Don't think you're going to get everything you need from a forum...
You are asking for alot.
ok here goes im new here. Im wanting to build a 12'x32' catamaran out of aluminum and Id like some advise.
what thickness wall and tube size should I use? not sure on strength.....
Don't think you're going to get everything you need from a forum...
You are asking for alot.
Thick enough and big enough to carry your anticipated loads. But not so big as to be too heavy.
Solved.
Next question?
Seriously, maybe you thought you were asking a simple question. You were not. A little more definition, no, a LOT more definition would be required.
Ok sorry guys. Not sure what size and thickness of square tubing to use and thickness for skin on hull. 6-8 people so like 3000 lbs max .for people and gear.
I don't think you understand that your question does not have a simple answer. The hull and associated structural members of a boat is more complicated then "xxx" thickness.
Really...
Tell me and I forget. Teach me and I remember. Involve me and I learn.