[ACE-OF-ACES]

Is the speed data taken from mike williams page?

No

The speed is from the real world data charts that I provided in the the pdf document (see link at bottom of first post)

If it is, his site also explains that the speed plots used are projections used by the Messerschmitt company for this aircraft.

"The following Me 109 K curves were produced by Messerschmitt's Project Bureau at Oberammergau. While the curves are rather simplistic estimates (the effect of the hydraulic coupled supercharger being absent for example), they should give some idea of potential, however, they should be treated with reserve. "

I also explaned that, where I said in my first post, and in the pdf document

[quote="Me"][i]To make maters worse, the real world data provided consists of