Regarding the speed figures from ww2aircraftperformance. You'll see the effect of the engine gap. This was not sealed in real life. In performance calculations it was assumed sealed, because the model wasn't exact enough. So tests with gap sealed as well as Fw performance calculation show higher speeds than were attainable with the real D-9. So for reasonable real life performance, take the green line (Fw Flugmechanik, 15.12.44), and subtract 10-15 km/h for the effect of the engine gap.
3250 rpm were allowed for 30 mins max., unless the engine exceeded temperature limits.
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