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IOTL Messerschmitt had to do some significant clean up of the aerodynamics of the standard issue Me-109E starting in 1939 and by November 1941 managed to issue the first of what has been called the 'best of the breed', the F-series of Me-109s that were the most aerodynamically fit version of the aircraft. This resulted in major boosts in speed, fuel consumption, and manuverability, at least some 15-20% over the previous serious. Part of this was due to the DB601E engine, but much of it was due to the cleaned up airframe and replacing the wing cannons with a single motor cannon firing through the engine itself. The first of the series didn't use the DB601E though, that wasn't ready until 1941, the Me109F1 of October 1940 used the older DB601N engines of the late Me109E marks. What if Messerschmitt got it's act together earlier and managed to produce the aerodynamically clean Me-109F1 in time for July 1940 to participate in the Battle of Britain? Let's say for the sake of argument that in July 1940 they have 1 Wing of Me-109s of the F-series with the older engine and cannon, so it doesn't have the full performance of the definitive Me-109F4 of 1941, but is still significantly better performing than the historical E-series of 1940 by 10% (range, speed, maneuverability). Furthermore let's say that they can reequip 1 full Wing per month of the battle and keep up with losses of the existing wings. What impact would that have had on the Battle of Britain? The version would effectively be significantly ahead of the Spitfire in performance (except for turning radius).

http://www.asisbiz.com/Battles/camouflage/images/Art-Messerschmitt-Bf-109F-mark-variants-01.jpg

https://en.wikipedia.org/wiki/Messerschmitt_Bf_109_variants#Bf_109F
With the early tail unit problems out of the way, pilots generally agreed that the F series was the best-handling of all the Bf 109 series.[45] Mölders flew one of the first operational Bf 109 F-1s over England from early October 1940; he may well have been credited with shooting down eight Hurricanes and four Spitfires while flying W.No 5628, Stammkennzeichen SG+GW between 11 and 29 October 1940.[46][47]

As the DB 601 E was not yet available in numbers, the pre-production F-0 (the only F variant to have a rectangular supercharger intake) and the first production series F-1/F-2 received the 1,175 PS (1,159 hp, 864 kW) DB 601N engine driving a VDM 9-11207 propeller.[36] The F-0/F-1 and F-2 only differed in their armament; the F-1 being fitted with one 20 mm MG FF/M Motorkanone firing through the engine hub, with 60 rounds. The F-1 first saw action in the Battle of Britain in October 1940 with JG 51.[48] The most experienced fighter aces, like Werner Mölders, were the first ones to fly the first Bf 109 F-1s in combat in October 1940.[46]
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