The keel, the stempost and the sternpost are the primary structures of a boat. All the stresses that the hull will endure will be applied to them, as to the keystone of an arch. Therefore, the wood to make them must be first choice quality, well seasoned: as the "old" shipwright taught us, the keel will be made of holm oak wood, stempost and sternpost of elmwood.
These three pieces will be connected through a special joint, the "incastro a PALELLA di primo ordine con tacco di forza e caviglia ferma acqua" ("first order palella joint with strenght dent and waterlock pin"). The main feature of this joint is to be able to spread all the stresses along the wood's bent, and not to load them directly to the joint parts, that could break apart. On the contrary, this way all the forces that will "attack" the boat will push the different parts against each other, keeping them joint and improving its resistance capability.
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