When I'm making curved knee braces for our frames, rather than cut curves out of straight material, I procure trees that have grown with curves already in them. This means, first of all, that there is no short grain runout, which makes the brace stronger, and secondly it means that each knee brace is bespoke — original; beautiful.
Finding this material takes a great amount of knowledge, time and energy, and above all a developed artistic eye. The artistic eye begins in the forest, in the tree selection itself, and ends in your home.
I air dry our brace stock to insure dimensional stability. The result is a stronger and much lovelier knee brace that is completely unique to your project.