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A sailmaker at Boston Doyle identified a mystery Genoa brought in for assessment as the original headsail built for the boat Lady K — ordered in 1979 and delivered in 1980, making it 46 years old.▶ 2:55 The discovery came when the sailmaker cross-referenced a handwritten ledger and matched the order to the same surname as the boat's original owner.▶ 2:55 The mainsail, a full-batten double-reef cruising Dacron, was assessed as repairable and worth reinforcing for a few more years rather than replacing.▶ 1:42 The transcript breaks down sail longevity by material and UV exposure. Cruising Dacron — woven polyester — typically delivers 10–15 years of performance life before stretch moves the draft aft and degrades pointing ability, but structural life can exceed 30 years.▶ 4:44 Laminate sails (Kevlar, Carbon, Technora, Dyneema constructions) hold shape longer but delaminate and fail structurally in 5–7 years for cruising use, 3–4 for racing.▶ 5:53 UV radiation is identified as the primary killer of all sailcloth, degrading fibers, stitching, and adhesives.▶ 6:27 The 46-year-old Genoa survived because it was built from heavy cruising cloth, carried a large UV cover when furled, and spent winters stored indoors on the Great Lakes.▶ 7:12 Performance life and structural life are distinct: a sail can remain intact long after it stops sailing efficiently.▶ 7:41

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