They are drawn along the timber and cut the timber like a plane That's why they are called a draw knife.They are razor sharp and there is no sanding afterwards
They can be made from power hacksaw blades by solver soldering a couple of bolts on the ends and slipping a file handle over the bolt and putting a nut on to finish off. The cutting edge is the same angles as a wood chisel but longer the sharper you make them the more you have to sharpen them. They also have a draw horse to hold the timber as well
Draw knives are used to make ships masts.