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Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
A whitewater canoeist paddling a Royalex canoe. The best known use of Royalex is for the manufacture of canoe hulls.Royalex is lighter, more resistant to UV damage from sunlight, more rigid and has greater structural memory than non-composite plastics used for this purpose, such as polyethylene.
Pro level slalom competitions have specific length (350 cm (140 in) for kayaks - new rules), width, and weight requirements for the boats, which will be made out of kevlar/fiberglass/carbon fiber composites to be lightweight and have faster hull speed. Plastic whitewater canoes can be used in citizen-level races.
Kevlar has gone on to save lives as a lightweight body armor for police and the military; to convey messages across the ocean as a protector of undersea optical-fiber cable; to suspend bridges with super-strong ropes; and to be used in countless more applications from protective clothing for athletes and scientists to canoes, drumheads, and ...
Royalex – many whitewater canoes are now made using this composite material which has an outer layer of vinyl and ABS with an inner layer of ABS foam, bonded by heat treatment. [6] Modern canoe/kayak designs – in general, each of the activities mentioned above requires a type of boat specifically designed for that activity.
In 1973, DuPont was the first company to introduce a para-aramid fiber, calling it Kevlar; this remains one of the best-known [citation needed] para-aramids and/or aramids. In 1978, Akzo introduced a similar fiber with roughly the same chemical structure calling it Twaron .
A carbon-fiber and Kevlar canoe (Placid Boatworks Rapidfire at the Adirondack Canoe Classic) CFRPs are now widely used in sports equipment such as in squash, tennis, and badminton racquets, sport kite spars, high-quality arrow shafts, hockey sticks, fishing rods, surfboards, high end swim fins, and rowing shells.
Traditional akuilisaq (left) and tuilik (right), ~1893 sketch. A kayaker with water washing harmlessly over his stern and the rear of his spraydeck. A spraydeck (sprayskirt in N. America, akuilisaq or tuiitsoq in Greenland) is a flexible waterproof cover for a boat (in particular for a kayak or a canoe) with holes for the passengers' waists.
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