Bill has it right . . . . . The shrouds and mast compression are the worry . . . On serious race boats (without a bulkhead at the mast) we had a vertical rod beside the mast and even a diagonal strut from the mast step to the shrouds to counteract the load. I can’t remember the original 35 in this regard, but we didn’t have big hydraulic backstays back then either . . . . . so I worry about the 35 . . . . On the other hand, it has survived this long . . . . so . . . . . After the new 35 (Mk III) we tabbed the bulkheads to the deck – which does the job, but before that boat production, the deck just floated above the bulkheads . . . . Rob Ball C&C 34 Escapade
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