Stability and Control characteristics of the Early Mark Spitfires

[NZtyphoon]

Originally Posted by CaptainDoggles

What is it about the tested aircraft that makes it not a representative sample of the other aircraft?

There are some awkward little phrases in the NACA test viz:



Now, until Crumpp, or anyone else, can prove beyond reasonable doubt that NACA got their cg calculations right there is a question mark over the longitudinal stability of this Spitfire VA as tested.