Prop for the YS 63
I use an APC 13x6 or Graupner 12.5x6W on mine. 13x6 is better for pattern, but the wide is better for 3d... i'd take the 13x6 out of though.
I'm gonna geta 14x4... this is from what i hear the optimum 3D prop.. not sure why yours has come out the way it did... ill keep you posted.