With a top speed of 690 km/h (429 mph) at 7,400 m (24,280 ft), a powerful 2,000 horsepower Daimler-Benz 605D engine and a pressurized cabin, the K-4 ‘Kurfürst’ was the best and final version of the Bf-109 to see service. Armed with one 30-mm Mk 108 cannon and two 13...
Using MW 50 and maximum boost the Bf 109 K-4 was the fastest 109 of World War II, reaching a maximum speed of 710 km/h (440 mph) at 7,500 m (24,610 ft.) altitude. Without MW 50 and using 1.80 ATA the K-4 reached 670 km/h (416 mph) at 9,000 m (26,528 ft). The In...