| 摘要 |
PROBLEM TO BE SOLVED: To provide a racket frame which is easily swingable through, is excellent in operability and ensures a stable shot of a ball even when the ball is hit off a sweet area in hitting the ball. SOLUTION: The mass before spreading of gut of the racket frame 1 ranges from 150 to 200 g and the inertia moment 1x in the swing direction around a point P of 80 mm from a grip end as the axis of rotation is designed to 0.018 to 0.023 kg.m2. The inertia moment 1y around the axis 14 in the longitudinal direction of the racket frame 1 is set at >=0.032 times and <0.040 times the inertia moment 1x in the swing direction in the case of the racket frame 1 constituted to have a ball hitting area of 516.1 to 580.6 cm2 and is designed to >=0.035 times and <0.045 times the inertia moment 1x in the swing direction in the case of the racket frame 1 constituted to have the ball hitting area of 612.9 to 709.7 cm2. |
