Editing Heinkel He 111 (section)

===He 111 F===
The He 111 design quickly ran through a series of minor design revisions. One of the more obvious changes started with the He 111F models, which moved from the elliptical wing to one with straight leading and trailing edges, which could be manufactured more efficiently.<ref name="Regnat 2004, p. 31."/> The new design had a wing span of {{cvt|22.6|m}} and a wing area of {{cvt|87.60|m2}}.<ref name="Regnat 2004, p. 31."/>

Heinkel's industrial capacity was limited and production was delayed. Nevertheless, 24 machines of the F-1 series were exported to [[Turkey]].<ref name="Regnat 2004, p. 31."/> Another 20 of the F-2 variant were built.<ref name="Regnat 2004, p. 32.">{{harvnb|Regnat|2004|p=32}}</ref> The Turkish interest, prompted by the fact the tests of the next prototype, He 111 V8, was some way off, prompted the Ministry of Aviation to order 40 F-4s with Jumo 211 A-3 engines. These machines were built and entered service in early 1938.{{sfn|Dressel|Griehl|1994|p=34}} This fleet was used as a transport group during the [[Demyansk Pocket]] and [[Battle of Stalingrad]].<ref>{{harvnb|Janowicz|2004|p=25}}</ref> At this time, development began on the He 111J. It was powered by the DB 600 and was intended as a torpedo bomber. As a result, it lacked an internal bomb bay and carried two external torpedo racks. The Ministry of Aviation gave an order for the bomb bay to be retrofitted; this variant became known as the J-1. In all but the powerplant, it was identical to the F-4.{{sfn|Dressel|Griehl|1994|p=34}}

The final variant of the F series was the F-5, with bombsight and powerplants identical to the E-5.<ref name="Regnat 2004, p. 32."/> The F-5 was rejected as a production variant owing to the superior performance of the He 111&nbsp;P-1.<ref name="Regnat 2004, p. 32."/>