Oops, Sorry, I've been off the site for awhile. If you're a beginner, you might want to first build a kit like the Great Planes piper cub kit: http://www.greatplanes.com/airplanes/gpma0160.html
However if you want you can download the plans I drew up here. They're old and no guarantees, but free to do as you please... http://smithmodels.com/?page_id=43
Enjoy

hi there.
I'm a beginner and I want to build piper cub but i can not find the cad format of that.i'll be happy if you help me with that.