Historical performance data for climb typically comes with a climb speed information. This climb speed hardly ever is constant. Often, TAS increases while IAS decreases. This has an effect on climb performance, and it is measurable. Il-2 compare does not take the planes acceleration into account, and the climb performance in Il-2 compare is a little bit higher than what is achievable in game or would be, even if perfectly modelled, with the real plane.
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