| 摘要 |
PURPOSE:To achieve better controllability of shuttlecocks and higher repulsion property by constraining 'warping' even in collision of a racket with shuttlecocks while facilitating the generation of 'deflection' to the inside of a frame. CONSTITUTION:A racket frame is formed at a thickness of 11mm or more in the direction orthogonal to a face a framework 1 at the tip part 1A thereof and with a thickness of 14 mm or more at a joint part 1B with a shaft 2. A value of with/thickness, namely, a flatness ratio of the frame work 1 is set at 0.5 or less in the direction parallel to the face in the shape of cross section at parts thereof. |
