Kayak - Materials of Construction:
It can be said that modern materials of construction are the key to the growth of kayaking as a popular sport. In other words, if kayaks were still being made from wooden frames covered in animal hides, the sport would be very handicapped in popularity for a number of reasons including high cost, high maintenance, and animal rights issues. Instead, we see that kayaking is experiencing explosive growth in popularity.
Let's look at the different materials used and their advantages and disadvantages. These are listed in chronological order of appearance and development to emphasize the corelation between the newer materials and the kayaking sport's growth.
Drift Wood and Seal Skin.
Generally only used north of the artic circle by die hard purists and out of sight of animal rights activists. Not an off-the-shelf item. Produced only by the paddler himself. Time consuming and expensive. Must be oiled regularly with natural oil such as seal fat.
Wood and Plywood.
A step up from wood and seal skin but still not a realistic choice for most paddlers. It is not an off-the-shelf item. Generally only produced only by the paddler himself. Weight is usually high making handling difficult and reducing payload. Time consuming and expensive to build. Difficult to repair. Limited life span for the materials.
Wood or Metal Frame and Fabric Skin.
This method is still used today, particularly on folding kayaks. The flexible fabric skin can aid in stability but may adversely affect speed performance. It is light weight and is the preferred material blend for most folding models. This method is, however, expensive and difficult to repair. The fabric also has a limited life span. Fabrics originally used were canvas but now more modern stronger fabrics are available.
Polyethylene.
Plastic kayaks are the least expensive and the most common. At the factory, pelletized plastic material is poured inside a mold and then heated and rotated in what is called a Roto-mold process. The plastic takes the shape of the inside of the mold. The process is challenging as cooling the plastic results in shrinkage and improper techique can result in warping and distortion. Yet, it is an inexpensive method to mass produce recreational kayaks. The polyethylene is robust but heavy, thereby limiting the boats performance. UV inhibitors in the plastic give it a long life. The seats are often molded as part of the hull and are non-adjustable. This one size fits all design reduces crew comfort and often limits use to short range pleasure boating.
Thermoform.
This is not to be confused with polyethylene material and the Roto-mold process. This method uses sheets of hybrid plastic materials wrapped around the outside of a mold. This material is stronger and harder than polyethylene. It has a glossy finish similar to fibreglass. It gives superior performance than polyethylene and generally weighs the same as fiberglass. It is less expensive than composites but more expensive than polyethylene. It is very durable and long lasting. This method is very quickly becoming the method of choice for intermediate priced boats.
Composite.
Composite means a blend of materials which are held together by a resin or Epoxy. In modern language sense "composite" is an all inclusive term that includes a number of newer materials including fiberglass, Kevlar and carbon fiber. These kayaks are built by applying sheets of the composite material over a gel coated mold. Then the sheets are coated in a bonding resin. Several layers are added for strength, ridgidity, puncture and tear resistance. The last outer layer of gel coat on an exterior mold gives a very smooth glossy surface. The result is a boat hull that is both light weight and very very strong. Fibreglass units are about 20% lighter than a similar polyethylene boat. Kevlar and carbon are even lighter still. These materials and the method of manufacture make these boats the most expensive. They can be repaired with little weight penalty after suffering even serious damage.
Materials for Sea Kayaks.
Because of the type of service that a sea kayak will likely see in its travels, certain materials are not suitable because of the high weight or lack of strength or rigidity. Polyethylene, for instance, is too heavy and lacks the strength and rigidity needed for a true sea kayak. Most modern and sea kayaks are manfactured using the thermoform method or from composites such as fibreglass or kevlar.
Your choice.
Frontenac Outfitters stocks a complete range of polyethylene, thermoform and composite recreational, day touring and sea kayaks. Check out the specifications, pictures, and prices on-line. Better yet, come to our paddlesports centre & speak with our experts first hand. Then take a bunch out for a paddle and see for yourself... that's what makes Frontenac Outfitters a superior purchasing experience.
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