Aircraft performance curves

[Christer Bergström]

No, Graham, these graphs shouldn't should be completely discarded. As I said, I don't say that aircraft performance curves is totally superfluous, but it requires technical knowledge to be able to use those curves properly, and I find it surprising that no one of those who have such high thoughts about their own technical knowledge have discussed the weaknesses of these ordinary performance curves.

Also, for what do we need to know a Hs 129 ground attack aircraft's different average level flight top speeds at clinic tests at 17,000 ft, 22,000 ft, 24,000 ft, and 28,000 ft respectively?

I am always out looking for good WW II combat aircraft data, and would love to learn e.g. which is the source to the Bf 109 F-2 performance curves which Franek has access to.