PURPOSE: To make a mast and a center board supportable to the hull safely and surely by forming each support cylinder for the mast and the center board after denting or piercing through a hull wall surface consisting in a double wall structure, and attaching these support cylinders tight to the hull wall surface via a rib.
CONSTITUTION: In a plastic hull 1 of double-wall structure consisting of an upper wall surface 2 and a bottom wall surface 3, the upper wall surface 2 is dented, forming a support cylinder 4 for a mast, and the hull 1 is pierced through up and down, forming a support cylinder 5 for a center board. Then, these support cylinders 4, 5 are tightly attached to these wall surfaces 2, 3 of the hull 1 via a rib 6 and made so as to be supported thereon. With this constitution, the mast and the center board are made supportable to the hull safely and surely.
FUKUHARA NAONARI
SUZUKI SOICHI
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