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Thesecond major redesign of Bf109 is the F series. The "Friedrich" saw a complete redesign of the wings, the cooling system and fuselage aerodynamics, and was powered by the 1,175 PS DB 601N (F-1, F-2) or the 1,350 PS DB 601E (F-3, F-4). Con sidered by many as the high watermark of the Bf 109 development, the F series aband on ed the wing cannon and con centrated all armament in the forward fuselage: a pair of machine guns above and a single 15 or 20mm cannon behind the engine, the latter firing between the cylinder banks and through the propeller hub and spinner. This configuration was used by all subsequent variants. A hand ful of Bf 109Fs were used operation ally late in the Battle of Britain in 1940, but only become widespread in service in the first half of 1941, replacing the Bf109E
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