Indeed Mau but were they the standard props or different ones ? - and if you think I'm chasing that down you can think again - your English is fine so over to you mate, feel free to jump into the morass any time you like !
The prop used on the D.Va D7117/17 fitted with the BMWIIIa engine was an Axial airscrew of 2.9m (9'6 1/2") diameter, 1.9m (6'2 7/8") pitch - it was piloted by BMW's test pilot Franz Zeno Diemer at a loaded weight of 872.8Kg (1,920 lb). The fact the airscrew was even mentioned suggests it was not standard to an Alb D.Va.
Other things to take into consideration would be the difference in the gap between the wings, no fairing at the wing root and the fully eliptical fuselage cross section - maybe being squarer as the Alb D.III was provided some lift.
So no, as we said earlier, it's not just about the engine but having a decent one helps, as does the package around it. Just ask McLaren in F.1 !
And you're not wrong Tim !
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