If the aftmost chainplate remains in the same place, how much of a difference would attaching the lower to it, instead of the upper, actually make? From the drawing it does not look like much. Most catamarans try to
work the reaching angles going downwind because it's faster than sailing deeper: enabling the boom to go further out may not improve your speed or results. Re-leading the upper shrouds so that they offer less support aft while you increase the aft load on the
mast by heading off more could be a recipe for
buying a new
mast. The load calculations that are done by the naval architect when he designs the
rigging generally determine how the shrouds and stays are set up. Before messing with them it would be a good idea to contact the
builder or
designer to get their blessing.
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