The Focke-Wulf Ta 152 is a World War II German high-altitude fighter-interceptor designed by Kurt Tank and produced by Focke-Wulf. The Ta 152 was a development of the Focke-Wulf Fw 190 aircraft. It was intended to be made in at least three versions—the Ta 152H Höhenjäger ("high-altitude fighter"); the Ta 152C designed for medium-altitude operations and ground-attack, using a Daimler-Benz DB 603 and smaller wings; and the Ta 152E fighter-reconnaissance aircraft with the engine of the H model and the wing of the C model. The first Ta 152H entered service with the Luftwaffe in January 1945. The Ta 152 was produced too late and in insufficient numbers to have a significant role in the war. The Fw 190's BMW 801 engine was originally designed for bomber and transport aircraft flying at medium altitudes in the 15,000 to 20,000 feet (4,600 to 6,100 m) range. In keeping with this role it used a relatively simple single-stage supercharger that lacked performance above 20,000 feet (6,100 m) altitude. This presented a problem for fighter use, where high-altitude performance was desirable. Through careful tuning, the Fw 190 instead emerged as a powerful medium altitude design. Several experimental models of the 190 with different engines were tested with improved high altitude performance, but these were not high priority projects. Allied heavy bombers and escort fighters began flying operations at higher altitudes, around 25,000 feet (7,600 m). At these altitudes, the 190 found itself at a disadvantage, becoming acute in early 1944 when the long range P-51 Mustang arrived in quantity. This led to the introduction of the Fw 190D-9, mounting the Junkers Jumo 213E engine. This engine had a two-stage supercharger and much better altitude performance. However, the rest of the aircraft's design, especially the relatively short wings, made it difficult to fly at high altitudes. While the D-9 upgrade was expedient, it was not ideal. High-altitude fighters Rumours of the B-29, which would cruise at altitudes at which no German aircraft could comfortably operate, added impetus for a dedicated high-altitude design. The Reichsluftfahrtministerium (German Air Ministry, or "RLM") requested proposals from both Focke-Wulf and Messerschmitt for a high-altitude interceptor. Messerschmitt answered with the Bf 109H, and Focke-Wulf entered a range of designs; the Fw 190 Raffat-1 (Ra-1) fighter would replace the existing 190D series, the Ra-2 was a dedicated high altitude fighter, and the Ra-3 was a ground-attack aircraft. These designs developed into the Fw 190 V20 (Ta 152A), V21 (Ta 152B) and V30 (Ta 152H) prototypes, all based on the 190D-9 but with varying degrees of improvement. The V20 used the same Jumo 213E engine as the Fw 190D-9, while the V21 used the DB 603E. Neither of these offered any significant improvement over the 190D-9, and further development of the Ta 152A and B was cancelled. The V21 airframe, however, was further modified as the V21/U1 and became the prototype for the Ta 152C. The Ta 152's fuselage was an extended version of the Fw 190D-9 fuselage with wider-chord fixed vertical tail surfaces (especially the top half), and hydraulic rather than electrically controlled undercarriage and flaps. Due to the changes in the center of gravity and overall balance, the nose was also lengthened.[5][page needed] The D-9 retained the 10.51 metres (34.5 ft) wingspan of the original pre-war Fw 190 models, but this was slightly extended for the C model to 11 metres (36 ft), and greatly extended for the H model to 14.44 metres (47.4 ft), which gave it much better control at high altitudes at the cost of speed at lower altitudes. Due to the war's impact on aluminium availability, the wing was built around two steel spars, the front extending from just past the landing gear attachment points, and the rear spar spanning the entire wing. The wing itself was designed with 3° of washout, from the root to the flap-aileron junction, to prevent the ailerons from stalling before the centre section of the wing. For more details of design and development, operational history and 8 variants, click here. A total of 69 Ta 152's were built.