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leeboard
A leeboard is a lifting foil used by a sailboat, much like a centerboard, but located on the leeward side of the boat. The leeward side is used so that the leeboard is not lifted from the water when the boat heels, or leans under the force of the wind.
==History==
Leeboards existed in China from at least the eighth century on warships that "held the ships, so that even when wind and wave arise in fury, they are neither driven sideways, nor overturn".〔 cited by〕 Leeboards used to stabilize the junk and to improve its capability to sail upwind, are documented from a book by Li Chuan. The innovation was transmitted to Portuguese and Dutch ships around 1570.〔Donald F. Lach. (1977). (''Asia in the making of Europe. Volume II, A Century of Wonder'' ). p. 403.〕 "The Portuguese experimented with caulking their vessels in the Chinese manner and the Dutch probably added leeboards to their craft that were copied from Chinese models."〔Donald F. Lach. (1977). (in the making of Europe. Volume II, A Century of Wonder'' ). p. 403.〕
Leeboards have been used by relatively large inshore sailing vessels used for transport since 1570, such as Dutch barges and Thames barges. For these boats, leeboards provided the advantages of shallow draught for working close inshore and an unobstructed hold for cargo. They were also easier to build than a large centreboard would have been.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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