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Hello Franek
Yes the speed graphs show that P-51B was faster high up than D.
On lightweight versus heavy fighters. Yes, P-51H was in production at the end of WWII but so was P-47N, which was the equipment of four frontline FGs in Pacific when the war ended. And it was a real heavy weight. F8F was lightweight, cannot remember if the idea was to replace all F6Fs with it or not. Boeing was testflying at the end of the war a heavyweight carrier fighter (XF8B?), but I cannot remember what were the plans of the USN for it. Ah, my memory isn't working too well now. Clearly time to go to bed for me.
On P-39N/Q, yes the last P-39s (appr 2/3 of the production run) were not purely low level fighters.
Good Night
Juha
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