I also tend to think a P-51 with 6 .50 guns was far superior to anything the Germans had (discounting 262). I think (hypothetically) that P-51s, in suffient numbers, could have taken on heavies pretty well.
I would prefer the armament of the P-51D for the escort mission, where the main target would be enemy fighters, and where the well-trained American pilots were of good quality but not true experts. The experts among the Luftwaffe pilots, those who had already seen far more combat than any American pilot ever would, tended to prefer nose guns. Some variants of the BF-109, for example, appeared very lightly armed, with a pair of 7.92mm machine guns and one 20mm MG-151/20 cannon in the nose. That was fine by them. They would get close to a target, maybe 30 meters away, and shoot it in a most vulnerable spot, like a radiator. Nose armament did not have the convergence problems that wing armament had. By convergence, I mean that the wing armament of a fighter like the Mustang would be set to converge at some range, perhaps 150 yards in front of the aircraft. All the guns were aimed to come together, converge, or focus, on a single point, at that range. At ranges significantly different from that range, the guns were not converged, and were less effective. It might be very difficult to shoot another plane in the radiator at 30 yards when your wing armament is set to converge at 150. For the most part, pilots with wing armament could just shoot at enemy planes, and hope that some of the bullets would hit a vulnerable spot.
P-38 pilots knew their aircraft had problems, especially with compressibility, but they really liked their nose armament because it did not have convergence issues, and because it included a cannon.
Its also important to look at the air war over Europe in proper context. In mid 43, things were going pretty badly for the "heavies". But by 1944 and 45, the Americans were producing so many top notch aircraft, that the situation became untenable for the Germans, regardless of what they flew or how they were armed.
Agreed.
Live long and prosper.
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