Hi Sachs,
>D9 deck speed is off?
I wouldn't say "off". Aces High merely models a 1900 HP Fw 190D-9, not a 2100 HP one. Asking for another (perked) D-9 version instead of demanding a correction might be a better way of getting that 2100 HP Dora ;-)
>Need someone fluent in german to translate.
"Sonder-Notl. mit A-Lader als Bodenmotor" means 'special war emergency power with A-type supercharger as low-level engine'. In other words, the aircraft in question used an injection system for power boosting, the Jumo 213A-type supercharger (opposed to the different Jumo 213E-type supercharger), and the engine was specially configured for high power at low level.
If there's something interesting with regard to the 1900 HP Fw 190D-9 in this graph, it's the comment that the speeds were achieved with ETC504 bomb rack. This bomb rack did cost 10 km/h (or more) o the top speed, so if the Aces High D-9 matches the figures of curve 4, it means it flies with the bomb rack attached. A "clean" aircraft would go a bit faster, of course.
Regards,
Henning (HoHun)