Rotational Molded Boat Hull Trenches and Plates
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Solution Overview
Problem
Rotational molded plastic-hulled power boats face challenges in running electrical cables and hoses, installing industry standard equipment, covering vent holes and loading ports, and supporting low modulus deck coverings without compromising the clean and flush appearance, as they lack accessible void spaces and complex pre-fabricated decks.
Innovation Solution
The use of strategically located and designed molded-in trench-like male cavities with corresponding cover plates that are secured flush with the surrounding plastic, allowing for the installation of cables, equipment, and support for deck coverings without disrupting the boat's layout or appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotational molding is used to construct plastic-hulled power boats, then labor savings and manufacturing efficiency are achieved, but accessible void spaces for installing cables, hoses, and equipment are lost
Solution Approach 1:
The hull is segmented into multiple molded sections with integrated void spaces distributed throughout. Rather than relying on a single large void space, the design creates multiple smaller accessible cavities within the molded structure that can accommodate cables, hoses, and equipment while maintaining the rotational molding process's efficiency.
Solution Approach 2:
Void spaces are nested within the molded hull structure itself. The cavities are integrated into the wall thickness and internal geometry of the rotational molded hull, allowing installation access without compromising the manufacturing process or requiring post-molding modifications.
2Strength
If the molded plastic shell is kept intact without cutting, then structural integrity and manufacturing simplicity are maintained, but installation of cables, hoses, and equipment becomes difficult
Solution Approach 1:
Installation pathways and access points are built into the molded hull during the rotational molding process itself. The void spaces and access features are pre-formed as integral parts of the hull geometry, allowing subsequent installation of cables and equipment without cutting or modifying the structural plastic shell.
3Ease of manufacture
If vent holes and loading ports are placed in visible areas, then functional requirements are met, but aesthetic appearance and flush continuity are compromised
Solution Approach 1:
Vent holes and loading ports are extracted from visible exterior surfaces and relocated to hidden or less prominent areas of the hull. The functional openings are positioned in locations that do not disrupt the aesthetic continuity of the molded surface, such as within structural ribs or in areas obscured by deck installations.
4Ease of manufacture
If male cavities are molded into flat horizontal surfaces, then structural features are integrated, but surface flush continuity and clean appearance are disrupted
Solution Approach 1:
Male cavities and structural features are designed with varying depths and profiles to match the specific functional requirements at each location. The cavities are shaped to accommodate their intended contents (cables, hoses, equipment) while maintaining a flush appearance when viewed from the exterior, with transitions that blend into the surrounding horizontal surfaces.
Data Source
AI summary
An article of manufacture involving a system of molded-in cavities and post-molded cover plates that solve a multitude of problems in applying rotational molding to the construction of plastic-hulled power boats. The article of manufacture includes a body, wherein the body is a plastic molded boat hull comprised of numerous molded-in cavities and molded-in features to create an interior layout that is comparable to a conventional boat built of aluminum or fiber reinforced plastic.