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I want to change my mast base. At the moment the mast stands on the foredeck. Now i want to change the mast base to a carbontube, but I am not sure how strong it should be. Will a 60x56mm Carbontube will be strong enough? What diameter do you use?
You mean as a post up to gooseneck height? I have to admit that I just wildly overbuilt mine: the engineering was above my capabilities... I started with a piece of standard mast section, which ran right down the bulkheads to the keel, and added a lot of unidirectional carbon to the part that was going to be above the bulkheads - probably between 4mm or 5mm thick total at a guess, and then tapered that off down to nothing after about 300mm. That was quite a short stump though. On another boat, not an IC, which needed a longer stump I started with the bottom of a broken carbon Finn mast and beefed that up a bit above deck level.