| 摘要 |
<p>A tubular blank for producing golf club shafts comprises a butt section having a uniform cross-sectional configuration along its length, a tip section also having a uniform cross-sectional configuration along its length, and a tapered section interconnecting the butt and tip sections. Metallurgically formed rifling on the interior surface of the blank extends throughout the entirety of the butt, tip and tapered sections. The golf club shafts produced from these blanks have increased strength and stiffness which is a direct result of the interior rifling. A set of golf club shafts preferably is produced from a group of these tubular blanks with each blank of the group having the same length and the same natural frequency. Predetermined portions are then selectively removed from the tip and butt sections. The ultimately produced golf club shafts are frequency matched along a predetermined gradient and each shaft of the set has a predetermined stiffness distribution along its length directly related to the stiffness distribution of the other shafts of the set.</p> |
