avia.wikisort.org - Aeroplane

The Nakajima Kikka (中島 橘花, "Orange Blossom") was Japan's first jet aircraft. It was developed late in World War II and the first prototype had only flown once before the end of the conflict. It was also called Kōkoku Nigō Heiki (皇国二号兵器, "Imperial Weapon No. 2").

Kikka
Role	Ground Attack Anti-ship Type of aircraft
Manufacturer	Nakajima
Designer	IJA-AS
First flight	7 August 1945
Retired	15 August 1945
Status	Prototype
Primary user	Imperial Japanese Navy
Number built	10

Design and development

After the Japanese military attaché in Germany witnessed trials of the Messerschmitt Me 262 in 1942,[1] the Imperial Japanese Navy issued a request to Nakajima to develop a similar aircraft to be used as a fast attack bomber. Among the specifications for the design were the requirements that it should be able to be built largely by unskilled labor, and that the wings should be foldable. This latter feature was to enable the aircraft to be hidden in caves and tunnels around Japan as the navy began to prepare for the defense of the home islands. Nakajima designers Kazuo Ohno and Kenichi Matsumura laid out an aircraft that bore a strong but superficial resemblance to the Me 262.[2]

The Kikka was designed in preliminary form to use the Tsu-11, a rudimentary motorjet style jet engine that was essentially a ducted fan with an afterburner. Subsequent designs were planned around the Ne-10 (TR-10) centrifugal-flow turbojet, and the Ne-12, which added a four-stage axial compressor to the front of the Ne-10. Tests of this powerplant soon revealed that it would not produce anywhere near the power required to propel the aircraft, and the project was temporarily stalled. It was then decided to produce a new axial flow turbojet based on the German BMW 003.[2]

Development of the engine was troubled, based on little more than photographs and a single cut-away drawing of the BMW 003, a suitable unit, the Ishikawajima Ne-20, was finally built in 1945. By mid-1945, the Kikka project was making progress once again and at this stage, due to the deteriorating war situation, it is possible that the Navy considered employing the Kikka as a kamikaze weapon, although this prospect was questionable due to the high cost and complexity associated with manufacturing contemporary turbojet engines. Other more economical projects designed specifically for kamikaze attacks, such as the simpler Nakajima Tōka (designed to absorb Japanese stock of obsolete engines), the pulsejet-powered Kawanishi Baika, and the better-known Yokosuka Ohka, were either underway or already in mass production.[3]

Compared to the Me 262, the Kikka airframe was noticeably smaller and more conventional in design, with straight wings (lacking the slight sweepback of the Me 262) and tail surfaces.[2] The triangular fuselage cross section characteristic of the German design was less pronounced, due to smaller fuel tanks. The main landing gear of the Kikka was taken from the A6M Zero and the nose wheel from the tail of a Yokosuka P1Y bomber.[4]

Designation

The Kikka is often identified as the Nakajima J9N1, or occasionally J9Y, which according to a researcher at the National Air and Space Museum is incorrect.[5] The official name given to the aircraft was 橘花 "Kikka." Like other Japanese aircraft intended for use in suicide missions, it received only a name. Imperial Japanese Naval aircraft were designated similar to U.S. Naval aircraft of the time frame. A first letter, denoting the role/type of aircraft, separated by a number that denotes where in the series of aircraft of the same role the aircraft resides, followed by a second letter denoting the design and manufacturing firm, and finally, a second number denoting the aircraft subtype. The first three characters remain constant through all the sub-variants an aircraft might be built to.[6]

Operational history

The first prototype commenced ground tests at the Nakajima factory on 30 June 1945. The following month it was dismantled and delivered to Kisarazu Naval Airfield where it was re-assembled and prepared for flight testing. The first flight took place on 7 August 1945 (the day after Hiroshima was bombed by atomic bomb), with Lieutenant Commander Susumu Takaoka at the controls. The aircraft performed well during a 20-minute test flight, with the only concern being the length of the takeoff run. For the second test flight, four days later (4 days prior to Japan's declaration of surrender), rocket assisted take off (RATO) units were fitted to the aircraft. The pilot had been uneasy about the angle at which the rocket tubes had been set, but with no time to correct them they decided to simply reduce the thrust of the rockets from 800 kg to only 400 kg. Four seconds into take off the RATO was actuated, immediately jolting the aircraft back onto its tail leaving the pilot with no effective tail control. After the nine-second burning time of the RATO ran out the nose came down and the nose wheel contacted the runway, resulting in a sudden deceleration, however both engines were still functioning normally. At this point the pilot opted to abort the take off, but fighting to brake the aircraft and perform a ground loop only put him in danger of running it into other installations. Eventually the aircraft ran over a drainage ditch which caught the tricycle landing gear, the aircraft continued to skid forward and stopped short of the water's edge.[7] Before it could be repaired Japan had surrendered and the war was over.

At this point, the second prototype was close to completion, and approximately 23 more airframes were under construction.[1] One of these was a two-seat trainer. Other follow-on versions proposed had included a reconnaissance aircraft, and a fighter armed with two 30 mm Type 5 cannons with 50 rounds per gun.^{[citation needed]} These were expected to be powered by more advanced developments of the Ne-20, known as Ne-20-Kai 5.59 kN (570 kgf) or Ne-130 8.826 kN (900 kgf) or Ne-230 8.679 kN (885 kgf) or Ne-330 13.043 kN (1330 kgf), which were planned to have approximately 15% to 140% better thrust than the Ne-20.

