Nakajima Ki-43 Hayabusa

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Template:Short description Template:Use dmy dates Template:Infobox aircraft

The Nakajima Ki-43 Template:Nihongo, formal Japanese designation Template:Nihongo is a single-engine land-based tactical fighter that was used by the Imperial Japanese Army Air Service in World War II.

The Allied reporting name was "Oscar", but it was often called the "Army Zero" by American pilots because it bore a certain resemblance to the Mitsubishi A6M Zero, the Imperial Japanese Navy's counterpart to the Ki-43.<ref>Template:Harvnb</ref> Both aircraft had generally similar layout and lines, and also used essentially the same Nakajima Sakae radial engine, with similar round cowlings and Bubble canopy (the OscarTemplate:'s being distinctly smaller and having much less framing than the A6M). While relatively easy for a trained eye to tell apart with the "finer" lines of the Ki-43's fuselage – especially towards the tail – and more tapered wing planform, in the heat of battle, given the brief glimpses and distraction of combat, Allied aviators frequently made mistakes in enemy aircraft identification, reportedly having fought "Zeros" in areas where there were no Navy fighters.

Like the Zero, the radial-engined Ki-43 was light and easy to fly and became legendary for its combat performance in East Asia in the early years of the war. It could outmaneuver any opponent, but did not initially have armor or self-sealing fuel tanks, and its armament was poor until its final version, which was produced as late as 1945.<ref name="Ethell1995pp98-99">Template:Harvnb</ref><ref>Green, pp. 77, 78</ref> Allied pilots often reported that the nimble Ki-43s were difficult targets but burned easily or broke apart with a few hits.<ref name="Ethell1995p99">Template:Harvnb</ref>

Total production amounted to 5,919 aircraft, making it the second-most produced Japanese fighter aircraft during the war after the Mitsubishi A6M Zero.<ref name="Glancey2006p173"/> Many of these were used during the last months of the war for kamikaze missions against the American fleet.<ref name="Ethell1995p99"/>

Design and development

The Ki-43 was designed by Hideo Itokawa, who later became famous as a pioneer of Japanese rocketry. The Ki-43 prototype was produced for a December 1937 specification for an interceptor–escort fighter successor to the popular fixed-gear Nakajima Ki-27 'Nate'. The specification called for a top speed of Template:Cvt, a climb rate of Template:Cvt in five minutes and a range of Template:Cvt. Maneuverability was to be at least as good as that of the Ki-27.Template:Sfn

When first flown in early January 1939, the Ki-43 prototype was a disappointment.Template:Sfn Japanese test pilots complained that it was less maneuverable than the Ki-27 and not much faster.<ref name="Peregrine p27">Template:Harvnb</ref> To solve these problems, Nakajima produced a series of progressively modified prototypes through 1939 and 1940. These changes involved a major weight saving program, a slimmer fuselage with the tail surfaces moved further aft and a new canopy. Crucially, the 11th prototype introduced the unique differential "butterfly" maneuvering Fowler flaps, which dramatically improved performance in tight turns. The 13th prototype combined all these changes and tests of this aircraft resulted in an instruction for Nakajima to place the Ki-43 into production, the Ki-27 jigs being transferred to the Mansyu factory at Harbin in Japanese occupied Manchukuo.<ref name="Peregrine p27-8">Template:Harvnb</ref>

