Kawasaki Ki-45
| Industry | Aerospace, Defense |
|---|---|
| Founded | 1937 |
| Products | Aircraft (including Kawasaki Ki-45) |
The Kawasaki Ki-45 was a twin-engine, two-seat heavy fighter utilized by the Imperial Japanese Army throughout World War II. While the army designated it as Ki-45, Allied forces referred to it by the codename "Nick". Originally conceived as a long-range escort-fighter, it struggled against more nimble, single-engine adversaries. As a result, its primary role shifted to that of a day and night interceptor and strike fighter.
Design and development
In response to the emergence of European twin-engine heavy fighter designs such as the Messerschmitt Bf 110, the army commissioned Kawasaki Shipbuilding in 1937 to create a twin-engine, two-seat fighter initially called Ki-38. This effort only advanced to the mock-up phase; however, by December 1937, development of the Ki-45 prototype was authorized, which took flight for the first time in January 1939. Early evaluations revealed that the original Ha-20 Otsu engines were underpowered and unreliable, alongside aerodynamic stall problems with the airframe.[1]
Despite these challenges, the army continued development, leading Kawasaki to substitute the engines with more dependable Nakajima Ha-25 powerplants. Subsequent flight tests demonstrated enhanced performance.[2]
By October 1940, further improvements included installation of Mitsubishi Ha-102 engines. This upgraded model, known as the Ki-45 Kai, was finalized in September 1941 and officially accepted into service in February 1942 under the designation "Type 2 two-seat fighter".
A single-seat prototype variant named Ki-45 II served as a foundation for the later development of the Ki-96.
Operational history
Initially deployed in mid-1942 as a long-range escort for bombers, the Ki-45 entered combat with the 84th Independent Flight Wing during operations over Guilin, where it encountered Curtiss P-40 fighters operated by the Flying Tigers. Its performance against single-engine fighters proved insufficient, a shortcoming further confirmed during missions over Hanoi later that year. Consequently, its role shifted toward interception duties, ground and naval attack missions, and fleet defense. The aircraft excelled particularly in anti-bomber interception roles, comparable to the Bf 110’s function in Europe. In campaigns over New Guinea, heavily armed Ki-45s were equipped with one and two cannons along with two bombs mounted on wing hardpoints. Throughout the conflict, approximately 1,675 units were manufactured.
The initial production version (Ko) was armed with two Ho-103 machine guns mounted in the nose, a Type 97 cannon offset beneath the fuselage, and a flexible rear machine gun operated by an observer. The Otsu model replaced the lower cannon with a Type 94 tank gun intended to engage B-17 Flying Fortress bombers; however, this weapon’s manual reloading mechanism limited sustained firing capability. The Hei variant reinstated the cannon and added an automatic gun in the nose section. The Tei type introduced dual obliquely-firing Ho-5 cannons positioned behind the cockpit and commonly featured exhaust stacks designed for thrust augmentation.
Shortly after entering service, several Ki-45s were assigned to homeland defense and deployed against the Doolittle raid, although they did not engage enemy aircraft during that operation. Its formidable armament proved effective against B-29 Superfortress bombing raids commencing in June 1944; nevertheless, its performance was inadequate at intercepting B-29s operating at high altitudes. Efforts to enhance capabilities by reducing fuel load and ordnance yielded limited results; ultimately, some Ki-45s resorted to aerial ramming tactics.
Ki-45s also took part in kamikaze attacks, notably striking on April 2, 1945, off Okinawa—inflicting severe damage that led to the vessel’s eventual scuttling after uncontrollable fires erupted.
In 1945, upward-firing armaments demonstrated effectiveness during nocturnal bombing assaults despite lacking radar systems. The arrival of American carrier-based fighters alongside P-51 Mustang and P-47 Thunderbolt escorts operating from Iwo Jima effectively ended frontline deployment of the Ki-45.
The Kawasaki Ki-45 Kai D, developed as a night fighter variant equipped with planned centimetric radar that never materialized due to production difficulties, remained operational within four sentais from late 1944 until war’s conclusion. These units recorded significant achievements including one squadron claiming approximately 150 victories and shooting down eight USAAF B-29 bombers during their initial combat engagements.
Although intended for replacement by the Kawasaki Ki-102 in ground attack roles, the Ki-45 continued active service until Japan’s surrender.
Following hostilities, three Ki-45 aircraft captured by communist Chinese forces were utilized in combat sorties with their Combat Flying Group’s 1st Squadron from March 1949 until their retirement in the early 1950s.
Variants
There is often misunderstanding about the different Ki-45 submodels; this overview adheres to Japanese classifications rather than Western interpretations. For example, the National Air and Space Museum (NASM) categorizes the exhibited Ki-45 as a hei (c) variant, whereas Japanese publications identify it as a tei (d) night fighter equipped with dorsal weaponry.
- Ki-45
- Initial prototype aircraft
- Ki-45 Type 1
- Operational models with modifications
- Ki-45 Kai
- Prototype and limited pre-production versions
- Ki-45 Kai A (kō/甲)
- The first two-seat Type 2 fighter featuring a single Ho-3 cannon mounted under the fuselage, two Ho-103 machine guns in the nose, and one flexible rear gun
- Ki-45 Kai B (otsu/乙)
- An upgrade of Kai A where the belly cannon was replaced by a 37 mm Type 94 cannon
- Ki-45 Kai C (hei/丙)
- Naval adaptation armed with a Ho-203 automatic cannon in the nose and a single rear machine gun
- Ki-45 Kai D (tei/丁)
- Night fighter variant derived from Kai B, outfitted with one Ho-203 cannon nose gun, two fixed Ho-5 cannon mounted dorsally in Schräge Musik configuration, plus a Type 98 rear machine gun
- Ki-45 II
- Prototype for a single-seat fighter later redesignated as the Ki-96
Production total: Estimated between 1,691 and 1,701 units.
Operators
- Imperial Japanese Army Air Force
- No. 25 Dokuritsu Hikō Chutai
- No. 71 Dokuritsu Hikō Chutai
- No. 84 Dokuritsu Hikō Chutai
- No. 4 Hikō Sentai
- No. 5 Hikō Sentai
- No. 13 Hikō Sentai
- No. 16 Hikō Sentai
- No. 21 Hikō Sentai
- No. 27 Hikō Sentai
- No. 45 Hikō Sentai
- No. 53 Hikō Sentai
- No. 65 Hikō Sentai
- No. 70 Hikō Sentai
- Akeno Army Fighter Training School
Surviving aircraft
Presently, only a single Ki-45 Kai C remains intact. This aircraft was among roughly 145 Japanese planes transported to the United States on board the USS Barnes for postwar evaluation. Following refurbishment at the Middletown Air Depot, Pennsylvania, it underwent test flights at both Wright Field, Ohio, and Naval Air Station Anacostia in Washington, D.C.. In June 1946, the United States Army Air Forces gifted this Toryū to the Smithsonian Institution. The fuselage is exhibited at the Steven F. Udvar-Hazy Center, displayed alongside other Japanese aircraft such as the Nakajima J1N, Kyushu J7W Shinden, and Aichi M6A. The remaining components are preserved at the Paul E. Garber Preservation, Restoration, and Storage Facility.
References
- Notes
- Bibliography
- "Army Type 2 two-seat fighter Toryu". Famous Airplanes of the World #21. Tokyo: Bunrindo, 1990. .
- (new edition 1987 by Putnam Aeronautical Books, .)
External links
- ↑ Francillon 1979, pp. 94–95.
- ↑ Francillon 1979, p. 96.