Fiberglass Boat Strength

Several years ago I heard a story about a boatbuilder who was demonstrating the toughness of their hull at a boat show booth by allowing passersby to wack a hammer at a sample fiberglass sandwich core panel. Each time, the hammer would impressively bounce back, leaving only a small dent. But then one dubious volunteer (an engineer, one presumes) took a turn, but this time with the hammer claw at the business end. The claw quickly pierced the thin laminate and lodged in the core, thus puncturing the myth of the indestructible hull.
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