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Fighter aircraft Yak-9 Yak-9U N1157H (Yak-9UM) at Reno, USA Role Fighter National origin Manufacturer OKB Designer First flight Summer 1942 Introduction October 1942 Primary user Produced 1942–1948 Number built 16,769 Developed from The Yakovlev Yak-9 was a single- used by the in and after. Fundamentally a lighter development of the with the same armament, it arrived at the front at the end of 1942. The Yak-9 had a lowered rear fuselage decking and all-around vision canopy. Its lighter airframe gave the new fighter a flexibility that previous models had lacked.

The Yak-9 was the most mass-produced Soviet fighter of all time. It remained in production from 1942 to 1948, with 16,769 built (14,579 during the war). Towards the end of the war, the Yak-9 was the first Soviet aircraft to shoot down a jet. Following World War II, it was used by the during the. Contents • • • • • • • • • • • • • Design and development [ ] The Yak-9 represented further development of the successful fighter, a production version of the lightened Yak-7DI, taking full advantage of the combat experience with its predecessor. Greater availability of allowed for lighter construction which in turn permitted a number of modifications to the basic design.

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Yak-9 variants carried two different wings, five different engines, six different fuel tank combinations and seven types of armament configurations. Yak-9U [ ] In December 1943, it became possible to install the more powerful M-107 engine on a new airframe: the engine mounting was new with individual faired exhaust pipes; fuselage structure and wings were made of metal and the whole aircraft was covered with a skin. Fuel capacity was increased to 400 l (106 US gal). In order to re-balance the model, the wing was repositioned four inches forward and in order to improve pitch control, the horizontal tail surfaces were slightly reduced. The rear part of the canopy was lengthened and the antenna cable was moved inside it. Usual armament was a 20 mm (0.79 in) with 120 rounds firing through a hollow propeller shaft and a 12.7 mm (0.50 in) machine gun with 170 rounds.

The State trials took place from January to April 1944. They revealed a clear superiority in top speed over all other fighters in service on the Eastern front, up to 6,000 m (19,685 ft). The aircraft was simple to fly and stable. Unfortunately, the problems with the M-107A engine and all the M-105 variants from which it derived, persisted: overheating, oil leaks, loss of pressure in climbs, intense vibrations, burning-out of and a short engine life.

Despite these defects, the Yak.9U/VK-107 was ordered into production in April 1944, with 1,134 machines produced by December 1944. Operational history [ ] Second World War [ ] The first Yak-9 entered service in October 1942 and first saw combat in late 1942 during the. The versatile Yak-9 operated with a wide variety of armament for use in anti-tank, light bomber and long-range escort roles. At low altitude in which it operated predominantly, the Yak-9 was more maneuverable than its main foe, the, but was far less well armed. A series of improvements in performance and armament did not hamper the superb handling characteristics that allowed its pilots to excel at dog-fighting. Soviet pilots regarded the Yak-9's performance as on the same level as the Bf 109G and Fw 190A-3/A-4. After the, in the second half of 1943, the famed Free French unit became a Groupe and was equipped with the Yak-9.

The Klimov OKB was formed in the early 1930s to produce and improve upon the liquid-cooled Hispano-Suiza 12Y V-12 piston engine for which the USSR had acquired a license. At that time Klimov also manufactured motorcycles. In 1946 the British government allowed Rolls-Royce to sell a number of Nene and Derwent V turbojet engines.

In June 1944, at the beginning, the French Yak-9s achieved their first air victories, but suffered their first losses as well, in the region. On 15 July 1944, the Group was moved to Mikountani, in, while German armies were pushed back about 400 km (250 mi). The French pilots took their Soviet chief air crews in the fuselage of the fighters, but during the trip, Lieutenant Maurice de Seynes' Yak suffered a mechanical failure.