Japan 大日本帝國陸軍航空隊 Dai-Nippon Teikoku Rikugun Kokutai Imperial Japanese Army Air Service 大日本帝國海軍航空隊 Dai-Nippon Teikoku Kaigun Koukuu-tai Imperial Japanese Navy Air Service Aircraft Code Names & Designations 1942 - 1945 ハ Ha = エンジン Hatsudoki (engine): Joint Army-Navy Engines

Mitsubishi Ha-112 Kasei (Ha-33) (Kawasaki Ki-108)

In 1942, the Japanese Ministry of Munitions implemented a designation system for aircraft engines used by both the Imperial Japanese Army and the Imperial Japanese Navy, combining elements of both service's engine designation systems.

• ハ Ha = エンジン Hatsudoki (engine), followed by two digits.
• Engine Class Identification: The first digit represented the engine classification:
  1. Air-cooled inline engine.
  2. Air-cooled single-row radial engine.
  3. Air-cooled 14-cylinder double-row radial engine.
  4. Air-cooled 18-cylinder double-row radial engine.
  5. Air-cooled, more than 18-cylinders, multi-row radial engine.
  6. Liquid-cooled 12-cylinder engine.
  7. Liquid-cooled, more than 12-cylinders engine.
  8. Diesel engine.
  9. Special engine.
• Engine Bore and Stroke Identification: The second digit represented the engine bore and stroke dimension code in millimeters:
  0. 130/160
  1. 140/130
  2. 150/170
  3. 140/150
  4. 140/160
  5. 130/150
• Model Number The engine code was followed by a two-digit model number, similar to the numerical series revision code (i.e., 00, 10, 20, etc.) used by the IJN. Example: Mitsubishi Ha-33 62
  • Ha = engine.
  • 3 = air-cooled 14-cylinder double-row radial engine.
  • 3 = 140 mm bore, 150 mm stroke.
  • 62 = Second revision of Kinsei 60 series engine.
  At least one existing IJA engine was assigned the same numerical designation in this joint designation system (Nakajima Ha-45 Homare).

Manufacturer Joint Designation IJA Designation IJN Designation Notes / Aircraft Hitachi (Nakajima?) Ha-23 - - Mansyu Ki-79 Mitsubishi Ha-31 Ha-26, Ha-102 Zuisei 瑞星 MK2 Zuisei 瑞星 Aichi E12A, Kawasaki Ki-45 Toryu, Kawanishi E7K, Kokusai Ki-105 Ohtori, Lockheed Type LO, Mitsubishi C5M, Mitsubishi F1M, Mitsubishi A6M, Mitsubishi Ki-15, Mitsubishi Ki-46 Shitei, Mitsubishi Ki-51 Mitsubishi Ha-32 - MK4 Kasei 火星 Kawanishi H8K, Kawanishi E15K Shiun, Kawanishi N1K Kyofu, Mitsubishi G4M, Mitsubishi J2M Raiden, Nakajima G5N Shinzan, Nakajima B6N Tenzan, Kugisho P1Y Ginga Mitsubishi A.8 Ha-33 Ha-112 Kinsei 金星 MK8 Kinsei 金星 Kawasaki Ki-96, Kawasaki Ki-100, Kawasaki Ki-102, Kawasaki Ki-108, Mitsubishi Ki-46 Shitei, Nakajima Ki-43 Hayabusa, Nakajima Ki-116 Nakajima NAL Ha-34 Ha-109 -- Nakajima Ki-44 Shoki, Nakajima Ki-49 Donryu, Nakajima Ki-58 Nakajima 23 Ha-35 Ha-115 Sakae 栄 NK1 Sakae 栄 Mansyu Ki-79, Mitsubishi C5M, Mitsubishi A5M, Mitsubishi A6M, Nakajima Ki-43 Hayabusa, Nakajima Ki-115 Tsurugi, Nakajima B5N, Nakajima J1N Gekko Mitsubishi Ha-43 Ha-211 MK9 Aichi B7A Ryusei, Kawanishi N1K Shiden, Kawanishi J3K, Kugisho P1Y Ginga, Kyushu J7W Shinden, Mansyu Ki-98, Mitsubishi A7M Reppu, Mitsubishi J4M Senden, Mitsubishi Ki-83, Tachikawa Ki-70, Tachikawa Ki-74 Nakajima NBH Ha-44 - - Nakajima Ki-84 Hayate, Nakajima Ki-87, Tachikawa Ki-94 Nakajima BA, NBA Ha-45 Ha-45 Homare 誉 NK9 Homare 誉 Kawanishi N1K Shiden, Nakajima Ki-84 Hayate Hitachi, Tokyo Gasu Denki Ha-47 - GK4 Hatsukaze 初風 Heinkel Hirth HM 504; Kokusai Ki-86, Kokusai Ta-Go, Kyushu K9W, Tokyo Koku Ki-107 Nakajima Ha-51 - - Experimental 22-cylinder derivative of Ha-45 Homare 誉 Nakajima? Ha-54 - - Unbuilt 36-cylinder derivative of Ha-219 Kotobuki 寿 Kawasaki Ha-60 Ha-40 -- License-built Daimler-Benz DB601A; Kawasaki Ki-61 Hien, Nakajima Ki-62 Aichi Ha-70 - - Kugisho R2Y Keiun Kawasaki Ha-72 Ha-201 - Kawasaki Ki-64 Kugisho Ha-73 - YE2 Experimental 18-cylinder inline-W Kugisho Ha-74 - YE3 Experimental 24-cylinder inline-X derivative of YE2 Manufacturer Joint Designation IJN Designation IJA Designation Notes / Aircraft

Mitsubishi Ha-32 (MK4 Kasei 火星)

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