[ACE-OF-ACES]

Has anyone bothered to log the TAS, Altitude, Throttle setting, etc in real time to a file during the CoD spitfire test flight?

And than compare that data to the real world data?

If not I would highly recommend that you do, because based on my experience most of the 'errors' people argue about are pilot errors during the test flight, not FM errors.

And the only way to be sure of that is to log said data in real time during the entire test flight, because something as simple as not holding a steady altitude during flight can have a big impact on the speed values.