cannons. Ki-44-III Otsu (Ki-44-IIIb) Proposed variant with armament of two 20 mm Ho-5 cannons and two 37 mm (1.46 in) Ho-203 cannons. Total production: 1,227 Operators Wartime Manchukuo Air Force Imperial Japanese Army Air Force No. 9 Hikō Sentai IJAAF No. 22 Hikō Sentai IJAAF No. 23 Hikō Sentai IJAAF No. 29 Hikō Sentai IJAAF No. 47 Dokuritsu Hikō Chutai IJAAF/Hikō Sentai IJAAF No. 59 Hikō Sentai IJAAF No. 64 Hikō Sentai IJAAF No. 70 Hikō Sentai IJAAF No. 85 Hikō Sentai IJAAF No. 87 Hikō Sentai IJAAF No. 104 Hikō Sentai IJAAF No. 246 Hikō Sentai IJAAF Akeno Army Flight Training School Hitachi Army Flight Training School Post-War Chinese Nationalist Air Force operated some captured aircraft No. 18 Chungtui (中隊 ~ Squadron) CNAF October 1945 – August 1946 Specifications (Ki-44-II Otsu) See also References Citations Bibliography (new edition 1987 by Putnam Aeronautical Books, .) Green, William. War Planes of the Second World War, Volume Three: Fighters. London: Macdonald & Co. (Publishers) Ltd., 1961 (seventh impression 1973). . Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: Japanese Army Fighters, Part 2. London: Macdonald and Jane's Publishers Ltd., 1977. . "Nakajima Ki.44 (Ni Shiki Tansen Sentoki Shoki)" (in Japanese). Maru Mechanic No. 9, March 1978. Low-wing aircraft Ki-044, Nakajima Ki-044, Nakajima Ki-044 Single-engined tractor aircraft Aircraft first flown in 1940