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Recreational Use of FRP Marine Composites Several classes of boats were early pioneers for various construction and production techniques and are presented here as illustrations of the industry’s evolutionary process. Sunfish The perennial sunfish has served as the introduction to the sport for many sailors. The simplicity of the lanteen rig and the board-like hull make the craft ideal for beaching and cartopping. Alcort has produced over 250,000 of them since their inception in 1952. The basically two-piece construction incorporates a hard chine hull to provide inherent structural stiffening. Boston Whaler Boston Whaler has manufactured a line of outboard runabouts since the early 1960s. The 13 foot tri-hull has been in production since 1960, with over 70,000 built. The greatest selling feature of all their boats is the unsinkable hull construction resulting from a thick foam sandwich construction. Hull and deck sections are sprayed-up with ortho-polyester resin to a 33% glass content in massive steel molds before injected with an expanding urethane foam. The 134 to 212 inch core provides significant strength to the hull, enabling the skins to be fairly thin and light. Another interesting component on the Whalers is the seat reinforcement, which ismadeoffiberglassreinforcedZyte,lathermoplasticresin. Block Island 40 The Block Island 40 is a 40 foot yawl that was designed by William Tripp and built by the American Boat Building Co. in the late 1950s and early 1960s. At the time of construction, the boat was the largest offshore sailboat built of fiberglass. Intended for transatlantic crossings, a very conservative approach was taken to scantling determination. To determine the damage tolerance of a hull test section, a curved panel was repeatedly run over with the designer’s car. The mat/woven roving lay-up proved adequate for this trial as well as many years of in-service performance. At least one of these craft is currently enjoying a second racing career thanks to some keel and rig modifications. Laser International Starting in 1973, Laser used a production line vacuum bag system to install PVC foam core (Airex , Clarke and Core-Cell). The same system has been used for the construction of over 135,000 boats. [1-7] Laser International invested $1.5 million in the development and tooling of a new, bigger boat, the 28 foot Farr Design Group Laser 28. The Laser 28 has a PVC foam core deck with aramid fabric inner and outer skins. A dry sandwich mold is injected with a slow curing liquid resin through multiple entry ports, starting at the bottom of the Figure 1-4 mold and working upward. [1-8] 4 14 Foot Laser Sailboat [Laser International]PDF Image | Marine Componsites
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