: I don't know what the difference is between a foiled blade or a
: regular blade or what a regular blade is in comparison. I don't
: know the advantage of one over the other. I would really like to
: know what this is all about so good thing I don't mind asking,
: does anyone have a link I could read into in order to catch up
: with my lingo and overall knowledge?

To give a practical demonstration of how much less drag a NACA foil shape has over a flat shape, I can refer you an expierence I had with one of my 23 ft racing Trailer Sailers I bought a few years ago.
The former owner/builder had done a great job on building the boat, but ran out of time when it got to the ballasted swing centreboard .
He just built a flat plywoood plate the correct thickness and profile but not aerofoiled , he just rounded the ends off.
When sailing ,we needed a rope to hold the board down there was so much drag on it.
I then aerofoiled it to a NACA shape, after that there was no need to hold it down at all with the rope and the boat speed picked up accordingly .
An aerfoiled rudder is much much more efficent as well.

Bris Paul