| 摘要 |
An aerodynamic device having a concave-convex disk member with a rim and a substantially flat portion terminating in a downwardly curved portion adjacent the rim forming an upper convex surface with vanes on the disk to effect outward air flow in response to rotation of the device. A device with the disk having an air opening in the flat portion and a second disk member within the first disk member with the periphery of the second disk member adjacent and spaced from the rim with an air discharge aperture therebetween, said disk members having ribs therebetween for effecting air flow outwardly in response to rotation thereof for providing increased lift to the device.
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