Spit IIa

[Crumpp]

The Spitfire was at about 5 lb/g, requirements were around 8 lb/g. So it was too light on the elevator.

It would be unstable if it was <=0 lb/g. It wasn't.

That is not even close to correct. You can easily have a zero static margin for a condition of flight as the NACA determined.

Cable and hinge pressure alone can give you 5lb/G.