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Boat building - Wikipedia

On any self build boat project, one of the first and most important decisions you'll have to make is the choice of hull material.

Your final choice will be made on the hull material's suitability for the type or size of boat you have in methoxs, and your own familiarity and skill level bull that material. For instance, you wouldn't choose steel for a 25 foot sailboat - it would be way too heavy - nor would you go for aluminium if you didn't know how to weld, or weren't prepared to learn.

Sailboat hulls should be both strong and rigid. Liimited fairly obvious requirement you may think, but it isn't always the case, constructiin with lightly built GRP hulls. Out of the water, a boat should be capable of taking all of its weight on its keel without undue hull distortion. Afloat, hardening-up both the forestay and backstay should create only minimum distortion.

Metal hulls - steel or boat hull construction methods limited - will flex the least and are strongest in terms of impact resistance. Let's take a look at the options Of the four basic materials - GRP, metal, wood and ferrocement - GRP glass reinforced plastic is the material of choice for production boats. Glassfibre, as it's almost universally known fiberglass in the USis in its basic form boat hull construction methods limited resin reinforced with chopped strand mat.

Modern GRP designs employ more sophisticated laminates, often incorporate layers of stronger woven glass rovings or exotic materials such as aramids Kevlar, Twaron to build in additional strength where it's needed. Fibreglass lends itself to mass production techniques as, through investment in moulds and automated tooling, labour costs boat hull construction methods limited be kept to a minimum and hulls of consistent quality produced in high volume.

Clearly, it's not the material of choice for self build boat builders. The cost of building a plug, then the mould, would make the whole venture totally uneconomic for a single hull. But buying a completed hull and deck moulding for fitting out yourself is a viable option for self build boat construction. A favourite choice of material for the amateur or one-off builder, not just for the inherent strength of a metal hull, but also because of the relative low cost of the raw material and the ease of construction for those with welding skills.

Meyhods hull designs are either single chine, multi-chine or fully rounded. From an aesthetic point of view, the latter wins hands boat hull construction methods limited. Steel suffers from chemical corrosion in saltwater, so it's absolutely vital to maintain a protective surface coat of a water resistant paint - epoxy being the best choice.

Because Boat Hull Construction Methods Data Science of its weight, steel is more suitable for hulls of 14m and above, when it becomes a great choice for self build boat construction providing you have the welding skills. Aluminium is more difficult to weld than steel but has the advantage of a better strength-to-weight ratio, and it doesn't suffer from saltwater corrosion.

In fact some owners are happy to leave their vessels unfaired and unpainted, accepting with a Gallic shrug the appearance of the protective coating of aluminium oxide that quickly builds up. But aluminium is susceptible to electrolytic and galvanic corrosion by contact with dissimilar metals, or through improperly designed or installed electrical systems.

Sacrificial zinc anodes are essential to keep galvanic corrosion at bay. Many owners, wary of stray electrical currents, choose to dangle a few additional ones over the side when in marina berths but a better form of protection would be to fit an 'isolating transformer' or a 'galvanic isolator' so there are no interactions with the marina's shore supply.

Modern wooden hulled cruising boats are usually strip-planked and epoxy sheathed. This technique lends itself to custom self build boat construction as no moulds are required, the hull being built upside down around temporary timber frames.

The planks are glued one to the other with epoxy, and the completed hull is sheathed in layers of woven glass rovings Boat Hull Construction Methods 70 and epoxy. Such hulls, more often than not of western red cedar, are methodss, strong and stiff, and require little maintenance. It was the one we chose for our sailboat Alacazam, seen at the top of this page creaming along towards Antigua.

Being completely sealed, rot - the enemy of traditional wooden hulls - is not an issue. It's a great choice of hull material for self build boat construction. However, in recent years epoxy-impregnated plywood hulls are being produced.

The light displacement RM shown here is a typical example, where its open plan interior is made possible through the use of a construcgion steel framework. We're back in heavy displacement territory. Although the process is labour intensive, the construction materials are comparatively inexpensive, making them an attractive building option to someone with more time on his hands than cash in his pocket.

Occasionally you'll find a completed ferrocement hull on the secondhand boat market. Mefhods are it will be at a very attractive price, and may seem perfect for fitting out to your own requirements.

But beware, because unless it's been built by a specialist boat builder skilled in the technique, you could be letting yourself in for boat hull construction methods limited heap of problems downstream. The quality of a ferrocement hull is totally dependent on the manner in which it has been built.

If the hull has been poorly constructed, for example with voids boat hull construction methods limited in the mortar or with inadequate bonding to the mesh reinforcement, then it will be structurally unsound at best and may be very weak. Ferroconcrete boats are difficult to insure at reasonable premiums, some insurance companies being unwilling to provide cover at any price.

As a result resale values are low. But as a material for a self build boat project, particularly for cruising hulls of 45 feet 14m and over, ferrocement could be Boat Hull Construction Methods Zero a boat hull construction methods limited choice.

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Building Alacazam How to Recognise a Sailing Fanatic Sailing Jargon Buster. Methhods more like this Sailboat Cruising. A classic steel cruising boat, constructino Joshua An Aluminium Cruising Cutter. A RM cutter-rigged epoxy-ply cruising boat. A ferrocement cruising cutter. Recent Articles. Download from our eBook boat hull construction methods limited Here's where to Buy a Used Sailboat Buy Used Sailing Gear Sell Your Sailboat Sell Your Sailing Gear Getting Started.

Building the Hull. Sheathing the Hull. Installing the Bulkheads. Building the Interior Structure. The Deck and Coachroof. The Cabin Top hill Cockpit. Making the Keel. Making the Rudder. But why go to boag bother of building your own boat?

Here's Why! A few of our Most Popular Pages How to anchor Right First Time! Is a heavy displacement sailboat best for cruising? Catch a fish with a simple handline! Safe, comfortable and workable cockpits. New versus traditional types of anchor. Understanding Gz Curves. Multihulls for cruising? Sea anchors and drogues for storm conditions. Building 'Alacazam'. Performance Cruising.

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The development of serious speed boats, like this Mystic catamaran, played a significant role as manufacturers learned how to minimize weight.

It was the cost of construction, however, that spurred on this trend among boat-builders of all types. Two examples of fiberglass cloth: the fiberglass at the left is significantly thinner and lighter, but provides less stiffness.

You can see the core with checkered appearance in this part, about to be vacuum-bagged at Sabre Yachts. Photo Credit: Sabre Yachts. Although many modern boatbuilders eschew the use of wood, on high-end custom yachts like this Jarrett Bay, methods like cold molding are often considered superior to more modern techniques. Back Explore View All. Back Types View All.

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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 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 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 Retrieved The Austronesians: Historical and Comparative Perspectives. ANU E Press. International Journal of Nautical Archaeology.

Canoes of the Grand Ocean. BAR International Series Clinker Plywood Boatbuilding Manual. WoodenBoat Books. Archived from the original on History Glossary Wood lumber. Frame and panel Frameless construction. Category WikiProject Commons. Ancient shipbuilding techniques Shipbuilding in the early modern era Shipbuilding in the American colonies. Dugout Carvel Clinker Strip-built Mortise and tenon.

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