Focke-Wulf Ta 183

The Focke-Wulf Ta 183 Huckebein was a design for a jet-powered fighter aircraft intended as the successor to the Messerschmitt Me 262 and other day fighters in Luftwaffe service during World War II. It was developed only to the extent of wind tunnel models when the war ended, but the basic design was further developed postwar in Argentina as the FMA Pulqui II. The name Huckebein is a reference to a trouble-making raven (Hans Huckebein der Unglücksrabe) from an illustrated story by Wilhelm Busch.

Development
In early 1945, the Reichsluftfahrtministerium (RLM) became aware of Allied jet developments, and were particularly concerned that they might have to face the Gloster Meteor over the continent. In response, they instituted the Emergency Fighter Program, ending production of most bomber and multi-role aircraft in favor of fighters, especially jet fighters. Additionally, they accelerated the development of experimental designs that would guarantee a performance edge over the Allied designs, designs that would replace the first German jet fighters, the Messerschmitt Me 262 and Heinkel He 162.

The result was a series of advanced designs, some using swept wings for improved transonic performance, others instead using the tailless design to lower drag to the same end. Since German aircraft engineers were aware that tailless designs might encounter serious stability problems at transonic speeds, a variety of stabilization methods such as airbrakes on the wings were considered for such aircraft or simply adding conventional tail surfaces. Kurt Tank's design team led by Hans Multhopp designed in 1945 a fighter known as "Huckebein" (a cartoon raven that traditionally makes trouble for others), also known as Project V (Project VI in some references) or Design II at Focke-Wulf.

Design
Development of the Ta 183 started as early as 1942 as Project VI, when the engineer Hans Multhopp assembled a team to design a new fighter, based on his understanding that previous Focke-Wulf design studies for jet fighters had no chance of reaching fruition because none had the potential for transonic speeds. The aircraft was intended to use the advanced Heinkel HeS 011 turbojet, although the first prototypes were to be powered by the Junkers Jumo 004B. Early studies also included an optional 1,000 kgf (10 kN) thrust rocket engine for takeoff and combat boost, much as the special "003R" version of the BMW 003 jet engine was meant to use, with fuel and oxidiser for up to 200 seconds of burn time stored in drop tanks under the wings.

The wings were swept back at 40° and were mounted in the mid-fuselage position. The wings appear to be mounted very far forward compared with most designs, a side-effect of attempting to keep the center of pressure (CoP) of the wing as a whole as close to the middle of the fuselage as possible. Reflecting the dilemma of a shortage of strategic materials, the first option of using aluminum in the construction of the main spar consisting of two tapered I-beams attached together on the top and bottom with thin steel sheeting, led to a reappraisal. Multhopp chose to use wood instead of metal throughout the wing structure with wooden ribs were attached to the front and back of the I-beams to give the wing its overall shape, and then covered with plywood. The box-like structure contained six fuel cells, giving the aircraft a total fuel load of 1,565 l (413 US gal).

The original design used a T-tail, with a notably long vertical stabilizer and a seemingly undersized horizontal stabilizer. The vertical tail was swept back at 60°, and the horizontal tail was V-shaped and dihedralled. The horizontal surface was used only for trimming, the main pitching force being provided by the ailerons, which were well behind the center of gravity and thus could provide both pitch and roll control, functioning as elevon control surfaces, as Messerschmittt's Me 163 Komet rocket fighter already did. Many problems beset the project, including the chance of a Dutch roll. Work therefore concentrated on the much less problematical Focke-Wulf Project VII. However, when the RLM eventually rejected that design, Huckebein was again brought to the fore.

The Ta 183 had a short fuselage with the air intake passing under the cockpit and proceeding to the rear where the single engine was located. The pilot sat in a pressurized cockpit with a bubble canopy which provided excellent vision. The primary armament of the aircraft consisted of four 30 mm (1.18 in) MK 108 cannons arranged around the air intake.

