Quote:
Originally Posted by Insuber
Your first graph refers to the DB 601A, with some 100 hp less IIRC. Speed at s.l. matches the C-7 in-game, but the latter has a DB601N rated at 1200 hp. The second graph is just an estimate based on the "drag and power". It gives only 3-4 km/h more to the C-7 against the C-1/2 for 9% more power ... just 1% more speed ... not a great interpolation imho ... 
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Well it is more complicated that you think
You need to compare power curves for both 601A and 601N etc. Also i dont know what engine is used for 109 C in game. Most 110 C used Db601 engine and some used 601N but what i remember there were jabo version with bomb racks which cut some speed expecially at low alts ( with densy air). 601N had more adventage at high alts over 601A then at lower alts.