Shaft set
A shaft set 2 S includes a first shaft SF 1 , a second shaft SF 2 shorter than the first shaft SF 1 , and a third shaft SF 3 shorter than the second shaft SF 2 . At least the second shaft SF 2 and the third shaft SF 3 each include butt partial bias layers s 3 and s 4 . Weights of the butt partial bias layers s 3 and s 4 are increased as the shaft is shortened. At least the first shaft SF 1 and the second shaft SF 2 each include tip partial bias layers s 10 and s 11 . Weights of the tip partial bias layers s 10 and s 11 are decreased as the shaft is shortened.
1. A shaft set for a golf club set, comprising:
a first shaft;
a second shaft shorter than the first shaft; and
a third shaft shorter than the second shaft, wherein
each of the first shaft, the second shaft and the third shaft includes a full length bias layer,
at least the second shaft and the third shaft each include a butt partial bias layer, and a weight of the butt partial bias layer is increased as the shaft is shortened in comparison among the first, the second and the third shafts,
at least the first shaft and the second shaft each include a tip partial bias layer, and a weight of the tip partial bias layer is decreased as the shaft is shortened in comparison among the first, the second and the third shafts,
the first shaft, the second shaft, and the third shaft have respective shaft weights of less than 60 g, and have respective shaft torques of less than 4 degrees,
a maximum value of the shaft weights is less than or equal to 1.10 times a minimum value of the shaft weights in comparison among the first, the second, and the third shafts,
the first shaft has a length of longer than or equal to 928 mm and shorter than or equal to 991 mm,
the second shaft has a length of longer than or equal to 885 mm and shorter than 928 mm,
the third shaft has a length of longer than or equal to 860 mm and shorter than 885 mm,
the full length bias layer has a tip end width Ht, and
the tip end width Ht is increased as the shaft is shortened in comparison among the first, the second, and the third shafts.
2. The shaft set according to claim 1 , wherein
at least the second shaft and the third shaft each include a butt partial straight layer, and a weight of the butt partial straight layer is increased as the shaft is shortened.
3. The shaft set according to claim 2 , wherein
the butt partial straight layer includes a glass fiber reinforced layer, and
a weight of the glass fiber reinforced layer is increased as the shaft is shortened.
4. The shaft set according to claim 1 , wherein a maximum value of a weight of the full length bias layer is less than or equal to 1.10 times a minimum value of a weight of the full length bias layer in comparison among the first, the second and the third shafts.
5. The shaft set according to claim 1 , wherein the first shaft does not include the butt partial bias layer.
6. The shaft set according to claim 1 , wherein the third shaft does not include the tip partial bias layer.
7. The shaft set according to claim 2 , wherein each of the first shaft, the second shaft, and the third shaft includes the butt partial straight layer, and the weight of the butt partial straight layer is increased as the shaft is shortened.
8. The shaft set according to claim 1 , wherein the maximum value of the shaft weights is less than or equal to 1.05 times the minimum value of the shaft weights in comparison among the first, the second, and the third shafts.
9. The shaft set according to claim 1 , wherein
the full length bias layer has a butt end width Hb, and
a ratio (Ht/Hb) is increased as the shaft is shortened in comparison among the first, the second, and the third shafts.
10. An iron type golf club set using the shaft set according to claim 1 , comprising:
a first golf club to which the first shaft is attached;
a second golf club to which the second shaft is attached; and
a third golf club to which the third shaft is attached, wherein
the first golf club has a loft angle of greater than or equal to 15 degrees and less than or equal to 28 degrees,
the second golf club has a loft angle of greater than 28 degrees and less than or equal to 42 degrees, and
the third golf club has a loft angle of greater than 42 degrees.
11. The iron type golf club set according to claim 10 , wherein
the first golf club is a 5-iron,
the second golf club is a 6-iron, a 7-iron, an 8-iron, or a 9-iron, and
the third golf club is a pitching wedge.