Sounds very much like what we have in game.
The main discrepancy would be the climb rate and acceleration differences between Spitfires and FW-190 models. In IL-2, it feels that the Spitfire easily climbs and accelerates better than the FW-190. That report mentions that the FW-190 is more maneuverable - except in turning circles, and that applies to both Spit Vb and IX.
However, it's hard to determine whether the FW-190 A climbs/accelerates too slowly, or if the Spitfires tend to climb/accelerate faster than they should (I am slightly inclined to the latter). The problem is that there are certain aircraft in the game that seem to climb far better than you'd expect.
Bf-109 G-2 has much better rate of climb (and maneuverability and acceleration) compared to Bf-109 G-6, and it's pretty hard to remain convinced that the aircraft's weight would have grown quite that much from G2 to G6. Anecdotal evidence from Finnish Air Force pilots would indicate that the pilots did not feel much of a difference between the G-2 and G-6, but as a matter of principle I don't really put that much trust on anecdotes. However, as much as I can try to convince myself that in reality the pilots may not have noticed that much of a difference between G-2 and G-6 because they would have flown them both fully with energy tactics... the matter of fact remains that when I fly them with energy tactics in IL-2, there's a very noticeable difference in zoom climb performance and acceleration, as well as turning performance. And I can't help but think that if I can notice the differences, surely the Finnish Air Force pilots - arguably the best trained pilots in the world flying Bf-109 G-2 and G-6 both - would have noticed and reported the differences.
Then again it's possible that they were simply referring to the fact that both aircraft were operated the same way since they shared the same engine and same general flight characteristics, I don't know. Without talking to the pilots it's hard to know what they mean by fragments of interviews sometimes taken out of context.
Moving on; Spitfire Mk.IX 25lbs versions have incredible climb and acceleration compared to Spitfire Mk.IX 18lbs versions; In fact the jump from Mk.Vb 16lbs to Mk.IX 18lbs version is about the same as jump from Spifire Mk.IX 18lbs to Mk.IX 25lbs regarding climb performance, and I'm just not quite sure that the maximum engine thrust would have increased that much. I suppose it's possible, though.
This, if anything, is something that makes me wonder about the veracity of some flight models. I doubt some things I see in the simulation, and some flight models actually have obvious errors in them (although those tend to be AI planes made flyable with mods), but typically I see exaggerated differences between planes, rather than complete reversals in performance. Gaston's argument that the FW-190 A series planes would have had better sustained turn performance than Spitfires would be a reversal of the planes' relative turn performance, while the differences between G-2 and G-6 are more of an "exaggeration" in my estimation.
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