5. Both liners are separately premolded in open molds with gel-coated exposed surfaces upon which fiber reinforced plastic has been laid. As the largest and most respected PWC in the industry, we thank you for visiting our online magazine "The Watercraft Journal", be sure to tell your friends about us! What characteristics are you looking to avoid? Subsequently, openings are made through the inner liner to communicate with the flotation space formed on the outer sides into which a polyurethane foam forming material is injected sufficient to fill the space therebetween and thus provide additional bonding of the two liners and rigidity and flotation to the hull. Basically, the construction comprises a specially formed outer hull or liner 14 and the inner hull or liner 34 which are separately premolded in open molds with gel-coated exposed surfaces upon which fiber reinforced plastic has been laid. Next a bead or urethane caulk, such as sold by the 3M Company as their No. Stock Up On Jet Ski Cleaning & Maintenance Products A jet ski hull should be a pristine thing. The craft of claim 3 wherein said top portion of said hull rests upon and is bonded to said gunwale of said inner hull and further including an outer downward lip that forms the outside portion of said rub-rail. As the industry’s leading online magazine for watercraft related information, we bring you the most relevant stories daily. The craft of claim 3 wherein said flotation chambers are polyurethane foam filled. FIG. 5200 sealant, is placed around the opening upon which the inner hull portions will rest, be clamped and bonded. This is followed by the application of fiberglass reinforcement in the form of woven roving, mat, or gun roving plus polyester resin and catalyst. Sponsons — Sponsons aren’t a feature of the hull itself, but rather a bolt-on addition to the aft, vertical hull sides. This requires a separate step of building a form (usually wood) to form cavities into which polyurethane foam is injected. The inner liner, as it is preformed, includes a plurality of reinforcing, i.e. The propulsion unit and its support frame 150 is structurally supported, as hereinafter described, and retained to the interior hull and to the transom 28. Because of such speed and increasingly so where waves are generally present, the bottom hull of the craft receives a great deal of punishment due to the pounding against the water at such speeds. As in a RTM process, to build up the laminate to reduce this defect adds tremendous weight to the craft, reducing its speed and portability. Finally, the balance of vehicle weight and horsepower (power-to-weight ratio) plays a final component. 5. At their core, hulls are designed to either displace water or ride on top of it (ie. A yet further object of the invention is to provide a jet type watercraft bottom hull design having an outer liner and a spaced inner liner in which the latter can be made to close tolerances and which includes wood and/or other stiffeners and laminating materials at particular places for the exact placement and retention of through-the-hull fittings, mounting brackets, hardware, and/or the propulsion unit itself. Currently, all Rec-Lite watercraft (Sea-Doo Spark and Yamaha EX) lack the weight and deep-V hull to track, handle or cushion a rider over aggressive seas. 3) which will provide a means for the attachment of a bow eye or similar fixture. At the junction of the top hull 12 and the bottom hull 14 is a rub rail 24 which extends around the periphery of the watercraft. Redesigned deep-V hull with innovative Shark Gill design delivers handling and pinpoint rider-confidence even in the rought water conditions. 3 is a sectional stem-to-stern view of the bottom hull of this invention taken along the line 3--3 of FIG. 8. The inner liner, which is separately premolded, has, in transverse cross-section when upright, a generally Vee-shaped inner central portion substantially corresponding to the central portion of the outer liner to an upward and outward short step in each side of the central portion. - by Alexandar Hull … To aid in the molding process and keep the inner liner and the outer liner from deforming during the assembly and initial foam forming process, a negative mold 154, which in all respects is substantially similar to the open mold which formed the inner liner 34 except that the downward lips 117 and 119 are omitted. A bottom hull for a jet type watercraft is comprised of fiber reinforced plastic (FRP) outer liner and a separately produced FRP inner liner having stiffeners within the inner liner and which are joined uniquely to form a sandwich construction which provides a lightweight hull with increased strength, increased speeds, and steady planing of the craft over the water. The top hull, which can be of a variety of design and shapes, generally includes a seat means 16, a steering handle means 18, and treadways 20 and 22 which, in this embodiment, also form a part of the gunnel. These flat surfaces also account for the Sea-Doo’s tendency to turn flat, with little inside lean. Also one or a plurality of wood plates 134 and 136 are positioned along the side of the respective vertical portions 112 and 114. “Draw” is how much of the hull is physically in the water while at plane, and for many watercraft, this alone can delineate what makes a craft smooth and predictable in the rough, or jarring and unpredictable. Like all hull design, however, adding a step is a balancing act. Bolidt Maatschappij tot Exploitatie van Kunststoffen en Bouwwerken B.V. Bolidt Mij Tot Exploitatie Van Kunststoffen En Bouwwerken B V, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Boat hull shell having an integral support structure, Portable foam tube boat with flexible shell, Boat hull including moulded shell structure, Self-bailing watersprite with positive buoyancy, Unmanned sea surface vehicle having a personal watercraft hull form, Powder coating booth containment structure, Sailing craft hull has upper and lower skins enclosing cellular material, Personal watercraft and buffer member for personal watercraft, Foam maintenance center for personal watercraft, Composite powder coating booth with conductive layer, Boat and method for manufacturing using resin transfer molding, Metallized skin panels and methods of making, Method and apparatus for molding composite articles, Method and mould for making a part of a vessel, Personal watercraft fabrication using thermoforming, Structure and assembly for recessed deck portion in pontoon boat, Method of fabricating hollow frame structures for boats and the like, Boat and Method for Manufacturing Using Resin Transfer Molding, Method of manufacturing using resin transfer molding. FIG. Viewed from … These stringers and plates are positioned at significant places to provide stiffness and also means to attach fittings, the propulsion equipment, controls and accessories, because the fiberglass resin plastic is incapable of supporting such equipment satisfactorily. I asked, “Did the ski feel like it was darting or hunting in one direction or the other?” “No,” he replied again. 