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US 2003/0119415 A1Published application
Flying disc
AssigneeEntercom Inc. Oy
InventorJukka Kaisio
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AssigneeEntercom Inc. Oy
InventorJukka Kaisio
Estimating the term…
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.
A returning flying disc comprising a lower wing [1], an upper wing [2] of smaller diameter mounted axially, and between these an axle [3] connecting the wings perpendicularly with a clearance between them, and a string [4] or corresponding part that is attached to the axle [3] and that can wind around this axle so that when allowed to fly the flying disc returns as the string winds back into the free space between the wings, characterized in that the lower wing [1] has at least one circular airfoil [11] generating lift on horizontal flight, and that there are openings within the area bounded by the inner edge of the circular airfoil [11] and the axle [3], so that the air-currents from the direction of flight that pass over and under the airfoil [11] are able to mix through these openings.
A flying disc according to any of the foregoing claims, characterized in that the upper surface of the hub area [13] of the lower wing [1] and the bottom surface of the hub area [23] of the upper wing [2] are the main joining area of the said wings.
Dependencies are inferred from the claim text.