A flying toy called Aerobie r was invented by Adler in the US. The flight range of the toy is rather enormous, and it is one of the Guinness book world records. The authors were interested in the aerodynamic characteristics of the toy, and experimentally investigated annular plan form flat plates from which the toy was developed. It was found that L/D was improved and the center of pressure moved toward the center of gravity as the inner radius was increased.

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