Block Construction of Small Ships and Boats Through Use of Developable Panels*

Abstract

The authors propose a simple method to improve productivity for construction and subsequent outfitting of typical hard-chine boats. This method uses CAD/CAM definition of the structure to manufacture the bottom and sides, decks and bulkheads of the boat as independent panels. The system divides such craft into construction modules by surfaces instead of by blocks as in standard shipbuilding practice. Since all of these panels are developable, an adjustable jigging system supports them essentially horizontally on their rulings. Transverse stiffeners are then welded to the panels. The system and details are optimized for maximum use of downhand welding and weld pacers. This system, however, requires specialized software to develop piece parts and to efficiently derive these modules from the product model. The developable panels can be outfitted with machinery, foundations, piping, wiring and insulation. Bottom and side panels can be tipped up, joined and more outfit installed in stages optimized for lifting and ready access. The deck is built and outfitted inverted, and then joined to the open hull. The bulkhead details and deck framing are also optimized to allow ready outfitting and subsequent joining of the deck as a unit. The easy access to the panels also allows effective, low-cost surface preparation and painting, so this system has benefits for both steel and aluminum construction.