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I am trying to compare speed and climb rate performance for P-39, especially for versions deployed in late 1942 and early 1943.
Greyman,
Try wwiiaircraftperformance.com. Go to P-38 and scroll to the bottom. Look on the fighter comparison chart for the P-39N. It opened my eye. Speed 397mph. and Climb 4,400fpm. Not too shabby.