Duane,
Ray's using the correct terminology. A good model aircraft aerodynamics book will go a good deal toward explaining how these things work. Martin Simon's book will help tremendously. He discusses the proper terminology and you'll see immediately why.
An airfoil doesn't have to look like you normally expect in order to create lift and have good flying characteristics.
Check out the pictures here:
http://www.centennialofflight.gov/es...cal/Tech12.htm
http://www.nasa.gov/centers/dryden/n...-044-DFRC.html
Google for pictures of the "super-critical F-8 Crusader" to find more.
Now we aren't flying at those speeds, but the fact is, the DIFFERENCE is what makes your wing lift. The shape of the difference is what determines the lifting properties.
Andy