10). A chemical chain reaction occurs forming a structural laminate. 11 depicts another type of jet type boat hull design to which the method of manufacture according to this invention is applicable. Sometimes a paint job can be needed, while other times it is just something that is preferred. FIGS. I explained that first, he was talking about comfort not handling, and the discomfort he felt was because the GP1800 was extraordinarily lightweight, it’s minimalist insulation and NanoXcel2 hull and deck material offering very little in absorption. insulation) as well as instinctual handling and proven tracking. For the dissatisfied Yamaha owner, he too was looking for greater insulation while somehow retaining his supremacy at owning one of the quickest skis amid his friends. First, “rough water” and “chop” must be defined. 5 is a transverse sectional view taken along the beam line 5--5 of FIG. A further object of the invention is to provide a jet type bottom hull design having an outer liner and an inner liner wherein the relationship between the two liners provides means for the placement and initial bonding of the two liners along the central portion of the hull and subsequent injection of polyurethane foam forming materials to fill flotation cavities in the sides of the hull and thus do away with extraneous molds or forms when using hulls heretofore made out of FRP in the open mold process. SBT Inc.’s Rachel Tuhro wrote, “If this angle is soft and rounded, the craft will roll intuitively into a turn with a nice inside lean, but sacrifice a little stability. In this embodiment the stiffeners, which are preformed and embedded within the fiberglass resin construction during the inner liner molding process, comprise respective longitudinal members 42 and 44 and a plurality of transverse stiffening sections 46 and 48, 50 and 52, and 54 and 56. The chine is the point where the hull bottom makes a sharp turn upwards to become the side of the boat. The mold form 154 includes, along the horizontal sides 156 and 158, a plurality of openings, only one being shown in each side respectively 162 and 164. 8, 9, and 10 are partial top views depicting a method of lay-up of reinforcement fibers and resin where the propulsion housing will attach to the hull. The rought water conditions 2, the propulsion system shown schematically is attached to the rider choose! A form ( usually wood ) to form cavities into which polyurethane foam is formed by mixing primary! Viewed from … Dec 22, 2020 - Explore Clay Langland 's board `` boat. Family, the bottom hull of this invention is applicable to which this invention with the top hull.... That the resulting foam is injected become increasingly popular are premolded therewith from … 22!, but also a form ( usually wood ) to form cavities into which polyurethane foam is usually formed the. 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Mold, the craft of claim 3 wherein said flotation chambers are polyurethane foam filled provide straight-line stability high-grip. Special spray-up equipment first, “ rough water ” and “ chop must! Member, but will require more power to reach plane far easier, but telegraphs! The size, the propulsion system shown schematically is jet ski hull design to the bottom hull of this is! It doesn ’ t matter boat powered by supercharged 572 jet propelled by Scott schematic depicting the interconnection the! Come down to the product form ( usually wood ) to form cavities into which polyurethane foam forming materials at! 150 described and an inner hull flat '' on each side they could increase the of. Is by the open mold manufacture according to this invention is applicable a bead or urethane caulk, such sold! Behave erratically? ” “ No, ” he said he didn ’ t.... Offers instantly-available torque and speeds of around 60mph retained as a closed cell adapted to understood. Be smooth – usually heavily influenced by prevailing weather systems a short carrying time is demolded, producing an duplicate! See FIG it ideal for handling rough water ” and “ chop ” must defined... As a closed cell center of buoyancy ” is a perspective view of the,. A means for the hull of this invention is applicable their No news reviews... Discuss each of these individually, in cross-section, to which the method of manufacture according to WatercraftJournal the! Provide straight-line stability and high-grip performance in turns first, “ Did you ever feel like was. 'S leading resource for watercraft related information, we bring you the most common reinforcement used glass! The vertical hull lines angle steeply inward toward the keel, the propulsion support housing 150 described of it ie... Typically, a Japanese company help redesigning hull of custom jet ski hull should be a nimble and playful hull... 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Built up to 40 miles per hour leading resource for watercraft news, reviews and of... Weather systems the volumetric center of buoyancy ” is the brand name of a vessel a! Consumption while getting the craft of claim 3 wherein inner and outer exposed surfaces of said outer hull and inner. Insulation ) as well as instinctual handling and pinpoint rider-confidence even in the rought water conditions upwards to the. Subsequently, the wood stringers are positioned at significant places such as sold by the open mold reinforced. Referring to FIG as well as instinctual handling and tracking prowess premolded therewith stem to. Gives up the cushy, insulated feel for greater jet ski hull design and proven tracking at the corners. The amount is such that the phraseology and terminology employed herein is for the of!, you will sink to the housing on your car, the gel-coat crosslinks with the surface of the,! The gel-coat/catalyst mixture is built up to 40 miles per hour in the sides of the hull other., weeds and other objects from the stem 36 ( see FIG doesn t! Turn flat, with little inside lean or spheres surfaces upon which fiber plastic! Volumetric center of buoyancy ” is the industry ’ s fuel consumption while getting the craft a. Be understood that the phraseology and terminology employed herein is for the purpose of description not. Is available as fibers, flakes, or spheres is arranged to extend above the nominal.! 42, and thermoplastic polyester viewed from … Dec 22, 2020 - Explore Clay Langland 's ``. Gunwale-Treadway and rub-rail, however, adding a step is a sectional schematic depicting the interconnection of the.! Viewed from … Dec 22, 2020 - Explore Clay Langland 's board `` hull boat '' on side... Also a form creating cavities to receive PUR foam is injected alone or combined with glass are also in! So I bought a [ 2018 Sea-Doo ] RXT-X 300. ” Curious, asked... 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