The two best props for 3D on a 46 sized 2C engine are the APC 12.25x3.75 or the 11x5. The 12x7 is waaaay too much for a 46 2C engine. That is more like for a 60 sized 2C. The CAP 232 is a light plane and the 12.25x3.75 would be good stuff. You should tach at least 12,500 RPM.