page_title: Nakajima Ki-49
section_title: Variants
hierarchical_section_title: Nakajima Ki-49 / Variants
caption_attribution_description: English: Two Nakajima Ki.49 Donryu 'Helen' aircraft in a hangar at Kalidjati airfield, Java. In the background is a Haysku Shuki bomber aircraft. Many enemy aircraft, flown by Japanese aircrew, were used by the Royal Air Force following the Japanese surrender.
context_page_description: The Nakajima Ki-49 Donryu "Storm Dragon" was a twin-engine Japanese bomber aircraft of World War II. The type was designed to carry daylight bombing missions, without the protection of escort fighters. Consequently, while its official name, Army Type 100 Heavy Bomber, was accurate in regard to its formidable defensive armament and armor, these features also restricted the Ki 49 to payloads comparable to those of lighter medium bombers – the initial production variant could carry only 1,000 kg of bombs.
  A mid-wing, cantilever monoplane of all-metal construction, the Ki-49 was one of the first Japanese aircraft fitted with a retractable tailwheel. During World War II, it was known to the Allies by the reporting name "Helen".
context_section_description: Ki-49
  Prototypes and pre-series models with a 708 kW (950 hp) Nakajima Ha-5 KAI or the 1,250 hp Ha-4. The pre-series with little modifications from the prototype.
  Ki-49-I
  Army Type 100 Heavy Bomber Model 1, first production version.
  Ki-49-II
  Two prototypes fitted with two Nakajima Ha-109 radial piston engines.
  Ki-49-IIa
  Army Type 100 Heavy Bomber Model 2A - Production version with Ha-109 engines and armament as Model 1.
  Ki-49-IIb
  Version of Model 2 with 12.7 mm Ho-103 machine gunes replacing rifle calibre weapons.
  Ki-49-III
  Six prototypes fitted with two 1,805 kW (2,420 hp) Nakajima Ha-117 engines.
  Ki-58
  Escort fighter with Ha-109 engines, 5 x 20 mm cannon, 3 x 12.7 mm (0.5 in) machine guns. 3 prototypes built.
  Ki-80
  Specialised pathfinder aircraft - 2 prototypes; employed as engine test-beds.
  Total production: all versions 819 examples (including 50 built by Tachikawa)
caption: British troops inspect captured Ki-49's at Kalidjati airfield, Java shortly after liberation 1945
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