A spreader is a spar on a sailboat used to deflect the shrouds to allow them to better support the mast. Often, there are multiples, called spreaders. The spreader or spreaders serve much the same purpose as the crosstrees and tops in a traditional sailing vessel.
Spreader design and tuning can be quite complex. The spreaders may be fixed (rigid) or swinging (pivoted at the mast). The purpose of the spreaders is to control, by either limiting, or inducing, bend into the spar so that when the windward shroud is loaded the mast achieves the desired bend characteristics. The spreaders may be designed to be angled in a way that either forces bend in to the spar or reduces bend, depending on the desired results.
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