"Mihail Ivanovich Gudkov, who together with Semyon Lavochkin and Vladimir Petrovich Gorbunov had collaborated on the design of the aircraft, believed that a quick remedy to the shortcomings of the LaGG-3 was a new engine, the Shvetsov ASh-82 (also known as M-82) radial. The new unit developed more power than the Klimov M-105 in the LaGG-1/3; moreover, at the expense of a slightly higher frontal area, it enjoyed the advantage of continuing to operate in the event of one of the cylinders being shot out. On 25 August 1941, Gudkov was allocated an engine and began installation into an LaGG-3, so increasing the offensive firepower by installing 2x 12.7 mm (0.500 in) Berezin UB machine-guns and 2x 20 mm (0.787 in) ShVAK cannon. The aircraft, given the official designation Gu-82, was flown successfully on 11 September 1942, when it was found that the maximum speed, attested to 573 km/h (356 mph; 309 kn), was slightly higher than its predecessor, the agility was also significantly increased. Gudkov presented the results to Stalin and advocated the establishment of a new production line, news that was greeted with enthusiasm by the pilots who had the hope of having an aircraft more suitable to fight against the Luftwaffe. However, Lavochkin had developed another variant of the LaGG-3 with a radial engine, the Lavochkin La-5, which proved to be far superior, thus the development of the Gu-82 was cancelled." - Courtesy of Wikipedia
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