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A lot of marketing effort goes into discussing how different fiberglass yachts get built. The basic fact to keep in mind is that the choice of a laminating technique is not, in and by itself, as important as the ultimately achieved quality of the manufactured Fiberglass Boat Construction Methods Pdf 2?? product. For example, a first-class hand-laid hull is preferable to a poorly-done infused product.

Yachts are self-propelled mobile structures that require motive power. Because greater weight generally requires increased motive power, one of the goals in FRP laminates is to optimize strength-to-weight ratio. This usually involves maximizing in the final product the ratio of contained reinforcing fabric to surrounding resin polymer matrix.

Hand lay-up involves placing pieces of precut reinforcing fabric into the boag hand laid fiberglass boat construction 3d or mold and saturating them with catalyzed or co-reacted liquid polymer � polyester, vinyl ester, or epoxy resin. Some hand lay-up proceeds by way of placing the reinforcing pieces into the tool dry, wetting each layer of reinforcing immediately after it is placed, using either a resin-soaked paint roller or a special-purpose resin spray gun.

Sometimes pre-cut pieces of reinforcing fabric are pre-wet by soaking them in a resin bath, then run through adjustable pinch rollers to squeeze out excess resin, and hand laid fiberglass boat construction 3d wet, layer by layer into the constryction.

As each layer of material is placed and wet out, it is compacted to the layer that preceded it, using squeegees and construftion aluminum rollers that work to force resin throughout the layer of hand laid fiberglass boat construction 3d and squeeze excess resin to the top surface of the laminate, where it is scooped up by various methods and disposed of.

As you might expect, hand lay-up is highly labor-intensive. It was fast. It was cheap. And it can produce a high-quality product, albeit one that, all other factors equal, will be a bit heavier for a given strength than a laminate laid up using vacuum infusion techniques. Once all the dry layers in the stack hand laid fiberglass boat construction 3d placed, the entire stack is saturated in one fell swoop with hand laid fiberglass boat construction 3d by drawing the resin through the reinforcing by means of a vacuum pump or pumps.

During infusion, the fabric stack is sealed over with air-tight heavy-duty hand laid fiberglass boat construction 3d sheeting, So, as the vacuum draws the resin through the stack of reinforcing materials, the vacuum sucking on the plastic hand laid fiberglass boat construction 3d sheet also compacts the various fabric layers tightly. The result is a very strong structure at minimum weight. The operational advantages of infusion include 1 reduction of escaped VOCs OSHA and EPA thank you2 extended time for accurately cutting and placing reinforcing layers, and 3 maximum lid with integrated removal of excess resin from the lay-up.

The downsides of infusion include the possibility of a constructino to fully infuse due to a rupture of the bag seal and a resultant loss of vacuum during the process. They also include the possibility of an insufficiently complete wet-out of the reinforcing material that leaves dry spots in the laminate which must be cut out and patched post-infusion. As well, infusion is generally more expensive than hand lay-up. Although the labor in vacuum infusion might be less, the materials and consumable items associated with the process are relatively quite expensive.

A commonly misconception abounds that hand-laid laminates are necessarily inferior Fiberglass Boat Construction Methods For Pdf in strength to infused laminates. Which is poppycock. Provided all other factors are held equal � namely, that resins with equivalent post-cure mechanical properties are used in both cases, and very similar types, quantities, and placement of reinforcing materials are employed � a hand-laid hand laid fiberglass boat construction 3d will be very close in strength to that of its cconstruction infused version.

Whoa, you say, how can that be? Why do so many builders extol the virtues of their vacuum infused laminates? That works well for homogeneous materials such as steel and aluminum. But fiberglass laminate is a composite material made up Fiberglass Boat Construction Methods Pdf Online of glass or other reinforcing fiber encased in a polymer resin voat. So understanding the comparative strengths of various different laminates is a lot more complicated.

Let me explain. The absolute tensile and bending strengths of an FRP laminate depends almost entirely on the strength, boqt, and type of the contained glass or other fibers and their orientation in the cured final product.

So if two almost identical hulls are laid up, one call it Hull A using hand-lay techniques and the other call it Hull B using vacuum infusion procedures, with identical configurations of fiber reinforcing, hull A will end up with more resin in its cured laminate than hull B.

Consequently, hull A will be not only a bit heavier, but somewhat thicker. But since A has more cross-sectional area because it is thicker than B, the two end up having the same strength when considered on an absolute basis. So then, you ask, what is the big consteuction and why all the touting of vacuum infusion over hand lay-up?

The big deal is that good infused laminates generally achieve the same strength at less weight hand laid fiberglass boat construction 3d an equally good hand lay-up. And in yachts, you will remember, weight reduction almost always makes a difference to performance and range.

The other plus on the infusion side of the ledger is that vacuum infused laminates commonly exhibit more uniformity and predictability than hand laid fiberglass boat construction 3d laminates, in terms of their post-cured mechanical properties.

And uniformity and predictability are key elements in being able to more accurately engineer the structures built up of those laminates. Read more articles from Phil Friedman:. View Article. Annapolis Harbor First St.

Execution Is King The basic fact to keep in mind is that the choice of a laminating technique is not, in and by lald, as important as the ultimately achieved quality of the manufactured product. Hand Lay-Up Hand lay-up involves placing pieces of precut reinforcing fabric into the female tool or mold and saturating them with catalyzed or co-reacted liquid polymer � polyester, vinyl ester, or epoxy resin.

Busting a Common Myth A commonly misconception abounds that hand-laid laminates are necessarily inferior in strength to infused laminates. Contact Seattle Yachts. Going World Cruising? Not So Fast.

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Mar 30, �� The irony of boat building is that while Aluminum is a heavier material than fiberglass, aluminum boats tend to be lighter. Fiberglass really pays dividends in allowing tailored, optimized hull shapes. Some of the reasons fiberglass boats were penalized with weight are evaporating as construction methods have improved and glass content has. Sep 11, �� Boat Construction Comparison. What you need to know about how your boat is made. The risk of increased costs and lost time on the water associated with using plywood in a new fiberglass boat are far too high to buy one using them. In the hand-laid days, a good installation was like pinning the tail on the donkey. Builders were. Jun 17, �� �Victory� Is a Hylas 46 has a solid hand laid fiberglass, hand laid fiberglass hull with Twaron laminates, vinyl-ester resins, and isophthalic gelcoat. Most buyers in the market for sailing or motor yachts consider fiberglass construction their first choice. However, many are not familiar with the differences in hull construction.

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