Sparky,
So your not using any predetermined airfoils like a NACA number or anything? I've also just drawn up my own airfoils before using similar methods. but I figured you probably had a bit more scientific way of design, not that it's really necessary.
So then, what is your opinion on the many different radiuses you could end up with using the french curve or hand drawn methods?
On another note, something I started doing a few years ago is tracing out a root rib outline onto a piece of card stock, cutting it out and saving it, for every model I build. Very soon you end up with a nice inventory of different usable airfoils and it is quite interesting to compare them to each other, epecially when designing that "next' project.