| 摘要 |
<p>A racket frame for ball games such as tennis. The head (2) and shaft (4) preferably made of a hollow FRP material, have a uniform thickness along the longitudinal direction of the racket frame in a range from 23 to 28mm with a natural frequency in a range from 160 to 260 Hz. The specified natural frequency makes the vibratory performance of the racket frame very close to that of a ball just after striking so that the vibration energy of the racket frame can be efficiently utilized to accelerate the balls. <IMAGE></p> |
