Japan Imperial Japanese Army Piston Engine Designations 1932 - 1945 ハ Ha = エンジン Hatsudoki (engine)

Nakajima Ha-1 Army Type 97 radial (Nakajima Ki-27)

Manufacturer Project Designation (Ki Go, Ryaku Go) Official Designation (Seishiki Meisho) Popular Name Notes / Aircraft Mitsubishi A.5 - Army Type 92 Air-cooled Radial - Mitsubishi Army Type 92 Reconnaissance Aircraft, Mitsubishi Ki-7 Mitsubishi A.9 ? ? - Mitsubishi Ka-14 Nakajima NAH Ha-1 Army Type 97 650 hp Air-cooled Radial Kotobuki 寿 Nakajima Ki-27, Nakajima Ki-34, Mitsubishi Ki-7, Mitsubishi Ki-18, Mitsubishi Ki-33 ? Ha-2 Army Type 93 Liquid-cooled Inline - Mitsubishi Ki-1 ? ? Army Type 98 550 hp Air-cooled Radial -- Mitsubishi Ki-2 Mitsubishi, Nakajima NAL Ha-5 Army Type 97 850 hp Air-cooled Radial Zuisei 瑞星 Mitsubishi Ki-21, Mitsubishi Ki-30, Mitsubishi Ki-57, Nakajima Ki-19, Nakajima Ki-49 Donryu Mitsubishi A.14 Ha-6 Army Type ? Kinsei 金星 Mitsubishi Ki-15, Mitsubishi Ki-21, Mitsubishi Ki-30, Nakajima Ki-19 Nakajima NAP Ha-8 Army Type 94 350 hp Air-cooled Radial -- Mitsubishi Ki-2, Mitsubishi Ki-15 Kawasaki Ha-9 Army Type 98 850 hp Liquid-cooled Inline -- Kawasaki Ki-5, Kawasaki Ki-10, Kawasaki Ki-28, Kawasaki Ki-32, Kawasaki Ki-38 Nakajima NAZ Ha-10 Army Type ? Air-cooled Radial -- None known Hitachi, Tokyo Gas & Electric Ha-12 Army Type 95 150 hp Air-cooled Radial Kamikaze 神風 Tachikawa Ki-9, Tachikawa Ki-17 Hitachi Ha-13 Army Type 95 350 hp Air-cooled Radial; Army Type 98 450 hp Air-cooled Radial -- Kokusai Ki-59, Mansyu Ki-79, Tachikawa Ki-9, Tachikawa Ki-36, Tachikawa Ki-54, Tachikawa Ta-Go Nakajima NWE Ha-15 Army Type ? -- None known Nakajima NAR Ha-17 Army Type ? Air-cooled Radial -- None known Nakajima NAS Ha-20 Army Type ? 820 hp Air-cooled Radial -- Scaled-down Bristol Mercury; Kawasaki Ki-45 Toryu Nakajima NAM Ha-25 Army Type 99 950 hp Air-cooled Radial Sakae 栄 Nakajima Ki-43 Hayabusa, Kawasaki Ki-45 Toryu, Kawasaki Ki-48, Kawasaki Ki-56 Mitsubishi A.14 Ha-26 Army Type 99 900 hp Air-cooled Radial Zuisei 瑞星 Kokusai Ki-105 Ohtori, Lockheed Type LO, Mitsubishi Ki-15, Mitsubishi Ki-46 Shitei, Mitsubishi Ki-51 Nakajima NLH-11 Ha-39 Army Type? -- -- Kawasaki Ha-40 Army Type 2 1,175 hp Liquid-cooled Inline -- License-built Daimler-Benz DB601A; Kawasaki Ki-61 Hien Nakajima NAL Ha-41 Army Type 100 1,260 hp Air-cooled Radial -- Nakajima Ki-44 Shoki, Ki-49 Donryu Nakajima BA, NBA Ha-45 Army Type 4 1,900 hp Air-cooled Radial Homare 誉 Nakajima Ki-84 Hayate Nakajima Ha-46 Army Type ? -- Nakajima Ki-87 ? Ha-90 Army Type ? -- ? Mitsubishi Ha-101 Army Type ? Kasei 火星 Mitsubishi Ki-21 Mitsubishi Ha-102 Army Type 101 1,080 hp Air-cooled Radial Zuisei 瑞星 Kawasaki Ki-45 Toryu; Mitsubishi Ki-46 Shitei Nakajima NAK Ha-103 Army Type ? Air-cooled Radial Mamoru 護 -- Mitsubishi Ha-104 Army Type 4 1,900 hp Air-cooled Radial -- Mitsubishi Ki-67 Hiryu, Ki-109 Nakajima NAN Ha-107 Army Type ? Air-cooled Radial -- -- Nakajima NAL Ha-109 Army Type 2 1,450 hp Air-cooled Radial -- Nakajima Ki-44 Shoki, Ki-49 Donryu, Ki-58 Mitsubishi Ha-111 Army Type ? Kasei 火星 ? Mitsubishi A.8 Ha-112 Army Type 4 1,250 hp Air-cooled Radial Kinsei 金星 Nakajima Ki-43 Hayabusa, Ki-116; Mitsubishi Ki-46 Shitei; Kawasaki Ki-96, Ki-100, Ki-102, Ki-108 Nakajima NAM Ha-115 Army Type ? Air-cooled Radial Sakae 栄 Nakajima Ki-43 Hayabusa; Kawasaki Ki-48 Nakajima NAN Ha-117 Army Type ? Air-cooled Radial -- Nakajima Ki-49 Donryu, Ki-80 Kawasaki Ha-140 Army Type ? -- Kawasaki Ki-61 Hien, Ki-64, Ki-88 Kawasaki Ha-201 Army Type ? -- Two Ha-40; Kawasaki Ki-64 Mitsubishi Ha-211 Army Type ? -- Mitsubishi Ki-83 Mitsubishi Ha-214 Army Type ? -- Mitsubishi Ki-67 Hiryu; Giken Ki-93 Nakajima NBD Ha-217 Army Type ? Air-cooled Radial -- Nakajima Ki-87 Nakajima? Ha-219 Army Type ? Kotobuki? No information Nakajima? Ha-505 Army Type ? Kotobuki 寿 Unbuilt 36-cylinder derivative of Ha-219 Manufacturer Project Designation (Ki Go, Ryaku Go) Official Designation (Seishiki Meisho) Popular Name Notes

Hitachi Ha-12 (Tachikawa Ki-17)

Nakajima Ha-45 Army Type 4 1,900 hp Air-cooled Radial Homare 誉

Mitsubishi Ha-102 Army Type 101 1,080 hp Air-cooled Radial Zuisei 瑞星

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