Messerschmitt's designation Me 209 was used for two different projects during the late 1930s and early 1940s. The first was a record-setting single-engine racing aircraft for which little or no consideration was given to adaptation for combat. The second Me 209 was a proposal for a new development from the lineage that produced the highly successful Bf 109 that served as the Luftwaffe's
The K-10 was an up-gunned K-4, with the MK 108 cannon in the engine replaced by the Mk 103 and powered by the DB 605 DCM engine. The war ended before this aircraft could enter service. K-14. The final proposed version of the Bf 109. This version would have been powered by the DB 605 L engine. The DB 605 L engine was cancelled in November 1944.
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messerschmitt bf 109 engine specs