Single seat interceptor fighter
Allied Code Name: Rob

Number Produced: 1 Prototype
Powerplant:
Model: Kawasaki Ha.201*
Type: 24-Cylinder inverted Vee liquid cooled , 2,350 hp 
(Two Ha.40 (DB 601A) engines coupled together.)

	  	Performance:
Maximum Speed at 16,400 ft.: 429 mph
Service Ceiling: 39,370 ft.
Range: 620 miles
Armament: Four 20mm type Ho-5 cannon.

The Ki.64 was developed for the Japanese Army Air Force and was one of the most innovative Japanese designs of the war. Original conceived of in 1939, the Ki.64 had contra-rotating propellors coupled to tandem mounted engines and equipped with an evaporative cooling system.
    While oriinally proposed in 1939, development didn't begin until October 1940 with the prototype being completed in December 1943. Unfortunately the prototype was damaged during testing which delayed further development. Problems also arose with the contra-rotating propeller which were never really overcome.   
    Though a later version using a 2880 HP HA201 engine was projected to reach 495MPH priorities late in the war caused the project to be shelved.