[Kwiatek]

I really doubt Kurfust that any serial 109 E could do above 500 km/h at the deck - in such case it would be equal or faster then 109 F.

Most German data for serial 109 E Db 601 A at 1.3 Ata ( 1/4 radiator open) claim 460-467 km/h ( 5-minut combat power). I think it is very beliveable result (confirmed e.x. by Swiss test and other data). Of course 109 E at 1-minut emergency power 1.4/1.45 Ata will be faster at about 15-20 km/h (with radiator closed little more).