| 摘要 |
<p>An improvement to a flying disc that returns to the user by means of a string using rotational energy in a manner of a yo-yo. The flying disc may be used as a toy, for recreational purposes and as sporting equipment. It has a lower wing (1) generating lift, a smaller upper wing (2), an axle (3) between these, and a string (4) attached to the axle (3). A flying disc constructed according to the present invention has at least one circular airfoil (11), and there are openings inside the area bounded by its inner edge and the axle (3). Air-currents from the direction of flight that pass over and under the airfoil (11) are able to mix effectively through these openings. When slung with the string (4) the flying disc starts to rotate rapidly and flies away. It returns to the user when winding the string (4) back in the manner of a yo-yo.</p> |