The Ki-43 (Oscar) was initially produced in November 1939, given the designation Ki-43-I. Deliveries from Nakajima's Ota factory commenced in February 1941. In addition to outstanding maneuverability, the Ki-43-I had an impressive rate of climb due to its light weight. Power was provided by the Nakajima Ha-25 engine turning a two-bladed, two-position variable-pitch metal propeller.<ref name="Peregrine p28">Template:Harvnb</ref> Top speed was Template:Cvt at Template:Cvt.Template:Sfn The Ki-43 was equipped with two synchronized cowling machine guns in various configurations, with either two Template:Cvt Type 89 machine guns, one Template:Cvt Ho-103 machine gun and one Template:Cvt gun, or two Template:Cvt Ho-103 guns; the aircraft was given various sub-designations to reflect these differences. The configuration that appears to have been most prevalent at the outset of the war was the first configuration with two Template:Cvt Type 89 machine guns, while as the war progressed the heavier combinations gained popularity and the version with the heaviest armament was sometimes given the designation Ki-43-Ic.<ref name= "Dunn"/> The Ho-103 was often loaded with explosive ammunition to increase target effect; its penetrative effect against later Allied aircraft armor appears to have been marginal.<ref name="Dunn">Dunn, Richard L. "Nakajima Ki-43-I Armament: A Reassessment." warbirdforum.com. Retrieved: 18 October 2009.</ref>

A Ki-43-II.

Prototypes for the Ki-43-II flew in February 1942. The Ha-25 engine was upgraded with the 2-stage supercharger, thus becoming the more powerful Nakajima Ha-115 engine, which was installed in a longer-chord cowling. The new engine turned a three-bladed propeller. The wing structure, which had suffered failures in the Ki-43-I, was strengthened and equipped with racks for drop tanks or bombs. The Ki-43-II was also fitted with a Template:Cvt armor plate for the pilot's head and back, and the aircraft's fuel tanks were coated in rubber to form a crude self-sealing tank. This was later replaced by a 3-layer rubber bladder, 8 mm core construction; with 2 mm oil-proof lamination. The bladder proved to be highly resistant against Template:Cvt bullets, but was not as effective against larger calibers.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The pilot also enjoyed a slightly taller canopy and a reflector gunsight in place of the earlier telescopic gunsight.<ref name="Peregrine p44">Template:Harvnb</ref> Nakajima commenced production of the Ki-43-II at its Ota factory in November 1942.Template:Sfn Production was also started at the Tachikawa Aircraft Company Ltd (Tachikawa Hikoki KK) and the 1st Army Air Arsenal (Tachikawa Dai-Ichi Rikugun Kokusho), also at Tachikawa. Although Tachikawa Hikoki managed to begin mass production of the Ki-43, the 1st Army Air Arsenal was less successful – hampered by a shortage of skilled workers, it was ordered to stop production after 49 Ki-43s were built.Template:Sfn Nakajima eventually ceased production in mid-1944 in favor of the Ki-84 Hayate, but the Tachikawa Hikoki continued to produce the Ki-43.<ref name="Peregrine p45">Template:Harvnb,Template:Harvnb</ref>

Tachikawa also produced the Ki-43-III, which used the more powerful Nakajima Army Type 1 Ha-115-II engine. Maximum speed increased to Template:Cvt.<ref name="Peregrine p45"/> Tachikawa produced 2,124 Ki-43-II and -III aircraft between April 1944 and the end of the war.<ref name="Peregrine p46">Template:Harvnb</ref> Total production of all versions amounted to 5,919 aircraft.Template:Sfn

Operational history

A downed Ki-43 of the 50th Sentai
Schoolgirls wave goodbye to a Ki-43 IIIa, loaded with a Template:Cvt bomb, on a kamikaze mission, 12 April 1945.

The Ki-43 was the most widely used Army fighter, and equipped 30 sentai FR (flight regiment)Template:Efn and 12 Dokuritsu Dai Shijugo Chutai ("Direct command fighter squadron" - independent squadrons not incorporated into sentais)Template:Efn. The first unit equipped with the Ki 43-I was the 59th FR at Hankow Airfield, during June–August 1941 and began operational sorties over Hengyang on 29 October 1941.<ref name="Green, p. 74"/><ref>Ikuhiko, Japanese Army Fighter Aces, 1931–45</ref>Template:Page needed The second unit to re-equip with the new Aircraft was the 64th FR, from August to November 1941.<ref>Izawa, 64th Flying Sentai, p.2</ref>

The first version, Ki-43-I, entered service in 1941, the Ki-43-II in December 1942, the Ki-43-II-Kai in June 1943, and the Ki-43-IIIa in summer 1944. The aircraft fought in China, Burma, the Malay Peninsula, New Guinea, the Philippines, South Pacific islands and the Japanese home islands.<ref name="Glancey2006p173">Template:Harvnb</ref>

