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Abstract

Provided is a flight device which can utilize headwind and following wind, respond flexibly to changes of wind directions and travel stably. The flight device includes a main body with an air sac. It also includes a forward air resistance changing unit and a backward air resistance changing unit that lies anterior and posterior to the main body in traveling direction, respectively. They are controlled by a controller to change air resistance. As a result, the flight device can travel stably despite wind direction. The flight device further includes a wing tilted vertically which provides driving force without gasoline engine. The driving force is gained from vertical wind caused by changing altitude using air sac. Further, the flight device can select the route toward the destination based on the prediction of changes of winds by prediction device.

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First Claim