The Nakajima Ki-34 was a Japanese light transport of
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
. It was a twin-engine, low-wing
monoplane
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes.
A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...
; the
undercarriage
Undercarriage is the part of a moving vehicle that is underneath the main body of the vehicle. The term originally applied to this part of a horse-drawn carriage, and usage has since broadened to include:
*The landing gear of an aircraft.
*The ch ...
was of
tailwheel type with retractable main units. During the
Pacific War
The Pacific War, sometimes called the Asia–Pacific War, was the theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It was geographically the largest theater of the war, including the vast ...
, the
Allies
An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...
assigned the type the
reporting name Thora.
Design and development
The Ki-34 was originally designed as a civil transport. Nakajima Aircraft Company, which had the license-production rights to the
Douglas DC-2
The Douglas DC-2 is a 14-passenger, twin-engined airliner that was produced by the American company Douglas Aircraft Company starting in 1934. It competed with the Boeing 247. In 1935, Douglas produced a larger version called the DC-3, which b ...
, began design work in 1935 on a smaller twin engine
airliner
An airliner is a type of aircraft for transporting passengers and air cargo. Such aircraft are most often operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an ...
for routes which did not have the capacity to justify use of the larger DC-2. The initial design was designated AT-1, and after numerous design iterations, flew as a
prototype
A prototype is an early sample, model, or release of a product built to test a concept or process. It is a term used in a variety of contexts, including semantics, design, electronics, and Software prototyping, software programming. A prototyp ...
designated AT-2 on 12 September 1936.
The design was all metal, except for the
flight control surfaces, which were
plywood
Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. It is an engineered wood from the family of manufactured ...
. The wings used a multi-cell
cantilever
A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a canti ...
design. The prototype was fitted with
Nakajima Kotobuki 2-1
radial engine
The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ca ...
s with fixed pitch wooden
propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon ...
s, which were replaced in production models with Kotobuki-41 nine-cylinder
radial engine
The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ca ...
s, with
variable pitch
Flight dynamics in aviation and spacecraft, is the study of the performance, stability, and control of vehicles flying through the air or in outer space. It is concerned with how forces acting on the vehicle determine its velocity and attitude wi ...
metal propellers.
Operational history
Civil use (AT-2)
A total of 32 AT-2s were produced for
Imperial Japanese Airways (''Dai Nippon Koku KK'') and
Manchukuo National Airways
Manchuria Aviation Company(traditional Chinese/Kyūjitai: 滿洲航空株式會社; simplified Chinese: 满州航空株式会社; Shinjitai: 満州航空株式会社; Japanese Hepburn: ''Manshū Kōkū Kabushiki-gaisha, "MKKK"'')
was the nationa ...
,
operating on scheduled routes between
Tokyo
Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, with an estimated 37.468 ...
and
Hsinking
Changchun (, ; ), also romanized as Ch'angch'un, is the capital and largest city of Jilin Province, People's Republic of China. Lying in the center of the Songliao Plain, Changchun is administered as a , comprising 7 districts, 1 county and 3 c ...
, Tokyo and
Tianjin
Tianjin (; ; Mandarin: ), alternately romanized as Tientsin (), is a municipality and a coastal metropolis in Northern China on the shore of the Bohai Sea. It is one of the nine national central cities in Mainland China, with a total popul ...
, and within
Manchukuo
Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of (Great) Manchuria after 1934, was a puppet state of the Empire of Japan in Northeast China, Manchuria from 1932 until 1945. It was founded as a republic in 1932 afte ...
. These aircraft remained in operational service until the
surrender of Japan
The surrender of the Empire of Japan in World War II was announced by Emperor Hirohito on 15 August and formally signed on 2 September 1945, bringing the war's hostilities to a close. By the end of July 1945, the Imperial Japanese Navy ...
in August 1945.
Military history (Ki-34 and L1N1)
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With a high demand for increased
military transport capability after the start of the
Second Sino-Japanese War
The Second Sino-Japanese War (1937–1945) or War of Resistance (Chinese term) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific Th ...
in 1937, the
Imperial Japanese Army
The was the official ground-based armed force of the Empire of Japan from 1868 to 1945. It was controlled by the Imperial Japanese Army General Staff Office and the Ministry of the Army, both of which were nominally subordinate to the Emperor o ...
adapted the AT-2 design for military use by fitting with more powerful Nakajima Ha-1b radial engines and re-designating the aircraft as the Army Type 97 Transport and Ki-34. The initial 19 aircraft were produced by Nakajima Aircraft, and another 299 aircraft were subsequently produced by the Army-affiliated
Tachikawa Hikoki K.K. The final
airframe
The mechanical structure of an aircraft is known as the airframe. This structure is typically considered to include the fuselage, undercarriage, empennage and wings, and excludes the propulsion system.
Airframe design is a field of aerospa ...
was delivered in 1942.
In operational service, the Ki-34 was used as a
utility aircraft for
liaison and communications duties, and for
paratrooper training and
Special Forces
Special forces and special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equip ...
operations.
At a later date, some aircraft were transferred to the
Imperial Japanese Navy
The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...
, where they were known as the Navy Type AT-2 Transport or Nakajima L1N1. Several were also transferred to the air force of the Japanese
puppet state of China-Nanjing in 1942.
Operators
Military operators
;
China-Nanjing
*
Nanjing Air Force
;
*
Imperial Japanese Army Air Force
The Imperial Japanese Army Air Service (IJAAS) or Imperial Japanese Army Air Force (IJAAF; ja, 大日本帝國陸軍航空部隊, Dainippon Teikoku Rikugun Kōkūbutai, lit=Greater Japan Empire Army Air Corps) was the aviation force of the Im ...
*
Imperial Japanese Navy Air Service
The was the Naval aviation, air arm of the Imperial Japanese Navy (IJN). The organization was responsible for the operation of naval aircraft and the conduct of aerial warfare in the Pacific War.
The Japanese military acquired their first air ...
Civil operators
;
*
Imperial Japanese Airways (''Dai Nippon Koku KK'')
;
*
Manchukuo National Airways
Manchuria Aviation Company(traditional Chinese/Kyūjitai: 滿洲航空株式會社; simplified Chinese: 满州航空株式会社; Shinjitai: 満州航空株式会社; Japanese Hepburn: ''Manshū Kōkū Kabushiki-gaisha, "MKKK"'')
was the nationa ...
;
*
Mongolian People's Army Aviation operated more than 12 captured aircraft since in late September 1945.
Specifications (Ki-34)
Notes
Bibliography
* (new edition 1987 by Putnam Aeronautical Books, .)
*
*
External links
Warbirds Resource Group
{{Allied reporting names
Ki-34, Nakajima
Ki-34, Nakajima
Ki-034
Low-wing aircraft
Aircraft first flown in 1936
Twin piston-engined tractor aircraft