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Wa are a traditional proa-style sailing outrigger canoe of the Caroline Islands. They have a single outrigger. ==Design and construction== ''Wa'' are proa — vessels with identical bow and aft, allowing the craft to reverse without turning. They are made from hewn-out hulls, typically breadfruit trunks, with single wide top-strakes, and carved head and stern pieces.}} Sails are lateen rigged}} and were traditionally made of pandanus mat sailcloth. Benjamin Morrell recorded in the 1830s that sails were "made in small pieces of about three feet square, sewed together. In cutting the sail to its proper shape, the pieces which come off one side answer to go on the other; this gives it the proper form, and causes the halliards to be bent on in the middle of the yard."}} After World War II sails switched to canvas, and after 1973 the use of dacron began to increase. Early accounts agreed upon "a lee-platform on the side opposite to the outrigger-frame, which also has a large platform of poles laid athwart its booms, whereon men are stationed to counterbalance any excessive heeling over toward the lee side when the wind increases in force". The windward float stabilizes the craft. This occurs "by its weight rather than its buoyancy. When the float becomes submerged in a wave its increased drag swings the canoe slightly around into the wind, thereby relieving some of the wind pressure on the sail. The canoe slows down temporarily and allows the float to rise again." This design feature also acts to reduce drift by tending to place the wind toward the beam or side of the craft. On Poluwat, the skill of canoe building is called ''héllap'' ("great rigging"), and different schools of canoe carpentry include ''hálinruk'' ("Rope of Truk") and ''hálinpátu'' ("Rope of the four Western Islands"). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wa (watercraft)」の詳細全文を読む スポンサード リンク
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