Thanks Phil, I'll look it up. I'm going to have to get TurboCAD anyway I think.
For the record, RC CAD is a pretty simple 3d visualisation tool. You enter your specs (span, taper, chord, airfoil etc and it builds up a 3d model that you can rotate and view. You can also print out line drawings and save DXFs. It seems useful, but is never going to produce anything more than the simplest working drawings. Worth dowloading the free demo for a play, but thats all.