I was hoping someone could point me in the right direction in how to get some specific info on the strength of scarf joints. The material I've read is quite good at diagraming them, discussing layout, and some what on placement but they don't specify strength. For instance how much is the strenth in bending reduced, 60%, 80%, 90% of original strength. Is there a rule of thumb I can follow? I realize different scarfs have differenet characteristics but is there a way to quantify these differences? Any help or suggestion on where to look for more info would be greatly appreciated.