It was also possible to carry a bomb load of 500 kg (1,100 lb), consisting of one SD or SC 500 bomb, one BT 200 bomb, five SD or SC bombs or a Rb 20/30 reconnaissance camera. The weapons load would be carried in the equipment space in the bottom of the fuselage and thus partially protrude about halfway from the fuselage, possibly allowing for other armament packages such as the Ruhrstahl X-4 wire-guided missile.

Multhopp's team also seriously explored a second version of the basic design, known as Design III, a modified Design II (it is unknown what Design I referred to). The first of these had only minor modifications, with slightly differently shaped wingtips and repositioning of the undercarriage. The second version had a reduced sweepback to 32°, allowing the wing and cockpit to be moved rearward. The tail was also redesigned, using a short horizontal boom to mount the control surfaces just above the line of the rear fuselage. This version looks considerably more "conventional" to the modern eye, although somewhat stubby due to the short overall length of the HeS 011.

The second of these two schemes was entered in the official competition ordered by the Oberkommando der Luftwaffe at the end of 1944. On 28 February 1945, the Luftwaffe High Command examined the various Emergency Fighter proposals and selected the Junkers EF128 to be developed and produced; the Focke-Wulf team gained second place. However, in the last few weeks of the war, it was decided that the Huckebein was really the best design and, at a meeting in Bad Eilsen, Tank was told to arrange mockups and to plan for full production. It had a planned speed of about 1,000 km/h (620 mph) at 7,000 m (22,970 ft) and it was estimated that 300 aircraft per month would be delivered when production got into its stride, each aircraft being produced in 2,500 man hours.

A total of 16 prototypes was to be built, allowing the tail unit to be interchanged between the Design II and III variations. Of the Versuchs (experimental test series) aircraft, the Ta 183 V1-V3 were to be powered by the Jumo 004B turbojet with somewhat lengthened rear fuselages to accommodate them, pending delivery of the HeS 011 jet engine. The Ta 183 V4-V14 were intended to be A-0 series pre-production aircraft and V15-V16 were to be static test aircraft. The first flight of the aircraft was projected for May 1945, but none was completed by 8 April 1945, when British troops captured the Focke-Wulf facilities.

Influence
After the end of the war, Kurt Tank, in exile in Argentina, resurrected the Ta 183 project, resulting in the IAe Pulqui II. This version was modified to place the wings at a shoulder-mounted position, in order to avoid a heavy fuselage spar pass-through structure going around the engine, however this resulted in deep stall problems at high angles of attack. This could be resolved, and a version correcting these problems was planned. However, the financial crash of 1953 and the fall of Juan Peron temporarily suspended work on the project. By 1955, the project had been abandoned due to the availability of cheap surplus ex-Korean War F-86 Sabres at a fraction of the cost.

Historians including David Myrha have claimed the Soviet Mikoyan-Gurevich MiG-15 was at least inspired by the Ta 183, because the Soviets captured plans from the Germans at the end of World War II. The MiG-15 does bear a superficial resemblance in layout, sharing the high tailplane and nose mounted intake, although the aircraft are different in structure, details, and proportions. The MiG-15's design shared features, and some appearance commonalities with the MiG design bureau's own 1945-46 attempt at a Soviet-built version of the Messerschmitt Me 263 rocket fighter, and also common to many contemporary jet fighters — and were derived from aerodynamic and structural considerations (for example, the American Republic F-84F, the Swedish SAAB 29, and the French Dassault Ouragan and Mystère). A detailed design history of the MiG-15 was published by Russian aviation historian Yefim Gordon refuting any connection between the Ta 183 and the MiG-15. According to the designers, the MiG-15 was an indigenous design, their choice of swept wings (as swept-back wings of any sort on a Soviet-designed aircraft were first flown on the MiG-8 Utka canard light aircraft) being due to their desire to move ahead of most Western designs which were not intended for the 960 km/h+ (600 mph+) speed range.

Like the MiG-9 & -15, the Saab 29 is subject to claims of having been indirectly influenced by the Ta 183. SAAB engineers received German research studies in swept wings in the immediate post-war period via contacts in Switzerland, and incorporated it into the Tunnan design, which was still limited to paper studies at the time.