Nakajima Ki-84 “Hayate” (キ84 疾風”Gale”) “Frank”
The prototype flew in March 1943 and in August, fifteen months after the design had been started, the Ki-84-Ia “Hayate” entered series production. The Ki-84-Ib and Ki-84-Ic which followed differed in the armament fitted, the latter being fairly heavily equipped for a Japanese fighter with two 30 mm. and two 20 mm. cannon. Total production of the Nakajima Ki-84-I series amounted to 3513 machines, including a batch of 100 completed by the Manchurian Aircraft Manufacturing Co. The shortage of strategic materials in the final stages of the war led to the investigation of a series of developments and modifications of the original Nakajima Ki-84 “Hayate”, intended to employ wood and/or non strategic metals in their construction. Among these projects were the Ki-84-II, Ki-106 and Ki-113. None of these came to fruition, being either abandoned or too late to achieve completion beyond the prototype stage. The Ki-84-III “Hayate”, which was to have employed a a 2000 hp supercharged Ha-45 ru engine, was likewise too late for completion before the end of the war, as were the Ki-116, Ki-I17 (Ki-84N), Ki-84P and Ki-84R, other engine change projects.