft designer (1904-1996)” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The entry’s evidential value lies in the named roles, institutions and publications that can be tested against primary documentation. The source revision retrieved here is dated Jun 21, 2026. The linked authority identifier is Q7678043. VIAF identifies the subject as 110798369. The Library of Congress control number is no2008181554. 3 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1904, 1996, 1924 and 1927.
Later biographies can compress uncertainty and repeat inherited reputations, so apparently settled claims may still require comparison. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Takeo Doi (aircraft designer)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.