The nakajima ki 84 quothayatequot was a single seat fighter used by the imperial japanese army air force during world war ii nicknamed quotfrankquot by the allies the ki 84 had excellent performance and high maneuverability and was considered to be the best japanese fighter to see large scale operations during world war ii it was able to match any allied fighter and to intercept the high flying b 29 superfortresses and its powerful armament increased its lethality a great ace that