Isn't the instability the fact that the Spitfire tightens its turn by itself without further control input???
The pilot has to stabilize the plane by countersteering.
Like a rear wheel driven car in a power slide around a turn, working, but stable is different.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects
 
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