https://en.wikipedia.org/wiki/Kawasaki_Ki-61
The Kawasaki Ki-61 Hien (??, "flying swallow") is a Japanese World War II
fighter aircraft used by the Imperial Japanese Army Air Service. The Japanese
Army designation was "Army Type 3 Fighter" (?????). Allied pilots initially
believed Ki-61s were Messerschmitt Bf 109s and later an Italian aircraft, which
led to the Allied reporting name of "Tony", assigned by the United States War
Department. It was the only mass-produced Japanese fighter of the war to use a
liquid-cooled inline V engine. Over 3,000 Ki-61s were produced. Initial
prototypes saw action over Yokohama during the Doolittle Raid on 18 April 1942,
and continued to fly combat missions throughout the war.
The Ki-61 was designed by Takeo Doi and his deputy Shin Owada in response to a
late 1939 tender by the Koku Hombu for two fighters, each to be built around the
Daimler-Benz DB 601Aa. Production aircraft would use a Kawasaki licensed DB 601,
known as the Ha-40, which was to be manufactured at its Akashi plant. The Ki-60
was to be a heavily armed specialised interceptor, with a high wing loading;
the Ki-61 was to be a more lightly loaded and armed general-purpose fighter,
intended to be used mainly in an offensive, air superiority role at low to
medium altitudes.
Both single-seat, single-engine fighters used the same basic construction, being
of all-metal alloys with semi-monocoque fuselages and three-spar wings, with
alloy-framed, fabric-covered ailerons, elevators and rudders. Priority was given
to the Ki-60, which first flew in April 1941, while design work on the Ki-61 did
not begin until December 1940. Although the Ki-61 was broadly similar to the
Ki-60, it featured several refinements exploiting lessons learned from the
disappointing flight characteristics of the earlier design.
During testing, the Hien proved capable, but several shortcomings were
subsequently revealed in operational service, namely the armor protection that
was insufficient against larger guns and a sub-standard engine that eventually
led to a new engine being considered.
Role
Fighter aircraft
Manufacturer
Kawasaki Kokuki Kogyo K.K.
Designer
Takeo Doi
First flight
December 1941
Introduction
1942
Retired
1945
Primary users
Imperial Japanese Army Air Service
Chinese Nationalist Air Force
People's Liberation Army Air Force
Number built
3,078
Developed into
Kawasaki Ki-100
The Ki-61 looked so different to the usual radial-engined Japanese fighters that
the Allies at first believed it to be of German or Italian origin, possibly a
license-built Messerschmitt Bf 109. The first Ki-61 seen by Allied aircrew had
been misidentified as a Bf 109 by USAAF Capt. C. Ross Greening during the
Doolittle Raid. In early reports, when it was thought to have been a German
fighter, the Ki-61 had been code-named "Mike". The final, and better known code
name adopted was "Tony", because the Ki-61 looked like an Italian aircraft.
The new Ki-61 Hien fighters entered service with a special training unit, the
23rd Chutai, and entered combat for first time in early 1943, during the New
Guinea campaign. The first Sentai (Air Group/Wing) fully equipped with the Hien
was the 68th in Wewak, New Guinea, followed by the 78th Sentai stationed at
Rabaul. Both units were sent into a difficult theatre where jungles and adverse
weather conditions, coupled with a lack of spares, quickly undermined the
efficiency of both men and machines. Because the Ki-61 was so new, and had been
rushed into service, it inevitably suffered from teething problems. Almost all
of the modern Japanese aircraft engines, especially the Ki-61's liquid-cooled
engines, suffered a disastrous series of failures and ongoing problems, which
resulted in the obsolescent Ki-43 still forming the bulk of the JAAF's fighter
capability.
Initially, this campaign went successfully for the Japanese Army Air Force
(JAAF), but when the Allies re-organized and enhanced the combat capabilities of
their air forces, they gained the upper hand against the JAAF. High non-combat
losses were also experienced by the Japanese during this campaign. For example,
while in transit between Truk and Rabaul, the 78th lost 18 of its 30 Ki-61s.
Even with these problems, there was some concern in Allied aviation circles
regarding the Hien:
The new Japanese fighter caused some pain and consternation among Allied pilots,
particularly when they found out the hard way that they could no longer go into
a dive and escape as they had from lighter Japanese fighters. ...General George
Kenney [Allied air forces commander in the Southwest Pacific] found his Curtiss
P-40s completely outclassed, and begged for more Lockheed P-38 Lightnings to
counter the threat of the new enemy fighter.
However, the increasing numerical strength of Allied bomber units, along with
inadequate anti-aircraft systems, imposed crippling losses on Japanese units.
Approximately 100 out of 130 Japanese aircraft based in the Wewak area were lost
2,000 Japanese aircraft had been lost in air attacks from up to 200 Allied
aircraft at a time, around half of which were Consolidated B-24 Liberators and
North American B-25 Mitchells armed with fragmentation bombs. After the Japanese
retreat, over 340 aircraft wrecks were later found at Hollandia.
The tactic of using aircraft to ram American Boeing B-29 Superfortresses was
first recorded in late August 1944, when B-29s from Chinese airfields attempted
to bomb the steel factories at Yawata. Sergeant Shigeo Nobe of the 4th Sentai
intentionally flew his Kawasaki Ki-45 into a B-29; debris from the explosion
severely damaged another B-29, which also went down. Other attacks of this
nature followed, as a result of which individual pilots determined it was a
practicable way of destroying B-29s.
Specifications (Ki-61-I-KAIc)
General characteristics
Crew: One
Length: 8.94 m (29 ft 4 in)
Wingspan: 12.00 m (39 ft 4 in)
Height: 3.70 m (12 ft 2 in)
Airfoil: NACA 2R 16 wing root, NACA 24009 tip
Internal fuel capacity: 550 l (121 Imp gal)
External fuel capacity: 2 x 200 l (44 Imp gal) drop tanks
Empty weight: 2,630 kg (5,800 lb)
Loaded weight: 3,470 kg (7,650 lb)
PS, 1,159 hp)
Performance
Maximum speed: 580 km/h (360 mph) at 5,000 m (16,405 ft)
Range: 580 km (360 mi)
Service ceiling: 11,600 m (38,100 ft)
Rate of climb: 15.2 m/s (2,983 ft/min)
Power/mass: 0.25 kW/kg (0.15 hp/lb)
Time to altitude: 7.0 min to 5,000 m (16,405 ft)
Armament
*
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