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Chapter One APPLICATIONS Canoes and Kayaks Competition canoes and kayaks employ advanced composites because of the better performance gained from lighter weight, increased stiffness and superior impact resistance. Aramid fiber reinforced composites have been very successful, and new fiber technologies using polyethylene fiber reinforcement are now being attempted. The boat that won the U.S. National Kayak and Canoe Racing Marathon was constructed with a new high molecular weight polyethylene fiber and was 40% lighter than the identical boat made of aramid fiber. [1-1] Evolution of Recreational Boat Construction Techniques From the 1950s to the 1990s, advances in materials and fabrication techniques used in the pleasure craft industry have helped to reduce production costs and improve product quality. Although every boat builder employs unique production procedures that they feel are proprietary, general industry trends can be traced over time, as illustrated in Figure 1-10. 500 400 300 200 100 Pounds of Reinforcement (millions) Hand Lay-Up Mat and Woven Roving Alternative Resin Development Alternative Reinforcement Materials Use of Infusion and Vacuum Techniques Sandwich Construction Advanced Fabrication Techniques 0 1960 1963 1966 1969 1972 1975 1978 1981 1984 1987 1990 1993 1996 Year Figure 1-10 Annual Shipment of Reinforced Thermoset and Thermoplastic Resin Composites for the Marine Industry with Associated Construction Developments. [Data Source: SPI Composites Institute (1960-1973 Extrapolated from Overall Data)] 9PDF Image | Marine Componsites
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