The Fw190A3 was a 420mph plane.
There are ton of differences between the Bf109E and the Bf109F... You thinking its just tailstruts pretty much says you dont really know what was done.. Lets see... Entirely new fuselage, entirely new wings, entirely new low drag radiator with boundry layer bypass, far fewer bumps and intakes, ram air for the air intake, far less drag on the fuselage, far less drag on the oil cooler, far less drag from the new flap design compared to old fabric coveed flaps of 109E, entirely new props, much cleaner landing gear instalation, retractible tailwheel, much cleaner wing due to no bumps from the wing cannon and so on and so on all working to drastically reduce drag over the Bf109E while adding significant power and the prop to transfer it into thrust and speed...
Why dont books have better data? Because most all of them draw from and repeat the same bad old research done 30 years ago - MG151 15mm cannon in the Bf109K anyone? It's basically laziness where people are simply content with putting up something like this - Bf109G speed 389mph and leaving it at that because nobody really has done the research.
