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A hull is the watertight body of a ship or boat. The hull may open at the top such as a dinghyor it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructuressuch as a funnel, derrick, or mast.

The line where the hull meets the water surface is called the waterline. There is a wide variety of hull types that are chosen for suitability for different usages, the hull shape being dependent upon the needs of the design. Shapes range from a nearly perfect box in the case of scow barges to a needle-sharp surface of revolution in the case of a racing multihull sailboat. The shape is chosen to strike a balance between cost, hydrostatic considerations accommodation, load carrying, and stabilityhydrodynamics speed, power requirements, and motion and behavior in a seaway and special considerations for the ship's role, such as the rounded cknstruction of an icebreaker or the flat bottom of a landing craft.

In a typical modern steel ship, the hull will have watertight decks, and major transverse members called bulkheads. There may also be intermediate members such as girdersstringers and websand minor members called ordinary transverse frames, frames, or longitudinals, depending on the structural arrangement.

The uppermost continuous boat hull construction methods online may be called the "upper jethods, "weather deck", "spar deck", " main deck ", or simply "deck". The particular name given construcion on the context�the type of ship or boat, the arrangement, or even where it sails.

In a typical wooden sailboat, condtruction hull is constructed of wooden planking, supported by transverse frames often referred to as ribs and bulkheads, which are further tied together by longitudinal stringers or ceiling. Often but not always there is a centerline longitudinal member called a keel. In fiberglass or composite hulls, the structure may resemble wooden or steel vessels to some extent, or be of a monocoque arrangement. In many cases, composite hulls are built by sandwiching thin fiber-reinforced skins over a lightweight boat hull construction methods online reasonably rigid core of foam, balsa wood, impregnated paper honeycomb, or other material.

Perhaps the earliest proper hulls were built by the Ancient Egyptianswho by BC knew how to assemble wooden planks into a hull. Hulls come in many varieties and can have composite shape, e. At present, the most widely used form is the round bilge hull. With metohds small payload, such a craft has less of its hull below the waterlinegiving less resistance and more speed. With a greater payload, resistance is greater and speed lower, but the hull's outward bend provides smoother performance in waves.

As such, the inverted bell shape is a popular form used with planing hulls. A chined hull does not have a smooth rounded lower cross-section. Constructioj, its contours are interrupted by hard angles where components of the hull boat hull construction methods online underwater. Benefits of this type of hull include potentially lower production cost and a metuods fairly flat bottom, making the boat faster at planing. Sailboats with chined hull make use of a daggerboard or keel.

Each of these chine hulls has its own unique characteristics and use. The flat-bottom hull constructiom high initial stability but high drag. To counter the high drag, hull forms are narrow and sometimes severely tapered at bow and stern. This leads to poor stability when heeled in a sailboat. This is often countered by using heavy interior ballast on sailing versions.

They are best suited to sheltered inshore waters. Early racing power boats were fine forward and flat aft. This produced maximum lift and a smooth, fast ride in flat water, but this hull form consttuction easily unsettled in waves.

The multi-chine hull approximates a curved hull form. It has less drag than a flat-bottom boat. Multi chines are more complex to build but produce a more seaworthy hull form.

They are usually displacement hulls. V or arc-bottom chine boats have a V shape between 6 and 23 degrees. This is boat hull construction methods online the deadrise angle.

The flatter shape of a 6-degree hull will plane with boat hull construction methods online wind or a lower-horsepower engine but will pound more in waves. The deep V form between 18 and 23 degrees is only suited to high-powered planing boats. They require more powerful engines to lift the boat onto the plane but give a faster, smoother ride in waves.

Displacement chined hulls have boat hull construction methods online wetted surface area, hence more drag, than an equivalent round-hull form, for any given displacement. Smooth curve boat hull construction methods online are hulls that use, just like the curved hulls, a centreboard, or an attached keel. Semi round bilge hulls are somewhat less round. The advantage of the semi-round is that it is a nice middle between the S-bottom and chined hull.

Typical examples boat hull construction methods online a semi-round bilge hull can be found in the Centaur and Laser cruising dinghies. S-bottom hulls are hulls shaped like an s. This is a short fixed keel, with a swing keel inside. Coefficients [4] help compare hull forms as well:. Use of computer-aided design has superseded paper-based methods of ship design that relied on manual calculations and lines drawing. Since the early s, a variety of commercial and freeware software packages specialized for naval architecture mthods been developed that provide 3D drafting capabilities combined with calculation modules for hydrostatics and hydrodynamics.

These may be referred to as geometric modeling systems for naval architecture. From Wikipedia, the boat hull construction methods online encyclopedia.

Watertight buoyant body boat hull construction methods online a ship or boat. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. Further information: Chine boating. Further information: Smooth curve hull.

See also: Boat building. This article contains translated text and needs attention from someone with dual fluency. Please see this article's entry on Pages needing translation into English for discussion. See also: Naval architecture. Main article: Glossary of nautical terms. Anti-fouling paint Boat � vessel for transport by water Cathedral hull Chainplate Copper sheathing Displacement�length ratio Double hull Draft � The vertical distance between the waterline and the bottom of the hull keel Froude number � A construchion number defined as the ratio boat hull construction methods online the flow inertia to the external field Hull classification symbol Hull speed � The speed at which the wavelength of a vessel's bow wave is equal to the waterline length Lift boat hull construction methods online � Force perpendicular to flow of surrounding fluid Monohull Multihull � Ship or boat with more than one hull Naval architecture � Engineering discipline dealing with the design and construction of marine vessels Nelson Chequer � Colour scheme adopted by vessels of the British Royal Navy Ship measurements Shipbuilding � Mehtods of ships and floating vessels Submarine � Watercraft capable of independent operation underwater Submarine hull.

Archaeological Institute of America. International Conventions. Admiralty and Maritime Law Guide. Retrieved In ships with rounded gunwalesthe upper measurement point is take to the point at which the planes of the deck and side plating intersect. Ships with stepped decks are measured to a line parallel with the upper. Basic Ship Theory. ISBN X. Centre for Marine Technology hull Ocean Engineering. Retrieved 29 March Boat hull construction methods online of a sailing ship. Ship measurements.

Length overall Length between perpendiculars Length at the waterline. Tonnage Gross tonnage Compensated gross tonnage Net tonnage. Gross register tonnage Net register tonnage. Deadweight tonnage Twenty-foot equivalent unit Intermodal containers. Builder's Old Measurement Moorsom System. Displacement Loaded displacement Standard displacement Light displacement Normal displacement. Categories : Shipbuilding Watercraft components Naval architecture Structural system Structural engineering Ship measurements Egyptian inventions.

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Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Wikimedia Commons. Wikimedia Commons has media related to Hull watercraft. Worldwide Tonnage Gross tonnage Compensated gross tonnage Net tonnage. Current Deadweight tonnage Twenty-foot equivalent unit Intermodal containers.

In short, general practice is to NOT weld plating to transverse frames or bulkheads even if such members touch or come near the plating. Because production builders are always thinking up ways to cut labor and material costs, and time required to build boats, they evolve specialized methods and materials that help toward these ends even if there is not necessarily any improvement in the boat itself. For steel, we have had to remodel the hull to give more displacement volume by increasing beam and hull depth see our 22' Black Swan yacht and we can do this for many of our designs. The veneers themselves are generally glued together using epoxy resin, and the outside of the formed veneer hull often is reinforced with layers of epoxy resin and fiberglass on both the inside and outside for strength and protection. The difference between our building materials and others. We're looking at making our own purpose-built FRP hulls for our tailboat product www.
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