We race the WM T-34 out here with the OS 46AX. A good prop for this combination is the APC 9.5x6. I would think that the Sundowner would have a similar drag profile.
ORIGINAL: deadheaddave
well, tried the 12x6 and was working my way down, got out to the field late so only got to the 10x8. Iknow I already ran this prop but I figured I would try them all at the same time. But anyway the 10x8 was by far the fastest of the two. The 12x6 had a lot more power on the take off but not enough in the air to keep the plane moving the way I wanted it to. So I'll try the 10x7 and 6 hopefully tomorrow, you guys are probably on the money with this. let you know how it goes.