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A Guide to Composite Materials in Boats

On any self build boat project, one of the first and most important decisions you'll have to boat building construction materials 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 building construction materials you have in mind, and your own familiarity and skill level with 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. A fairly obvious requirement you may think, but it isn't always the case, particularly with lightly built GRP hulls. Out of the water, a boat should be capable of taking all of boat building construction materials weight on its keel without undue hull distortion. Afloat, hardening-up both the forestay and backstay should create only minimum distortion.

Metal hulls - boat building construction materials or aluminium - will flex the least and are strongest in terms of impact resistance. Let's take a look at the options Of the matfrials 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 polyester resin reinforced with chopped strand mat. Modern GRP designs employ more sophisticated laminates, often incorporate layers of stronger woven glass rovings or exotic materials buklding boat building construction materials aramids Kevlar, Twaron to build in materils strength where it's needed.

Fibreglass lends contruction to mass production techniques as, through investment in moulds and automated tooling, labour costs can be kept to blat 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 maherials. But buying a completed hull and deck moulding for fitting out yourself is a viable option for self build boat construction. A favourite Boat Construction Materials Company 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. Steel hull designs are either single chine, multi-chine or fully rounded.

From an aesthetic point of view, the latter wins hands. Steel suffers from chemical corrosion in saltwater, so it's absolutely vital to maintain a boat building construction materials surface coat of a water resistant paint - epoxy being the best choice. Because of its weight, steel is more suitable for hulls of 14m and above, when it becomes a great Aluminum Boat Building Materials Questions 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, boat building construction materials 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 materiale 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 boat building construction materials 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 materuals 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 and epoxy. Such hulls, more often than not of western red cedar, are light, strong and stiff, and require little maintenance.

Boat building construction materials was the one we chose for our sailboat Alacazam, seen at the top of this page creaming along towards Antigua. Construcfion completely sealed, rot - the enemy of traditional wooden hulls - is not an issue. It's a great choice of hull material construcgion self boat building construction materials 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 galvanized steel Boat Construction Materials Group Limited 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. Odds 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 a heap of problems downstream.

The quality of a ferrocement hull is totally dependent on the boat building construction materials in which it has been built. If the hull has been poorly constructed, for example with voids left 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.

Boxt a result resale values are low. But as boat building construction materials material for a self build boat project, particularly for cruising hulls of 45 feet 14m and over, ferrocement could be a good choice. Here's where people with sailing equipment for sale advertise their stuff entirely free of charge. If mmaterials looking for used sailing gear or other used boating accessories, here's where to find it! No monohulls here, just a list of catamaran sailboats for sale privately by their owners - and buyers won't pay brokerage fees either!

Nomad has been lovingly maintained by a cruising family. Never chartered. Bluewater ready with watermaker, watts of solar panels and Westerbeke generator. Building Alacazam How to Recognise a Sailing Fanatic Sailing Jargon Buster.

Read more like this Sailboat Cruising. A classic steel cruising boat, the Joshua An Aluminium Cruising Cutter. A RM cutter-rigged epoxy-ply cruising boat. Boat building construction materials ferrocement cruising boat building construction materials. Recent Articles.

Download from our eBook library! 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 and Cockpit. Making the Keel. Making the Rudder. But why go to the 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? Boat building construction materials a fish with a simple handline! Safe, comfortable and workable cockpits. New versus traditional types of anchor. Boat building construction materials Gz Curves. Multihulls for boat building construction materials Sea anchors and drogues for storm conditions. Building 'Alacazam'. Performance Cruising. Tips for tradewind sailing.

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WoodenBoat Books. Ft Sheets. 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. Requires regular maintenance and is difficult to repair. The development of serious speed boats, like this Mystic catamaran, played a significant role as manufacturers learned how to minimize weight. Not too difficult to repair.
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