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Bolt-on keels present a structural risk because they concentrate high-stress loads on a small hull surface area, particularly during groundings.2:42 While older encapsulated keels offer superior impact resistance, they can suffer from internal ballast degradation over time.5:52 Modern production boats often rely on a stringer-and-matrix system to distribute keel loads, but this internal structure can delaminate from the hull, leading to catastrophic failure where the keel rips through the bottom.2:51 ISAF data documents 72 cases of keel separation since 1984, resulting in 24 fatalities.3:58 When inspecting a used boat, surveyors should prioritize checking for rusty keel bolts, ovaled bolt holes, stress cracks in the bilge glasswork, and signs of delamination.6:52 External indicators of past grounding damage include cracks at the forward keel-to-hull joint and abrasions on the keel’s leading or trailing edges.6:57 Boats with larger keel-to-hull mating surfaces, such as the Catalina 42 Mark II, generally offer better energy distribution during impacts than high-aspect, performance-oriented keels.5:24

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