I have a bit of a production line going for stringers. Three stages of production here are, cutting, gluing and "Thicknessing".
Once the scarf joints are glued I then plane the lengths down to size with a thicknesser, the planing really transforms the wood into a much nicer finish and looks great. Here is a close view of some finished stringers with a scarf joint visible on one of them.
I am about half way through making all the lengths required for the boat.
