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Flexible flyer : ウィキペディア英語版 | Flexible flyer
A flexible flyer or steel runner sled is a steerable wooden sled with thin metal runners. == Usage and Design ==
Flexible fliers are flexible both in design and usage. Riders may sit upright on the sled or lie on their stomachs, allowing the possibility to descend a snowy slope feet-first or head-first. To steer the sled, riders may either push on the wooden cross piece with their hands or feet, or pull on the rope attached to the wooden cross-piece. Shifting the cross-piece one way or the other causes the flexible rails to bend, turning the sled.〔(Samuel Leeds Allen patents the Flexible Flyer - Today in Philadelphia History )〕 Flexible flyers work best on hard packed or icy snow. If the snow is soft and deep, the sled's runners are likely to sink in and prevent the sled from moving.
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「Flexible flyer」の詳細全文を読む
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