The modification Bf 109F designed in spring 1940 became one of the best fighters of this period. It had considerable improvements in the aerodynamic. In June 1941 it was appeared modification Bf 109F-4 with DB 601F engine, 20mm MG 151/20 gun, better armor and other improvements. Bf 109F became the basis of the German fighter aviation during late 1941 ??“ early 9142. They took part in hard air battles from the Kola to the Crimea peninsulas.
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