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A tethered balloon is a balloon that is restrained by a cable attached to the ground or a vehicle and so cannot float freely. The tether is attached to a winch which is used to raise and lower the balloon. A balloon is a form of aerostat, along with the powered free-flying airship, although the American GAO has used the term "aerostat" to describe a tethered balloon in contrast to the airship. Tethered balloons have been used for a variety of purposes, including: *Observation balloons *Barrage balloons *Advertising and other graphical displays *Instrumentation or communications equipment platforms, for civil or military use * Recreational flights ==Design principles== A tethered balloon may take any of three basic forms: * An elongated (airship or blimp-shaped) balloon with fins at one end to stabilise it so that it always points into the wind. * A simple round balloon, without stabilisation. * A hybrid tethered balloon or kytoon uses a combination of aerostatic buoyancy and aerodynamic lift similar to a kite. 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「tethered balloon」の詳細全文を読む スポンサード リンク
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