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Your Self Build Boat Project: Choice of Hull Material Hartley boats are built in six basic stages. 1/ make the strongback (building frame), as the base for building the boat on. 2/ make the frames, stem and rim pieces using the full size frame patterns. 3/set all up on the building frame as shown and attach stringers, sheer etc. 4/attach the plywood sheeting. 5/ finish and attach further fittings etc (any deck and cabin tops in the same manner. Mar 08, �� Boat construction always starts with a hull mold. In this case, a perfectly clean, highly polished two-piece mold to ensure no imperfections make it into the final composite. Layers of gelcoat are sprayed onto the mold to form the outer layer of each hull. Each hull is then laid up with a precise number of layers of fiberglass, resin, and. Sep 11, �� Other axial configurations include plus and minus 45 degrees and either 0 degrees or 90 degrees. The directionality of the fibers enables the engineer to orient them in the direction of the stresses applied to the hull at any location. So, the use of "0" or "+/- degree" fiber doesn't make a boat better; it simply designates the application.
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These can be solid fiberglass or of the sandwich cored type, in which a core of balsa , foam or similar material is applied after the outer layer of fiberglass is laid to the mould, but before the inner skin is laid. This is similar to the next type, composite, but is not usually classified as composite, since the core material in this case does not provide much additional strength.

It does, however, increase stiffness, which Boat Construction Methods 8th Generation means that less resin and fiberglass cloth can be used in order to save weight. Most fibreglass boats are currently made in an open mould, with Fiberglass Boat Construction Methods For Pdf fibreglass and resin applied by hand hand-lay-up method.

Some are now constructed by vacuum infusion where the fibres are laid out and resin is pulled into the mould by atmospheric pressure.

This can produce stronger parts with more glass and less resin, but takes special materials and more technical knowledge.

Older fibreglass boats before were often not constructed in controlled temperature buildings leading to the widespread problem of fibreglass pox, where seawater seeped through small holes and caused delamination.

The name comes from the multiude of surface pits in the outer gelcoat layer which resembles smallpox. Sometimes the problem was caused by atmospheric moisture being trapped in the layup during construction in humid weather. Fast cargo vessels once were copper-bottomed to prevent being slowed by marine fouling. GRP and ferrocement hulls are classic composite hulls, the term "composite" applies also to plastics reinforced with fibers other than glass.

When a hull is being created in a female mould, the composite materials are applied to the mould in the form of a thermosetting plastic usually epoxy , polyester, or vinylester and some kind of fiber cloth fiberglass , kevlar , dynel , carbon fiber , etc. These methods can give strength-to-weight ratios approaching that of aluminum, while requiring less specialized tools and construction skills. First developed in the midth century in both France and Holland, ferrocement was also used for the D-Day Mulberry harbours.

After a buzz of excitement among homebuilders in the s, ferro building has since declined. Ferrocement is a relatively cheap method to produce a hull, although unsuitable for commercial mass production. A steel and iron "armature" is built to the exact shape of the hull, ultimately being covered in galvanised chicken netting.

Then, on a single day, the cement is applied by a team of plasterers. The cement:sand ratio is a very rich ; do not call it concrete! As the hull thickness is typically 2. Properly plastered ferrocement boats have smooth hulls with fine lines, and amateur builders are advised to use professional plasterers to produce a smooth finish. In the s and s, particularly in Australia and New Zealand, the cheapness of ferro construction encouraged amateur builders to build hulls larger than they could afford, not anticipating that the fitting-out costs of a larger boat can be crippling.

See also : concrete ship , concrete canoe. There are many hull types, and a builder should choose the most appropriate one for the boat's intended purpose.

For example, a sea-going vessel needs a hull which is more stable and robust than a hull used in rivers and canals. Hull types include:. Boat construction underway at Bheemunipatnam [19].

From Wikipedia, the free encyclopedia. Not to be confused with shipbuilding. The neutrality of this article is disputed. Relevant discussion may be found on the talk page. Please do not remove this message until conditions to do so are met. July Learn how and when to remove this template message.

Further information: Hull watercraft. Main article: Glossary of nautical terms. ISBN Exterior vs Marine plywood. May be used by those with both low and high skills. Can be worked with fairly basic tools as well as with very sophisticated tools. Can be used in less than perfect building conditions.

Has the qualities of strength and stiffness and can be joined together using both simple and more sophisticated methods and glues etc. Ease of repair depends on method of construction. GRP glass reinforced plastic Single skin - materials are easily available but require controlled conditions for curing etc.

Fairly unpleasant to work with. Requires a lot of tooling ie. Not too difficult to repair. There is a method using sheets of pre laminated grp which can be stitched together much like a stitch and tape plywood hull and then laminated over on the inside the White Swan can be built this way as an alternative to ply construction - in fact most stitch and tape designs can be built this way - this is still a very messy process. Not so easy to attach fittings too the foam needs to be replaced with plywood where fittings are attached which means a lot of pre planning is required.

More difficult to repair than single skin. Steel Low cost. Construction materials easily available and building skills easily acquired. Easy to repair. Can suffer from condensation and corrosion may be a problem. Usually heavy construction and therefore often unsuitable for craft below 20' 6. Aluminium Relatively high cost of materials. Requires specialist welding skills. Has a cold feel Boat Hull Construction Methods Data Science aluminium seats etc feel cold to the touch.

More or less corrosion free and light weight. Relatively easily repaired with the correct welding equipment. Ferro-cement Layers of chicken wire over a steel rod framework and impregnated with cement.

Basic skills required. Difficult to attach other materials to ie. Heavy construction for boats over ' 7. Pros for this type of construction are its immense strength but lightweight qualities, which mean a boat that typically weighs 20, pounds can be constructed to weigh 12, pounds. The drawback is the cost of the composite materials from which this type of boat is built, which can be quite high.

A completely composite hull and deck are generally built much like a cold-molded boat see above , but instead of wood veneers being attached to the jig to form the shape, sheets, panels, and strips of composite foam are used and glued together.

Once the shaped of the hull has been achieved, multiple layers of fiberglass and epoxy are applied. The hull is then flipped, most of the jig removed and discarded, and then more fiberglass laminates, web forms, and stringers are installed to further strengthen the hull form.

The deck and superstructure, like in a cold-molded boat, are produced in much the same way. A stitch-and-glue boat is somewhat like a cold-molded boat in that veneers�in this case, marine-grade plywood�are attached Fiberglass Boat Construction Methods Pdf 2?? to a jig that forms the hull shape. Next, fiberglass cloth is applied to the joints, the interior frames and panel interiors are coated with epoxy, and then the exterior is sheathed in a layer of epoxy resin and fiberglass for strength.

The result is a boat that is both light in weight yet extremely durable and strong. Skip to main navigation. Breadcrumb Home.

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