Moreso than other knives, the handle of a chip carving knife is important. A well designed handle will assist in getting the angle of the cuts correct. The best that I have found are the "Moor" knives sold by "Chipping Away." I have the old wooden handle style. Chip carving is a whole other discipline. It can also be a bit confusing, because many Europeans call American style carving/whittling chip carving. Here is a link to some free lessons. Pay particular attention to the knives and you will see the difference.
http://www.2carve.com/chip.php