(prototypes): Kawasaki Ki-61 II KAI modified with a radial engine. 3 converted from Ki-61s. Ki-100-I-Ko: initial production variant, modified from Ki-61 II KAI. 271 converted from Ki-61s. Ki-100-I-Otsu: improved canopy and cut down rear fuselage. 118 built. Ki-100-II (prototypes): powered with a Mitsubishi Ha-112-II Ru fitted with a turbocharger. 3 built. Army Fighter Type 5 Mark Ia: IJA designation for Ki-100-I-Ko Army Fighter Type 5 Mark Ib: IJA designation for Ki-100-I-Otsu Production Note: Production on the Kagamigahara and Ichinomiya aircraft plant were severely hampered by Allied bombing raids. It was planned to produce 200 airframes per month, but the Ichinomiya plant had to be abandoned after its nearly complete destruction. Not included: Three Ki-100-I prototypes were completed in February 1945. Three Ki-100-II prototypes were completed during May to June 1945. Twelve additional Ki-100-I-Otsu were built at the Ichinomiya aircraft plant. Operators Imperial Japanese Army Air Service Surviving aircraft Kawasaki Ki-100-1b s/n 8476M was captured at Tân Sơn Nhứt Airfield, Saigon, in August 1945 in airworthy condition, having only recently been delivered. However it was damaged there on 26 Nov 1945 during a wheels-up landing, after the undercarriage failed to lower for an attempted landing at Biên Hòa airfield, 15 miles away; it was being ferried there by a Japanese pilot for flight tests. The oil cooler, propeller, and tailwheel were repaired but not returned to complete airworthy condition; it was later shipped to the United Kingdom along with three other Japanese aircraft including a Mitsubishi A6M Zero (Zeke) fuselage, a Mitsubishi Ki-46 (Dinah) and a Nippon Kokusai Ki-86 (Cyprus). After years of being in storage in various locations, and being misidentified as a Nakajima Ki-43 (Oscar), it was restored was on display at the RAF Museum in Hendon, United Kingdom. Moved to RAF Museum Cosford on 30 January 2012, though now relocated again to the Hendon museum as of December 2022. Specifications (Ki-100-I-Ko/Otsu Goshikisen ) See also References Citations Bibliography Bueschel, Richard M. Kawasaki Ki.61/Ki.100 Hien in Japanese Army Air Force Service, Aircam Aviation Series No.21. Canterbury, Kent, UK: Osprey Publications Ltd, 1971. . Craven, Wesley and Cate, James The Army Air Forces in World War II Volume Five The Pacific: Matterhorn to Nagasaki June 1944 to August 1945 Chicago: The University of Chicago Press, 1953. ASIN: B000LZHT7Q Ethell, Jeffrey L. Aircraft of World War II. Glasgow, Collins Jane's, 1995. . Francillon, René J. Japanese Aircraft of the Pacific War.