History
The Lavochkin La-7 was a logical development of the highly successful radial engine fighter, the La-5, which was itself an improved LaGG-3 all wood fighter which, while having reasonable performance, was not satisfactory as a first line fighter at the beginning of the “Great Patriotic War”, as the Russians designated World War II. While the LA-5 went through numerous changes during its production life, it became obvious that the 1820 hp. Ash-82FN radial engine had reached its development peak, and that there was no suitable replacement for this engine, as the Ash-71F radial of 2200 hp. was unreliable and unsuitable for service use. Therefore, the Lavochkin Design Bureau decided to upgrade the basic La-5 design, making aerodynamic refinements on a prototype designated La-5 (206) which included a new cowling, oil cooler location, supercharger intake, exhaust cover outlet, and radio mast shape.