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A tumblewing is a glider or kite wing design which rotates about an axis traverse to the apparent wind, not necessarily horizontal. Tumble wings are frequently employed in wind turbines (type Savonius wind turbine). Tumble wings may be made of any material that supports some stiffness for form: paper, plastic, metal, composites, leaves, wood, etc. Many leaves falling from trees become tumble wing gliders. Its mode of flight is more akin to confetti than traditional fixed-wing aircraft; However, several model aircraft (see flettner airplane) have been built with tumbling wings for lift (force).〔( pg=PA1&dq=3380689&hl=en&sa=X&ei=KoR9UNGKBYbx0gGj64DIAw&ved=0CC8Q6AEwAA#v=onepage&q=3380689&f=false US Patent 3380689 ) Rudolph Bucher 1965 - "Stabilizing System for Aircraft"〕 Tumbling wings generate lift by alternately flying and stalling as the angle of incidence changes with the spinning motion (see magnus effect and flettner rotor). Because it has no need for ballast, the tumblewing design has a lower wing loading and makes a good walkalong glider which is easy to make and fly. The first example of a tumblewing flown as a walkalong glider appears in the book Fantastic flight. The Big Mouth〔(How to build and fly a Big Mouth type tumblewing )〕 is another example of a tumblewing design which can be flown as a walkalong glider. Tumble wings are employed as the wing of kite systems, a type of rotary kite, e.g. the rotor kite of Stephen Wingert taught in patent (US7621484 ), one of scores of such patents. == See also == * Gliding * Orographic lift * Slope soaring * controllable slope soaring * Human-powered aircraft 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「Tumblewing」の詳細全文を読む スポンサード リンク
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