Stuff I found.
The Bf 109 K-4 was the fastest 109 of World War II, reaching 710 km/h (440 mph) at 7,500 m (24,610 ft) altitude[101]; improved propellers were being developed when the war ended which would have boosted the speed to 727 km/h (452 mph), and 741 km/h (459 mph) was expected with an experimental swept-back propeller design.
It doesn't go like that in IL-2
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