I just love this plane I have built two of these Sig kits (red & white) , (blue & yellow) but wanted a bigger one for gas operation and low cost flying. So with my computer and cad software we came up with plans for one 16% larger than the original Sig kit. The Plans are for the most part just an enlargement of this popular Sig kit just bigger with a high lift performance Compufoil airfoil. They flew so well with the Ryobi 25cc with smoke I built three of them and enjoy them all very much.