$@# Fiberglass Boat Building And DIY Guide &^@!

Steel is an excellent boatbuilding material, proven in use worldwide. However, due to the relatively high weight compared to other boatbuilding materials, and the care required in the design stage with regard to hull development, structural integrity, stability, and balance, the plans used to build a steel boat steel boat construction methods 4th be intended specifically for use with this material.

Using plans for a design intended for some other merhods and converting it to steel should not be done, at least without careful and usually costly!

For the amateur steel boat construction methods 4th who has knowledge of proper weld types and welding sequences, together with the necessary electric and gas welding skills, steel is an ideal material. On a cost-per-square-foot basis, steel is probably the cheapest of all boatbuilding materials. Construction is simple when using the building methods specified in GLEN-L steel boat construction methods 4th, and faster than just about any other boatbuilding material.

No special shelters or structures are required, and the materials are readily available just about anywhere without special order. For strength, steel is just about tops in all respects. Repairs and modifications can be easily made anywhere in the world as long condtruction a welding set is available. Numerous welding schools and classes steel boat construction methods 4th available in most areas, either through public school systems or through private trade schools.

As for applying these skills to steel boatbuilding, there are several texts on steel boatbuilding, which we highly recommend to all steel boatbuilders. This general instruction manual discusses the various building procedures and options for 4fh up, proper hull steel boat construction methods 4th sequence, welding recommendations, tank construction, insulating consfruction and materials, joinerywork, electrical, finishing, and much.

Full size patterns mean even faster meyhods since no lofting is necessary. For those who desire to loft their boats, however, a Table of Offsets is also provided. They cover all aspects of the construcgion including structural views and sections, scantlings, cabin construction, joinery arrangements, tank configurations, engine placements, rudders and stele fittings, and spars on sailboat designs.

In short, you get everything you need in the way of information to build your very own steel boat, and at a low price! Steel is usually sold in quantity by weight. Simply use this figure times the cost of steel per zteel in your area to arrive at a reasonable estimate for hull material costs. Aluminum is also a superb material for boatbuilding by the person qualified in aluminum welding.

Aluminum boats using welded marine alloy construction are strong, lightweight, durable, and easy to maintain. As with steel, the designs should be specifically intended for this material. Plans listed for bowt construction include all the details necessary to build the boat construftion sheet aluminum. See our Online Store for additional publications on aluminum construction. Please see our Online Store for all the Glen-L designs available for aluminum construction.

The following can be used as a methodss guideline for selecting materials. However, the listing is not necessarily all encompassing nor given in order of preference. To figure hull cost, use weight of hull times cost per pound.

For further information on welding, see WeldingTipsandTricks. The number of people with aluminum welding skills and access to fabricating equipment has increased considerably over the years.

Yet 4t are unaware of fundamental considerations confronting the short-handed amateur building a single boat for his own account. The would-be do-it-yourself aluminum boatbuilder already familiar with aluminum often has his roots in a non-marine production fabrication setting. Thus there may be a tendency to want to apply mass-production techniques to the construction of just a single boat.

But building a single boat yourself is considerably different from one built on a production line, and thus may require certain adjustments and even a revised mind set on the part of the builder. First, there is no one, superior way to build an aluminum boat. In fact, there can be many suitable approaches and variations. Consider the following. Because production mtehods 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.

For example, they may use special proprietary extrusions to expedite some assembly process such as joining side and bottom plating at the chine see Fig. Alternately, your chines might then be backed mehods a simple round bar Steel boat construction methods 4th. None of these methods is necessarily superior, but just different due to circumstances.

Also, production builders often make up stedl re-usable production jigs over which pre-cut hull panels are assembled and welded. These jigs may zteel rotate to facilitate high-speed welding, with internal members added after the hull is removed from the jig. In either case, end results are much the same and with comparable boat quality.

Using a frame substructure for setting up your hull has several advantages for the do-it-yourselfer typically working. First the frame substructure makes it easy to assure hull accuracy that is so important to ultimate performance in a powerboat. Factory production boatbuilders often use specialized forming equipment not always available to amateurs, or use forming services that might be provided by metal suppliers when quantity requirements are high.

Conversely, a design for the do-it-yourself builder would more likely specify internal steel boat construction methods 4th stiffeners i. Either method gets the job done but the latter is easier and cheaper for most building their own boats. First, a disclaimer. But in reality few do-it-yourselfers want to Boat Hull Construction Methods 3d pay the price for the service. But steel is considerably heavier than aluminum, so baot designed for steel are usually designed for greater displacement.

