Quote:
Originally Posted by Fenrir
...What requirements?...
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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.
P-39 was less stable, with down to 2 lb/g at the most rearward CG allowed.