Hi Will,
Thanks for those links - both of which seem to require registration and paying a fee. I agree that English Historic Carpentry is also my usual start point for selecting an all timber scarf joint as found mainly in buildings. Unfortunately this scarf joint is unsupported and will have to generate the same load, moment and shear carrying capacity as a continuous timber, hence the already recognised need for metal reinforcement. The marriage of differing materials is not uncommon in bridge, mill and ship building (rope / timber mast joints) and, thinking aloud, I seem to recall that the TFG Lexington Bellifortis trebuchet mast was banded to help hold it together. I shall need to retrieve TF No 44 to see what clues and / or design considerations are detailed within.
The manual reference provided by Tim is excellent and its worthy of note that the engineering for this document was done by Dr. B Brungraber.
Mo,
Thank you for your contributions. I did say at the outset that this was to be a heavy duty joint and would need a bolted / banded design.
Please don't punish yourself (or me) - all will be revealed in due course when I am a little more confident (or not !) about being able to produce a workable design solution.
Regards
Ken Hume