Like the Zero, the Ki-43 initially enjoyed air superiority in the skies of Malaya, Dutch East Indies, Burma and New Guinea. This was partly due to the better performance of the Oscar<ref>Template:Harvnb</ref> and partly due to the relatively small numbers of combat-ready Allied fighters, mostly the Curtiss P-36 Hawk, Curtiss P-40, Brewster Buffalo, Hawker Hurricane and Curtiss-Wright CW-21 in Asia and the Pacific during the first months of the war. As the war progressed, however, the fighter suffered from the same weaknesses as the slower, fixed-gear Ki-27 "Nate" predecessor to the Oscar, and the more advanced naval A6M Zero: light armor and less-than-effective self-sealing fuel tanks, which caused high casualties in combat. Its armament of two machine guns also proved inadequate against the more heavily armored Allied aircraft. As newer Allied aircraft were introduced, such as the Republic P-47 Thunderbolt, Lockheed P-38 Lightning, North American P-51 Mustang, Vought F4U Corsair, Grumman F6F Hellcat, Yakovlev Yak-9, Yakovlev Yak-3U and late-model Supermarine Spitfire/Seafire, the Japanese were forced into a defensive war and most aircraft were flown by inexperienced pilots. However, even near the end, the Oscar's excellent maneuverability could still gain advantage over rash Allied pilots.

A captured Ki-43-IIIa of the 48th Sentai, postwar

From October to December 1944, 17 Ki-43s were shot down in air combat; their pilots claimed seven C-47s, five Consolidated B-24 Liberators, two Spitfires, two Bristol Beaufighters, two de Havilland Mosquitoes, two F4U Corsairs, two Boeing B-29 Superfortresses, one F6F Hellcat, one P-38, and one North American B-25 Mitchell.<ref>Ichimura 2009, p. 50</ref> Like most Japanese combat types, many Hayabusas were at the end expended in kamikaze strikes.

The Ki-43 also served in an air defense role over Formosa, Okinawa and the Japanese home islands. Some examples were supplied to the pro-Japanese regimes of Thailand, Manchukuo and Wang Jingwei Government as well. The Thai units sometimes fought against the USAAF in southern China.<ref>j-aircraft.com/research "Royal Thai Air Force aircraft." j-aircraft.com. Retrieved: 18 October 2009.</ref>

Hayabusas were well liked in the JAAF because of the pleasant flight characteristics and excellent maneuverability, and almost all JAAF fighter aces claimed victories with Hayabusas in some part of their career. At the end of the war, most Hayabusa units received Nakajima Ki-84 Hayate "Frank" and Kawasaki Ki-100 fighters, but some units flew the Hayabusa to the end of the war. The top-scoring Hayabusa pilot was Sergeant Satoshi Anabuki with thirty-nine confirmed victories, almost all scored with the Ki-43.

After the war, some captured examples served in limited numbers in the French Air Force in Indochina against Viet Minh rebels.<ref name="Vietnam air war p249">Template:Harvnb</ref>

Ki-43s abandoned in the Netherlands East Indies were taken over by the newly declared Indonesian government and put into service during the fight against Dutch forces.

