DUDLEY DIX YACHT DESIGN

Building the DH550 Catamaran

Page 4 - Bridgedeck

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DH550 radius chine plywood catamaran

The hulls have been turned over and set up accurately level and parallel, securely supported in cradles.

The blue line on the side of the hull is a marker for the underside of the bridgedeck, used to align a rail glued to the side of the hull. The mast bulkhead is installed between the bulkhead horns projecting from the hulls. Beams are notched into the rails and span between the hulls. Plywood sheets are glued to the beams and rails, both top and bottom, to form the bridgedeck floor.

The structure must be propped from below throughout this process to keep it level and true. The props must be left in place until the bridgedeck floor is self-supporting.

DH550 radius chine plywood catamaran

The curved bridgedeck front has been laminated in place from thinner plywood, also intalled over transverse beams. The bridgedeck bulkheads have been fitted, as well as the longitudinal divisions forward of the mast bulkhead. All of the structure on top of the bridgedeck is epoxy filletted to the bridgedeck, with glass rainforcement as well to all fillets of the mast bulkhead.

DH550 radius chine plywood catamaran

Plywood brackets under bridgedeck to support splayed panel at juntion with hull.

DH550 radius chine plywood catamaran

Triangular cleats and frames glued to hull and bridgedeck to bond splayed panels. The curved portions of the cleats are formed from short lengths of timber.

DH550 radius chine plywood catamaran

The splay panels are boxed to form recesses into which the emergency escape hatches will be fitted. The pipe is a PVC drainpipe, used as a conduit for services to run inside the splay.

DH550 radius chine plywood catamaran

Aft end of the completed splay panel.

DH550 radius chine plywood catamaran

Forward end of completed splay panel. The recess for the escape hatch is visible above the drums under the bridgedeck.

DH550 radius chine plywood catamaran

Wave breakers constructed on underside of bridgedeck. These can be built on the workshop floor then glued to the bridgedeck or they can be assembled in position.

DH550 radius chine plywood catamaran

Aft bulkead being installed on top of the bridgedeck. It is scarphed to bulkhead horns (darker plywood at right in photo) that were built as part of the hull construction. The bulkhead will be filletted to the top of the bridgedeck.

DH550 radius chine plywood catamaran

Bulkheads being installed around forward cockpit.

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This page was updated 6 January 2008

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