Jason, btw, I have the impression that the propeller goes the wrong way around. Isn't the front of the blades supposed to be the straight-edged side? To me it seems that the curved side of the prop blades is in the front here. Would surprise me if that was the case.
Freycinet, I think you're just noticing the peculiarities of design back then. Engineering incorporated as much art as science (more so in many cases) at the time, and I think a lot of aerodynamic shapes were dictated more by the designers' aesthetic sense than by any standardized scientific data.
Our DH-2 has a similar prop shape, with the leading edges showing a lot of curve. I was a bit confused at first, but spending some time observing the blades' pitch referenced to direction of rotation tells me they're going the right way. Also, the metal guards near the tips are on the leading edges.
Now, I did have a few confusing moments and heard some wires frying in my brain when I fired up the ROF UserViewer to observe the animated DH-2's blades move there...till I went back and watched them in-game: the viewer has the rotation
wrong (clockwise as viewed from the rear), and given the pitch of the blades, air should be moving
towards the nose!
In-game they move correctly (anticlockwise as viewed from the rear) though it is odd to see those curved leading edges when looking with modern eyes.
Sample vintage pic of the Eindecker looks the same as ROF's, prop spinning anticlockwise as viewed from the front, with curved leading edges.
[MF] Gunloon