Variants

A captured Ki-43-Ib in flight over Brisbane, 1943
Chinese operated Ki-43-I
Ki-43 at Rabaul in 1945 (later restored by the Flying Heritage Collection)
Ki-43
13 Prototypes/pre-production aircraft.<ref name="profilep3-4" >Template:Harvnb</ref>
Ki-43-Ia (kō; キ43-I甲)
Variant armed with 2 × Template:Cvt Type 89 machine guns.<ref name="profilep4">Template:Harvnb</ref><ref name="Buep6" >Template:Harvnb</ref>
Ki-43-Ib (otsu; キ43-I乙)
Variant armed with one Template:Cvt Ho-103 machine gun and 1 × Template:Cvt Type 89.<ref name="profilep4-5" >Template:Harvnb</ref><ref name="Buep6" />
Ki-43-Ic (hei, キ43-I丙)
Variant armed with 2 × Template:Cvt Ho-103, plus ability to mount 2x30kg bombs under wings.<ref name="profilep5">Template:Harvnb</ref> All earlier Ki-43-Ia "Ko" and Ki-43-Ib "Otsu" were gradually upgraded to this version as more Ho-103 became available.Template:Citation needed
Ki-43-II (キ43-II)
5 Prototypes, introduced the Ha-115 engine with two stage supercharger, shorter and stronger wings,<ref name="Nohara2000">Nohara, 2000</ref>Template:Page needed self-sealing fuel tanks, Template:Cvt of pilot armor, reflector sight, three-bladed fixed pitch propeller, and an improved canopy.<ref name="profilep5"/>
Ki-43-IIa (kō; キ43-II甲)
First Ki-43-II production model. Improvements of the 5 prototypes added into the design. Ability to carry up to Template:Cvt of bombs.<ref name="Buep10" >Template:Harvnb</ref><ref name="profilep5"/>
An improved version changed the oil ring cooler to a honeycomb type mounted under the nose, and used improved landing light.<ref name="Nohara2000" />Template:Page needed
Ki-43-IIb (otsu; キ43-II乙)
Fuel cooling system added on some examples. Both exhaust pipes were angled backwards for slightly increased thrust. Universal drop tank racks mounted outboard of landing gear on later examples.<ref name="Nohara2000" />Template:Page needed (earlier models sometimes had mounting points slightly inboard of the landing gear or on the centerline)
Ki-43-II-Kai (kai; キ43-II改)
Later examples could carry bombs on the drop tank mountings.<ref name="Nohara2000" />Template:Page needed This variant was tested with skis for operations from snow in Manchuria.<ref name="profilep8">Template:Harvnb</ref> Fitted with ejector exhaust stacks<ref name="Nohara2000" />Template:Page needed (adding approximately 30 hp) and additional Template:Convert fuel tank in fuselage.Template:Citation needed
Ki-43-III (キ43-III)
Prototypes powered by Nakajima Ha-115-II engine of 920 kW (1,230 hp) Exhaust stack configuration slightly modified. Water-methanol injection added.<ref name="Nohara2000" />Template:Page needed
Ki-43-IIIa (kō; キ43-III甲)
Only produced by Tachikawa plant.<ref name="Buep11" >Template:Harvnb</ref>
Series production model, some fitted with skis for operations from snow.Template:Citation needed
Ki-43-IIIb (otsu; キ43-III乙)
Variant with the Mitsubishi Ha-112-II radial engine and armed with twin Template:Cvt Ho-5 cannon. (Prototype – only 2 Built)<ref name="profilep6">Template:Harvnb</ref>
Ki-43-IV (キ43-IV)
Project to implement a better powerlant, never adopted.
Ki-62 (キ62)
Advanced interceptor proposed version of Nakajima Ki-43 with a more-powerful engine and armed with Template:Cvt or Template:Cvt cannons, none built
B.Kh.13
(Template:Langx) Royal Thai Air Force designation for the Ki-43-II.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

Production

Ki-43 Production: Ota, Nakajima Aircraft Company<ref name="USSBS, 1947. pp. 40–42">Template:Cite book</ref>
Year
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Annual
1941 3 9 23 5 20 20 5 29 43 157
1942 40 26 47 61 51 57 61 37 56 55 46 79 616
1943 88 77 90 96 102 105 105 120 120 138 140 147 1,347
1944 179 181 167 140 155 125 84 28 11 1,070
Total 3,190

Not included:

