Tatsuo Hasegawa was born in Tottori, Tottori Prefecture on February 8, 1916. After majoring in aerodynamics as a self-supporting student, he graduated from the Section of Aeronautics of the Faculty of Engineering at the Tokyo Imperial University in 1939.
After graduating, he joined Tachikawa Aircraft Corporation and was related to the development of the Tachikawa Ki-94 in 1943 as the chief designer. The high-altitude interceptor aircraft was designed to intercept the bomber, and proposed to the Imperial Japanese Army. One aircraft was completed in August 1945 but before it flew, the World War II ended. Before the start of the development, Hasegawa had designed an airfoil based on his theory, and publishing the paper in the scholarly journal of the Japan Society for Aeronautical Sciences in March, 1942. He named it "TH airfoil theory" after his name. He used the "TH airfoil" to the Ki-94. The idea of this theory is very similar to the Supercritical airfoil theory that NASA created later in the 1960s, thus, when NASA lodged the patent application of the airfoil in Japan in 1979, this patent was not admitted to the agency.
Toyota
He lost job by the end of the war because Japan was prohibited to manufacture the airplane under control of the General Headquarters of General Douglas MacArthur, but, in next year, Hasegawa was employed by Toyota which was recruiting engineers at that time. After he joined Toyota, Hasegawa was involved in the development of the Toyota Crown#First |Toyopet Crown as the sub-chief of the development to support his chief, Kenya Nakamura. At the development for the Crown, the Shusa Organization was introduced first time. It is considered that this system referred to the Chief designer system of the fighter development. Afterwards, he led the developments of the first generation models of Toyota Publica, Sports 800, Corolla, Celica and Carina, as the chief. He also was involved in the Toyopet SKB truck, the precursor to the Toyota Dyna He was promoted to the general manager of the product planning office and senior director, and retired from this industry in 1982.
After Toyota
Hasegawa was a senior consultant to DuPont, Delaware, between 1982 and 1988, where he advised them on the marketing strategy aimed at automobile industry. Detroit Development Center may be one of his contributions. Afterwards, he returned to Japan and concentrating on gardening with roses and cattleyas. On November 15, 2004, he was elected one of 2004 inductees in Japan Automotive Hall of Fame for application of aerodynamics theory to automobile design, and mainstream product planning and management in corporate environment. On April 29, 2008, Tatsuo Hasegawa died aged 92 in Yokohama, Kanagawa.
