Cambered Plane Blade
The best source for this that I’ve ever seen - how to sharpen it and how to use it - is David Charlesworth. Go to Lie Nielsen’s site and buy the DVD set Hand Tool Techniques Part 1: Plane Sharpening and Hand Tool Techniques Part 2: Hand Planing by David Charlesworth.
This for me opened up a totally new perspective on using a hand plane. Things learned years ago in high school wood shop that never made sense to me now clearly do seem wrong in view of his approach.
Mark