Molded boat hull with integrally contained areas of localized reinforcement

In an integrally moulded plastic boat hull structure, comprising:

• opposed inner and outer shells which are integrally joined around peripheral portions thereof and which are also integrally joined at adjacent regions within said periphery by interior stiffening means including a plurality of spaced stiffening members integrally joined to and extending between said inner shell and outer shell, to form an integral unitary hull with hollow areas between said inner and outer shells, bounded by said spaced stiffening members;
• each of said shells including interior and exterior surfaces;
• a plurality of fastening locations for securing associated components to at least one of said shells;
• at least some of said fastening locations including a threaded insert integrally moulded into the plastic material of at least one of said shells, and including a threaded opening at the exterior surface of said shell;
• a planar force dissipating member integrally moulded into, and located between the interior and exterior surfaces of said shell at said fastening location;
• said threaded insert extending through an opening in said force dissipating member and secured thereto;
• such that localized forces developed at said fastening location are transferred away from the moulded shell attachment of said threaded insert to its immediately surrounding plastic material, to create an enlarged force dissipation region within said shell.