IIRC when introduced the G-2 made 620-630 km/h at 1.3 ata. The contemporary F-4 made about the same at the time (iirc the higher ata for the 601E was not cleared until later, but I'm not sure). When the G-6 came to widespread use 1.42 ata was cleared for use (?) meaning the G-6 could fly something between 640-650 km/h.
So effectively, progression was too slow, but the new types were not really slower than their predecessors in service. The problem was rather that handling got worse and allied fighters got faster. Though really the comparative tests held by the british on the captured G-6 with pods show for me that the G-6 could still hold up with the Spitfire. The test results are only slightly in favor of the Mk. IX, but the G-6 had the gun pods, so I assume had they used a standard G-6 both would be about on par. The real game changer were the Mustangs which were definetly a class ahead in terms of speed and at least on par in every other aspect (low speed turning aside).
BTW: The P-51 B is a bit faster than the D as well.
So effectively, progression was too slow, but the new types were not really slower than their predecessors in service. The problem was rather that handling got worse and allied fighters got faster. Though really the comparative tests held by the british on the captured G-6 with pods show for me that the G-6 could still hold up with the Spitfire. The test results are only slightly in favor of the Mk. IX, but the G-6 had the gun pods, so I assume had they used a standard G-6 both would be about on par. The real game changer were the Mustangs which were definetly a class ahead in terms of speed and at least on par in every other aspect (low speed turning aside).
BTW: The P-51 B is a bit faster than the D as well.
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