ORIGINAL: somethin else
I flew my DP ultimate with a Mejzlik 18x8 at 9300rpm on Wildcat ys 20-20 fuel. That was my favorite setup. I also ran a APC 17x6 with some pretty good performance. You just can't beat the throttle response with the Mejzlik prop though.
What engine is that? Mejzlik 18x8 @ 9300 rpm is impressive, especially on only 20/20 fuel.