| 摘要 |
<p>PURPOSE:To get rid of a flying performance difference which is caused by the difference of a golf club shot position, at a golf ball on whose spherical surface dimples and a great circle passage that does not cross with dimples, are, by dividing a golf ball spherical surface sphere into a great circle passage vicinity sphere and the other sphere than this, and improving dimple volumes at respective spheres. CONSTITUTION:A dimple sphere where a volume is sized so that a flying performance in the case of a seam shot or a semi-seam shot in which a great circle passage consisting of a seam or a semi-seam coincides or almost coincides with a back spin peripheral speed fastest part, may become approximately equivalent to a flying performance in the case of a non-seam shot in which the great circle passage does not coincide with the back spin peripheral speed fastest part, is selected. A VL/VF volume ratio is 1.02<=VL/VF<=1.20. In the case of 1.02 or less, a semi-seam shot dimple effect is not sufficiently improved. In the case of 1.20 or less, the dimple effect becomes too large, and conversely, a trajectory becomes higher than the.</p> |
