FM's the State of Play with empasis on Climb performance.

[Crumpp]

The game feels right from what is in writen in pilots accounts?

No, I am saying the relative performance is correct. The specific performance is off but not outside the realm of possibility.

In fact it is a little optimistic if you are going to model the atmospheric conditions on a summer afternoon in 1940.

I am much more disturbed by such things as seeing standard data giving good agreement with a high density altitude enviroment than I am in specific cllimb performance.

See below...

If you repeat Ivank's experiment at least ten times for each aircraft, calculate the average climbing curves for each ones, then calculate the standard deviation around the average for both, use it as an error bar and show me that the bars do not superpose themselves I ll agree in the same time.

Exacty and why I said:

You can get the specific performance absolutely right within the percentage range and completely screw up the relative performance.