Postwar

After the war, airframes 3, 4, and 5 (and possibly other partial airframes) were brought to the U.S. for study. Today, two examples survive in the National Air and Space Museum: The first is a Kikka that was taken to the Patuxent River Naval Air Base, Maryland for analysis. This aircraft is very incomplete and is believed to have been patched together from a variety of semi-completed airframes. It is seen in the black and white photo in bare metal with two Ne-20 engines mounted under the wings. It is currently still in storage at the Paul E. Garber Preservation, Restoration and Storage Facility in Silver Hill, Maryland. The second Kikka is on display at the NASM Udvar-Hazy Center in the Mary Baker Engen Restoration Hangar. Correspondence in 2001 with Japanese propulsion specialist Kazuhiko Ishizawa theorized that Nakajima constructed the Museum’s Kikka airframe for load testing, not for flight tests. This may explain why the engine nacelles on the Museum’s Kikka airframe are too small to enclose the Ne-20 engines.[1]

Two Ne-20 jet engines had been taken to the US and sent for analysis to the Chrysler Corporation in 1946. This was only revealed in 2005 by W. I. Chapman, who was in charge of the project at the time. A working engine was assembled with the parts of the two Ne-20s, and tested for 11 hours and 46 minutes. A report was issued on 7 April 1947, titled "Japanese NE-20 turbo jet engine. Construction and performance". The document is now on display at the Tokyo National Science Museum.

Variants

Nakajima Aircraft Company developed some variants of the aircraft:

There was also a modified version of the design to be launched from a 200 m long catapult, the "Nakajima Kikka-kai Prototype Turbojet Special Attacker". This differed in having a projected total weight of 4,080 kg and a maximum speed of 687 km/h at 6,000 m.

Operators

 Japan

• Imperial Japanese Navy (Planned)

Specifications (Kikka)

Data from Japanese Aircraft of the Pacific War[8]

General characteristics

• Crew: 1
• Length: 8.125 m (26 ft 8 in)
• Wingspan: 10 m (32 ft 10 in)
• Height: 2.95 m (9 ft 8 in)
• Wing area: 13.2 m² (142 sq ft)
• Empty weight: 2,300 kg (5,071 lb)
• Gross weight: 3,500 kg (7,716 lb)
• Max takeoff weight: 4,080 kg (8,995 lb)
• Powerplant: 2 × Ishikawajima Ne-20 axial-flow turbojet engines, 4.66 kN (1,047 lbf) thrust each

Performance

• Maximum speed: 623 km/h (387 mph, 336 kn) at sea level

696 km/h (432 mph; 376 kn) at 10,000 m (32,808 ft)

• Range: 943 km (586 mi, 509 nmi)
• Service ceiling: 12,000 m (39,000 ft)
• Rate of climb: 6.42 m/s (1,264 ft/min)
• Time to altitude: 10,000 m (32,808 ft) in 26 minutes
• Wing loading: 265 kg/m² (54 lb/sq ft)
• Thrust/weight: 0.27

Armament

• Guns: 2 × 30 mm (1.181 in) Type 5 cannon
• Bombs: 1 × 500 kg (1,102 lb), or 1 × 800 kg (1,764 lb) bomb

See also

Related development

• Nakajima Ki-201

Aircraft of comparable role, configuration, and era

• Bell P-59 Airacomet
• Lockheed P-80 Shooting Star
• Gloster E.28/39
• Gloster Meteor
• Heinkel He 280
• Messerschmitt Me 262
• Mikoyan-Gurevich MiG-9
• Sukhoi Su-9 (1946)

Related lists

• List of aircraft of World War II
• List of jet aircraft of World War II

References

Notes

Bibliography

External links

• The Nakajima Kikka entry at the Hikoki: 1946 website
• Smithsonian NASM page on their Nakajima Kikka
• Nakajima Kikka – Minijets.org

На других языках

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[de] Nakajima Kikka

Die Nakajima Kikka (jap. .mw-parser-output .Hani{font-size:110%}中島 橘花, „Kikka“ zu deutsch „Orangenblüte“) war das erste Strahlflugzeug Japans. Es wurde gegen Ende des Zweiten Weltkrieges entwickelt, der Prototyp flog jedoch vor dem Kriegsende nur ein Mal. Teilweise findet man für die Kikka auch die Typenbezeichnung J9Y, es gibt aber keinen Hinweis, dass diese Bezeichnung tatsächlich offiziell vergeben wurde.

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- [en] Nakajima Kikka

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[fr] Nakajima Kikka

Le Nakajima Kikka (中島 橘花?, « Fleur d'oranger ») est le premier avion à réaction japonais.

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[it] Nakajima J9Y

Il Nakajima J9Y Kikka, (in giapponese 中島 橘花, "Fiore d'Arancio") era un bimotore a getto da caccia ad ala dritta sviluppato dall'azienda aeronautica giapponese Nakajima Hikōki KK nei primi anni quaranta.

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[ru] Nakajima Kikka

Истребитель-бомбардировщик Мандарин (Кикка)[2] ВМС Императорской Японии (яп. 戦闘爆撃機「橘花」/中島 J9N Сэнто бакугэкики Кикка)[3] — опытный турбореактивный ЛА ВМС Императорской Японии конца Второй мировой войны. Разработан в КБ Накадзима с использованием полученной от гитлеровской Германии документации по турбореактивному истребителю Мессершмит-262.

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