hello I was just planning to 'add a patio out the back' - not on land but on the yacht. I think I would need two 3m x 100mm x 100mm jarrah beams, going out astern with one-third of that length secured by bolting to the deck
. then I would lay some timber 'decking'. at sea I would put the tender
on it, using the platform in place of davits
, and at anchor
it would be a nice bbq area.
oh, how to support it?
- I currently have twin mizzen masthead running backstays
which attach to the aft deck
. I would replace them with twin standing backstays
which would transit the far ends of the beams, finalising at the bottom of the transom.
question: what is the load bearing capacity of a beam of those dimensions (weight of dinghy
and the structure itself). and what is the compressional/torsional strenght, exerted by the new standing backstays
? and how to calculate?
i have searched everywhere for some basic data sheets
- does anyone know of any? in desperation I have 're - soughted' to steel
beam data, with equally little success. surely the math can't be that arcane? i have yet to find any simple data sheet or 'physics for dummies book'. any website or similar source would be welcome!.