Numbers
Hi again,
I think you can get at least in the neighborhood with my book. Supplement with Skene's or Larsson & Eliasson. By definition, a double-spreader mast can be lighter than one with single spreaders. Run those numbers. Note that your round mast, if it is big enough fore-and-aft, will be bigger than needed laterally.
Fair leads,
Brion Toss
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