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A power kite or traction kite is a large kite designed to provide significant pull to the user. They come in three main forms: foils, leading edge inflatables and supported leading edge. There are also rigid-framed kites and soft single skin kites. There are several different control systems used with these kites which have two to five lines and a bar or handles. Most foil kites are made for use on land as they are "opened celled" so air flows in and out easily; this can be used as a safety feature to depower the kite. There are a few exceptions for this with new foils that use closed cell technology; they float on the water while you relaunch. Power kites are generally used in conjunction with a vehicle or board, such as in: * kitesurfing on a kiteboard * kite buggying on a purpose-built 3-wheeled cart * kite jumping, using a power kite for jumping above the ground * kite landboarding on an all-terrain/mountain/land board * kite skating on all-terrain roller skates * kiteboating, on a boat * man lifting, where a harnessed kite flier is moored to the ground or one or more people to provide tension and lift * snowkiting on skis or snowboards Research is also under way in the use of kites to generate electric power to be fed into a power grid. Laddermills are a type of airborne wind turbine. Kites are used to reach high altitude winds such as a jet stream, which are always present, even if ground level winds available to wind turbines are absent. Kites of related design are used for sailing, including speed sailing. ''Jacob's Ladder'', a kite-powered boat, set the C-Class world sailing speed record with a speed of in 1982, a record that stood for six years. A kiteboard was the first sailing craft to exceed a speed of in October 2008.〔 Power kites range in size from . All kites are made for specific purposes: some for water, land, power or maneuverability. ==See also== *Kite types *Kite applications *Kite mooring *SkySails - industrial-scale power kites for pulling ships 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「power kite」の詳細全文を読む スポンサード リンク
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