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USA-17—a 90-foot-long (27 m) trimaran, type BOR90. A traditional paraw double-outrigger sailboat from the Philippines. A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams.
A multihull is a boat or ship with more than one hull, whereas a vessel with a single hull is a monohull. The most common multihulls are catamarans (with two hulls), and trimarans (with three hulls). There are other types, with four or more hulls, but such examples are very rare and tend to be specialised for particular functions. [1]
Chaparral Boats (originally Fiberglass Fabricators) was founded in 1965 by William "Buck" Pegg and Reggie Rose in Ft. Lauderdale, Florida. The company's bellwether boat at the time was the 15-ft Tri-Hull with a sticker price of $675. [1] Although the tri-hull was discontinued in the early 1980s, many remain in commission today.
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The hull and outriggers have nearly plumb stems and reverse transoms. The hull has a transom-hung rudder controlled by a tiller and a retractable daggerboard. It displaces 1,800 lb (816 kg) and carries no ballast. [1] [2] The beam is 17.92 ft (5.46 m) with the outriggers deployed and 8.17 ft (2.49 m) them folded. [1] [2]
The wing is more efficient than a traditional soft-sail rig setup. On November 10, BMW reported that they hit 32 miles per hour (28 kn) boat speed in a 10-knot (19 km/h; 12 mph) reported wind speed. [12] During the first race of the 2010 America's Cup, USA 17 was able to sail upwind faster than Alinghi 5 even without a jib.
The hull and the folding outriggers have nearly-plumb stems and reverse transoms. The main hull mounts a transom-hung rudder controlled by a tiller with an extension. It has foam flotation to make it unsinkable. The boat is normally fitted with a small outboard motor for docking and maneuvering. [1] [2]
The wave-piercing trimaran design allowed for improved speed and stability. The boat was fully submersible, able to cut through 15-metre (49 ft) waves and go 7 m (23 ft) underwater. [2] The hull was composed of a composite carbon fibre and kevlar with a non-toxic anti-fouling paint. [3]
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