| 摘要 |
<p>PROBLEM TO BE SOLVED: To produce an increase in spinning of a shot ball. SOLUTION: At least three golf clubs 2 of loft numbers (i=1-q) ranging from a gold club 2a of the lowest number (i=1) with the minimum loft angle and a golf club 2f of the highest number (i=q) with the maximum loft angle are combined as a set. The set includes a low number group G1 consisting of low number golf clubs 2a, 2b having loft angles of 27 degrees or less, a middle number group G2 consisting of middle number golf clubs 2c, 2d having loft angles of 27 degrees or more to 37 degrees or less and a high number group G3 consisting of high number golf clubs 2e, 2f having loft angles of 37 degrees or more. If the friction coefficient of the faces of the golf clubs included in the low number club group, the friction coefficient of the faces of the gold clubs included in the middle club group and the friction coefficient of the faces of the golf clubs included in the high number club group areμmi,μni,μoi, respectively, the relationship ofμoi>μni>=μmi is satisfied.</p> |
