Most adhesive bonds resist tensional stress better than they do shear stress.
Skid plates on boats are subjected to considerable shear stress when the abrasion plate catches on an immovable object when the boat is in motion. This is particularly true for a plate on the stern (when the boat is moving forward). The lip at the more central edge of the stern plate tends to catch on rocks and shelves or gravelly stream bottoms as the boat moves over them. The thicker the abrasion plate and less well the edge is feathered the more likely the plate is to catch and the greater the shear stress testing the adhesive bond.
URCHIN Portable Anchor
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