The consequences for a semi- or full-planing powerboat conztruction be so much the better since the lighter aluminum boat will need less power and fuel. But in constructiln slower displacement-type powerboats from steel to aluminum, you might need to add ballast into such a boat done in aluminum to bring it back down to its original lines. This may place the center of gravity too far below that of its steel brethren and result a snappy, jerky motion.

So steel boat construction methods 4th, you may want to place some of the added weight higher up. Aluminum is not as strong as steel so some compensations must be made if using it in place of steel. Without getting too technical, with aluminum mefhods for shell plating e.

Put another way, to get the same strength as steel in an aluminum hull, it needs to be approximately half the weight of steel. More important is how the two perform under repeated fatigue loading stress cycles alternating between tension and compression. Tests show that for stesl similar number of cycles, steel stays above its yield strength threshold. In other words, it is more likely to fail due to fatigue over time, an important consideration for boats subject to such conditions i.

But by how much? Converting from steel to aluminum is fairly straight-forward mainly because the members used are much the same steel boat construction methods 4th configuration and the methods of design and construction are similar. And while there are standards-making organizations e. Consider plating thickness. On the steel boat, this is more often based on the practical minimum necessary to ward off corrosion over time, provide decent welds, and a thickness adequate to minimize unsightly cnostruction.

Thus 10GA. And in most cases this increase applies mostly to thickness alone as is listed in Fig. An operating premise is that steel boats in the size range discussed are almost always stronger than is necessary; this due to the nature of the material, for reasons previously noted, and the fact that the shape of most boats adds strength in and of itself, and often where it does the most good such as in the bow.

So using the example, 10GA. Steel boat construction methods 4th other words, multiply the thickness of the steel noat by a factor of from 1. Tip: Steel boat construction methods 4th with 1. The point is, many alternatives can be used to build an aluminum boat with largely the 4gh results in terms of strength, durability. In the above constduction referring to Fig. First, the extra strength that a shaped member would provide in the steel boat is simply redundant in the size boats discussed; it would just add weight, cost, and Boat Hull Construction Methods Java complexity.

Second, shaped members steel boat construction methods 4th to the difficulties of inspection, maintenance, and corrosion protection in the steel boat; for example, the ability to see and coat the underside flanges is difficult, steel boat construction methods 4th when such kethods are small.

However, in the steel boat construction methods 4th boat in Fig. But there are several reasons for using shaped members, especially for longitudinal stiffeners. First, such members are stronger. Or put another way, you could have the same strength in a lower-profiled shape steel boat construction methods 4th with flat bar. And the added strength in the aluminum boat is a plus.

Another benefit might be more usable interior volume. They tend not to be so floppy, and bend more uniformly than flat bar. The downside is that extrusions methkds more than flat bar or the sheet stock one can use consgruction make flat bars, and may not be readily available at least in the size you want. If working from stock plans for an aluminum boat, the designer probably specified certain sizes, types, and alloys of members for framing.

But deviations may be possible. Most designs have some latitude in alternates that can be substituted. Channels can be made from split metohds or rectangular tubing, or even split pipe if somewhat larger than the specified channel.

You could even fabricate your own sectional shapes from built-up flat bar. Then too, if members are not available in one size, perhaps steel boat construction methods 4th the next size up will suffice. However, you should always consider the consequences of added weight that such a change might make. Conversely, it is probably better to avoid downsizing to a smaller member 4fh the opposite alternative.

To the novice, there is a bewildering array of aluminum alloys available. But for cosntruction welded aluminum boat, the choices narrow down to the so-called marine alloys in the and series, the latter typically being extrusions.

Yet even within these series there are still many alternatives. But the most common, readily available, and suitable for welded boat hulls 4gh H32 H34 H H32 H H However, the designer may have already taken this stedl consideration if is specified. Corrosion resistance for the alloys listed above is excellent in constructon cases. The material has good corrosion resistance also and is commonly used for extruded nethods.

Update:

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Designs for Steel Construction. All of the Glen-L boats that are designed specifically for steel construction are in this category. These designs may also have an alternate building method and if so, will be noted in the design description. 16' Sweet 16 - mini-cruiser tug. This is of course not a fixed limit. The boundary of what can be built in steel is less a matter of boat length than it is a matter of shape and displacement. With proper design, one can successfully create a steel boat for coastwise or blue water sailing down to around 28 to 30 feet LOD. A Discussion of Metal Boat Building Methods. There are a number of approaches one can take when fabricating a new metal boat. Among them are methods that erect the framing first and apply the plating to that structure afterward, and others that favor pre-planning the plate shapes in order to create the hull shape before the frames are.

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