Monthly Archives: April 2026

Fighter, Fighterbomber, Imperial Army Air Force

Nakajima Ki-43-II-KAI Hayabusa (Peregrine Falcon, Oscar), Unit Cmdr., 11th Sentai, (Hasegawa Models)

Gallery

TYPE: Fighter, fighter bomber

ACCOMMODATION:  Pilot only

POWER PLANT: One Nakajima Ha-115 air-cooled radial piston engine, rated at 1,100 hp at 20,300 ft

PERFORMANCE: 330 mph at 13,000 ft

COMMENT: The Nakajima Ki-43 Hayabusa , formal Japanese designation Army Type 1 Fighter (Ichi-shiki sentōki) was 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. Both aircraft had generally similar layout and lines, and also used essentially the same Nakajima radial engine, with similar round cowlings and bubble canopy (the Oscar’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 A6M 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. Allied pilots often reported that the nimble Ki-43s were difficult targets but burned easily or broke apart with a few hits.
The Ki-43 Hayabusa 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. Top speed was 308 mph at 13,000 ft.
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 0.51 in 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 0.303 in bullets, but was not as effective against larger calibers. The pilot also enjoyed a slightly taller canopy and a reflector gunsight in place of the earlier telescopic gunsight.
Like the A6M 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 and partly due to the relatively small numbers of combat-ready Allied fighters, mostly the Curtiss P-36 Hawk, Curtiss P-40 Warhawk, Brewster F2A Buffalo, Hawker Hurricane and Curtis-Wright CW-21 in Asia and the Pacific during the first months of the war. 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 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.
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.
Total production amounted to 5,919 aircraft, making it the second-most produced Japanese fighter aircraft during the war after the Mitsubishi A6M Zero. Many of these were used during the last months of the war for kamikaze missions against the American fleet (Ref.: 24).

Fighter, Luftwaffe, Projects

Heinkel He P.1073.01-04, (Airmodel, Resin)

Gallery

TYPE: High Performance Fighter, Project

ACCOMMODATION:  Pilot only

POWER PLANT: Two Junkers Jumo 004B-1 turbojet engines, rated at 902,45 kp thrust each

PERFORMANCE: 628 mph (estimated)

COMMENT: The Jägernotprogramm (Emergency Fighter Program) was the program that resulted from a decision taken on July 1944 by the Luftwaffe regarding the German aircraft manufacturing companies during the last year of the Third Reich.
This project was one of the products of the latter part of 1944, when the Luftwaffe High Command saw that there was a dire need for a strong defense against Allied bombing raids. Although opposed by important figures such as Luftwaffe fighter force leader Adolf Galland, the project went ahead owing to the backing of Reichsmarschall Hermann Göring. Most of the designs of the Emergency Fighter Program never proceeded past the project stage.
In September 1944, the Volksjäger (Peoples’ Fighter) design competition was initiated to create a lightweigh high-speed fighter/interseptor using a single BMW 003 turbojet engine, and intended for rapid mass-production while made primarily of wood as metals were in very short supply and prioritised for other aircraft. The Volksjäger was intended to be disposable, with damaged aircraft being discarded rather than repaired, and was to be flown by pilots hastily trained on gliders.
A hurried design competition involving almost all German aircraft companies was started with companies such as Blohm & Voss, Fieseler, Focke-Wulf, Heinkel and Junkers.
The specification stipulated various performance requirements, including a maximum weight of 4,400 lb, a maximum speed of 470 mph at sea level, an operational endurance of at least a half hour, while the takeoff distance was to be no greater than 1,640 ft. Provisions for armour plating in areas such as the fuel tanks and around the pilot were also to be made. Furthermore, the Volksjäger needed to be easy to fly.
Immediately, Heinkel carried out some design work of a new fighter with one turbojet engine placed on top of the aircraft centered directly over the wing’s center section. Some other designs had asecond turbojet engine slung under the fuselage.
The Heinkel design team prepared several  scetches of a small aircraft with a conventional fuselage, powered by one or two turbojet engines and with different wing and tailplane configurations. One design was the He P.1073.01-04 from 10.07.1944  that finally led to the later winner of the Volksjäger competition, the Heinkel He 162 Salamander.
The He P.1073.01-04 was powered by two Junkers Jumo 004 turbojet engines, one engine mounted on top of the fuselage, the second engine was placed under the cockpit floor right to the center line. Provision was made to install the more powerful Heinkel/Hirth HeS-011 turbojet engines. The thin wings were swept back to app. 35 degree and had conventional ailerons. The turbojet exhaust would pass directly over the upper rear fuselage and the tail area. For that reason the tailplane was planned as a V- type butterfly configuration. A tricycle gear was adopted, the nose wheel was positioned asymetrically left of the center line close to the air intake for the lower turbojet engine and retracted backwards. The main wheels were retracted into the fuselage. In case of emergency the pilot could be ejected by a pneumaric driven ejection seat. Additional fuel tanks were fixed mounted close to the wing roots. The armament consisted of three 20mm MG 151/20 machnine guns.
Another design was the Heinkel He P.1073.09-44. However, both designs were not adopted by  the Luftwaffe and were not actually produced, but these sub-concepts had some influence on the final design of the Heinkel He 162 Salamander or Spatz (Sparrow) fighter aircraft that entered service in October 1944 (Ref.: 24).