I recently did some testing of some IL2 aircraft and thought I'd post it for others and see if anyone else had data to share...
I did level flight tests at maximum continuous power with boost that would not over heat the engine. I did a pull to the vertical (80-90 degrees) for a zoom climb to stall. Airspeeds are Indicated Airspeeds, not True Airspeeds.
Level @ 20k - Zoom Climb
Bf 109 G10 265 mph - to 25k
FW 190 A8 250 mph - to 24k
P 51 D 270 mph - to 25k
Spit 9e 250 mph - to 24k
La 7 3B20 285 mph - to 25k+
they all seemed to be relatively close to data I could find on the internet (wiki) except the La7 which seemed to be significantly too high.
**I just recently found this site with real test data
http://www.wwiiaircraftperformance.org/
*** here is a site if you are interested in how to calculate TAS and other stuff
http://www.scenery.org/faq_aviation.htm