Thanks for the correction, fruitbat.
In game figures for climb for both the Fw 190 and the Spitfire are very close to real life performance. Actual test figures do not quite agree with the relative performance stated in the comparisons.
Take a fully loaded Merlin 61 Spitfire, climb it at 2850 rpm / 12 lb boost (100% power, 90% pitch iIrc) and compare it with a Fw 190A-4 fully rated at 75% fuel and 85% power. Both planes with radiators open. Historically, the British achieved a bit less than 13 m/s with the Fw 190 and a bit more than 16 m/s with the Spitfire at about 4000m altitude. Not sure how they got to "slightly better".
The 25lb boost models are conservative if anything, climb rates in excess of 25m/s in 2nd charger gear having been measured in two different tests, though I know little about the exact conditions of the test. The performance in game in accordance with a very well document RAE test. In a summary, the relative performance increase between 18 and 25 lb is stated to be 5m/s in climb, which again is pretty close to what we have in game.
G-2 and G-6 are off, though.
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