What would anyone be laughing about, that looks pretty good to me. 8 has the RPMs right for that engine, I would tach it with the 16X8 then work from there to keep it in the RPM/Torque range. My little RCS 22cc tends to over rev with the APC 16X8 and seemed to like the APC 17X6 out of the different props I tried. When that little engine finds a new home I will be trying some of the wooden Xoars on it too. Each engine will like something a little different. Good looking plane, only a non builder would wonder about the way it looks in the bones.