The Dragonslayer: A heavy fighter forced into desperate roles

Wars & Conflicts · Published 9 October 2026 Swipe more like this →

In short: Designed to escort bombers, the Kawasaki Ki-45 Toryū found itself outclassed by agile single-engine fighters. This forced the Imperial Japanese Army to repurpose the twin-engine craft into a specialized interceptor, eventually leading to devastatingly heavy armament and, in the war's final stages, desperate aerial ramming attacks.

The Ki-45, known as the 'Toryū' or Dragonslayer, began development in 1937 as a response to European twin-engine heavy fighters like the Messerschmitt Bf 110. While the initial Ki-38 mockup failed to meet expectations due to underpowered Ha-20 Otsu engines and nacelle stall issues, the project continued. After switching to the proven Nakajima Ha-25 engine, the design improved significantly. By February 1942, the upgraded Ki-45 Kai was officially adopted by the Imperial Japanese Army.

The aircraft's combat history revealed a stark reality: it could not hold its own in aerial combat against agile, single-engine fighters like the Curtiss P-40. This vulnerability shifted its mission from long-range escort to interception and strike roles. In New Guinea, it served as an anti-ship platform, armed with a 37 mm Type 94 tank gun and two 20 mm cannons, capable of carrying two 250 kg bombs.

As the war progressed, the Ki-45 faced increasingly difficult challenges. Against B-29 Superfortress raids starting in June 1944, the aircraft struggled with altitude performance, even after attempts to reduce fuel and ordnance to increase agility. This led to the use of the aircraft in aerial ramming attacks and kamikaze missions, such as the 2 April 1945 attack on the USS Dickerson. By the spring of 1945, the arrival of American carrier-based fighters and P-51s over Japan effectively ended the Ki-45's career.

Despite these struggles, the Ki-45 saw notable successes in specialized roles. A night-fighter variant, the Ki-45 Kai D, was developed to combat nighttime raids, though production difficulties prevented its intended centimetric radar from being installed. Nevertheless, one Ki-45 sentai claimed 150 victories, including eight B-29s, during its service.

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