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Following the Better Me-109 & Better Ki-61 threads...
I've always liked the P-39. So, what could've been done to make her a better fighter by the time WW2 began? Obviously, a better supercharger--what about turbo? More wing fuel? Fuselage fuel tank? 12x7.62mm MG in the nose (4 cowl, 4 each cheek), plus a 20mm Hisso? Tiptanks (a perennial ask of mine)? Bubble canopy?