Stability and Control characteristics of the Early Mark Spitfires

[Crumpp]

No, there's nothing like that in the NACA reports.

Yes it is what the NACA report says.

ONLY the abrupt pull ups are stick free.

The instability in the NACA report is, that a constant stick input, say one inch back with 6lbs pressure, led to a ever increasing g-load, and that was the malus for the Spitfire controls.

Correct. The abrupt turns and all other conditions are stick fixed. The NACA did have to modify their force gauge to allow the pilot to adjust the force holding the stick fixed so as not to exceed the airframe limitations. He could move it to keep from damaging the airframe.

That is all explained in the report.