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Actually the Stuka had an automatic pull-up system. The pilot would set the mission parameters into it and put the plane into the dive. It would be pulled out of the dive automatically. Kind of like a very specialised autopilot
P-51 as a tank killer? Not with that liquid-cooled Merlin. "Stick a hat-pin in the belly of a P-51 and it will bleed to death in 30 secs." Not a good characteritic for shooting up ground targets.