Whoa
Happy New Year,
The good news is that you appear to have the technical and tool reserves that would make many riggers drool with envy. The bad news is that you appear to be attempting, as Disraeli put it, to cross a chasm in two leaps.
The question of swept spreaders involves much besides chainplates, or should; are your Genoa tracks, for instance, positioned to take advantage of the new rig? It would seem unlikely, and there wouldn't be much point in going with this rig if they weren't. So I'm inclined to agree with Robbie that the chainplate switch is more bother than it's worth.
But we've also gone right by the suitability of the new mast in terms of moments of inertia. Have you run the numbers on what the boat needs? For all we know the original mast was the wrong size, and even if it were perfect, a double-spreader mast, even deck-stepped, will want to be much lighter.
Fair leads,
Brion Toss
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