If you know Windows fairly well shouldn't take you long to learn a cad app for doing RC planes.

A free 2d CAD program that writes autocad DWG and DXF is A9CAD. Kinda looks like autocad as well.

http://www.a9tech.com/download/

Here's another website that has links to several Free or trail version.

http://www.machinetoolhelp.com/Softw...e-CAD_CAM.html