Don't make performances secret this time

[Rama]

Originally Posted by zapatista

in the 50 yrs since ww2 these historical aircraft performances have been analyzed, compared, and even new performance tests have been made with historical aircraft or reproductions built.

Mmmm... I know many warbirds type from which you can't find a consensual flight test datas analyses...

the same problem of, "what data can you trust", exists in every scientific discipline, and there is fairly simple ways to cut through the accumulated evidence in an objective way and source some "close to accurate" numbers, these SHOULD then be reproducible .../...

... or better... correct the data so to fit the model, like in GW models for examples... then for sure, datas aren't a problem any more...

I totally disagree with you
The hardest part is to compare, analyse the data and to select the right set... or to create a trustable set from different ones.... there are no "simple ways". Data selection fuels among the hardest disputes between scientists.
Adjusting the model to fit the choosen data set is the easiest part... as John von Neumann said: "With four parameters I can fit an elephant and with five I can make him wiggle his trunk".