  • Ki-43-I's pre-production started with three prototypes completed in December 1938, as well as in February and March 1940. A further ten service trials aircraft were built from November 1939 to September 1940.Template:Sfn
  • Ki-43-II's pre-production started with five prototypes completed during February to May 1942. A further three service trials aircraft were built from June to August 1942.Template:Sfn
  • Ki-43-III's pre-production started with ten prototypes completed during May 1944 to August 1945.Template:Sfn
Ki-43 Production: Tachikawa, Tachikawa Aircraft Company Ltd<ref name="USSBS, 1947, pp. 29–30">Template:Cite book</ref>
Year
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Annual
1943 5 7 10 15 20 30 45 67 199
1944 10 115 100 140 125 147 148 157 210 75 275 180 1682
1945 105 90 155 70 120 93 80 35 748
Total 2629

A further 49 Ki-43-II's were assembled from October 1943 to November 1944 at Tachikawa Dai-Ichi Rikugun Kokusho arsenal plant.Template:Sfn

Total Production:
According to USSBS Report 5,819<ref name="USSBS, 1947. pp. 40–42"/><ref name="USSBS, 1947, pp. 29–30"/> 5,819 Ki-43-I, Ki-43-II and Ki-43-IIIa builds
According to Francillon 5,919 Template:Sfn 729 Ki-43-I, 5,188 Ki-43-II and Ki-43-IIIa builds, 2 Ki-43-IIIb prototypes

The number of Ki-43s actually delivered and accepted by August 1945 was 5,751; 3185 from Nakajima, 22 from Rikugun, and 2544 from Tachikawa.Template:Sfn

Operators

Wartime

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Postwar

Template:China as ROC
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  • Indonesian Air Force repaired derelict aircraft to fight Dutch colonial rule. In 1947, the Ki-43 currently at the Museum Dirgantara Udara Yogyakarta near Adisucipto International Airport was to bomb Dutch strategic positions however mechanical problems grounded it.
Template:PRK

Surviving aircraft

Ki-43 Hayabusa display outside Chiran Peace Museum for Kamikaze Pilots, Minamikyūshū, Kagoshima, Japan
Indonesian Ki-43-II
Ki-43 at the Pima Air and Space Museum

|CitationClass=web }}</ref> Former ZK-OSC restored to flying condition by the Alpine Fighter Collection in the 1990s, not currently flying.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

|CitationClass=web }}</ref> The nose and tail are in the main museum building, while the wings and center section are in storage.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

|CitationClass=web }}</ref> This aircraft was previously on display at the EAA AirVenture Museum and the Museum of Flight and is on loan from the National Air and Space Museum.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

  • Reproduction – Ki-43-IIIa on display at the Museum of Flight in Seattle, Washington. This aircraft contains parts from four different wrecks.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref> The restoration was begun by the Texas Airplane Factory and completed by GossHawk Unlimited.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

|CitationClass=web }}</ref> This aircraft was previously at the Tillamook Air Museum in Tillamook, Oregon.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

  • Reproduction – Ki-43 originally under restoration/rebuild at Texas Airplane Factory, Meacham Field, Fort Worth, Texas from 4 wrecks.<ref name="TAF">{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref> Now located at GossHawk Unlimited in Casa Grande, Arizona.<ref name="GHU">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

  • Reproduction – Ki-43 originally under restoration/rebuild at Texas Airplane Factory, Meacham Field, Fort Worth, Texas.<ref name="TAF" /> Now located at GossHawk Unlimited in Casa Grande, Arizona.<ref name="GHU" />
  • Reproduction – Ki-43 on display outside Chiran Peace Museum for Kamikaze Pilots, Minamikyūshū, Kagoshima, Japan.<ref>[1] kamikazeimages.net Retrieved 13 February 2018</ref><ref>Template:Cite news</ref>
  • Unknown msn – Ki-43 awaiting restoration at The Fighter Collection in Duxford, United Kingdom. The aircraft is currently undergoing restoration by Nobuo Harada and will be placed on display at the Kawaguchiko Motor Museum when completed.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

Specifications (Ki-43-IIb)

Nakajima Ki 43-I

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See also

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References

Notes

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Bibliography

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Template:Nakajima aircraft Template:Japanese Army Aircraft Designation System Template:Imperial Japanese Army aircraft names Template:Allied reporting names Template:Thai fighter designations

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