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Swept back spreaders
With all due respect, swept back spreader have nothing to do with sheeting angles for a genoa. The side loads that they impart are determined to a great extent by their distance from the centerline of the boat. Swept back speaders allow the elimination of forward lowers while reducing the mast tendancy to pump by introducing a forward pressure on the mast in much the same way as forward lowers would do. They first show up in the late 1930''s on boats like the Folkboat.
Jeff
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