|FIGHTER||Virtual Aircraft Museum / Japan / Tachikawa|
On 8 September 1943, instructions were issued to redesign the Nakajima Ki-84 Hayate all-metal single-seat fighter (which see) for wooden construction because of the increasingly critical light alloy supply situation. The task of redesigning the airframe was assigned to the Tachikawa Hikoki which was to collaborate with the Army Aerotechnical Research Institute at Tachikawa. Assigned the designation Ki-106, the wooden fighter was intended to utilise a high proportion of semi-skilled labour in its construction and to be broken down into components to be built by small wood-working shops grouped around designated assembly points. Prototype construction was sub-contracted to Ohjo Koku, but the first of three prototypes was not flown until July 1945. The external characteristics of the Ki-84 were faithfully retained by the Ki-106, apart from some minor revision of the vertical tail, the first prototype being powered by the 2,000 hp Nakajima Ha-45-21 engine and carrying an armament of four 20-mm cannon. Appreciably heavier than the standard Ki-84, the Ki-106 was subjected to various weight saving measures, one of these being a reduction in the armament to two 20-mm cannon, and the second prototype flew with this armament during the last week of the war. Max speed, 385mph (620km/h) at 21,325ft (6 500m). Time to 16,405ft (5 000m), 7.85min. Normal range, 497mis (800 km)plus 1.5 hrs. Empty weight, 6,499 lb (2 948 kg). Loaded weight, 8,5981b (3 900 kg). Dimensions as for Ki-84 apart from height of 11 ft 9VA in (3,59 m).