TYPE: Heavy fighter
ACCOMMODATION: Pilot only
POWER PLANT: One Kawasaki Ha-201 coupled liquid-cooled engines, rated at 2,350 hp
PERFORMANCE: 430 mph at 16.000 ft
COMMENT: The Kawasaki Ki-64, Allied code name “Rob”, was a one-off prototype of an experimental heavy, single seat, fighter. It had two unusual design features. First; it had two Kawasaki Ha-40 engines in tandem; one in the aircraft nose, the other behind the cockpit, both being connected by a drive shaft. This combination, called the Kawasaki Ha-201, drove two, three-bladed, contra-rotating propellers. The second feature was the use of the wing surface as a radiator for the water-cooled engines. The aircraft first flew in December 1943. During the fifth flight, the rear engine caught fire; and while the aircraft made an emergency landing, it was damaged. The aircraft was subsequently abandoned in mid-1944 in favour of more promising projects. The airframe survived the war, and parts of the unique cooling system were sent to Wright Field in the US for examination (Ref.: 24).