Golf Ball Dimples - The What and the Why?

▷▷▷Golf Ball Dimples - The What and the Why?

Dimples are the depressions on the surface of a golf ball; these depressions have a major effect on the trajectory and lift of ball flight, as well as the distance it travels.

The effects of dimples on the trajectory and distance of ball flight was discovered accidentally in the 1800s. Golf balls were originally manufactured with a smooth surface and no dimples. Golfers began to quickly realize that used balls with cuts, knacks, scrapes, and dents flew further and higher than newer, smoother ones. The first ball created with dimples was hand-crafted using a sharp edged hammer to create depressions with a consistent pattern; it was called the Hand Hammered Gutta-Ball.

Although the dimples on a golf ball range in size, shape, depth, and alignment, they all serve a common purpose to provide the golfer with a longer, higher, more predictable and controllable ball flight. Golf balls vary greatly from one manufacturer to the other. For example, Titleist has a different number of dimples for the Pro V1 (392), the Pro V1x (332), NXT Tour (332), but the alignment of the dimples for Titleist balls is a consistent pattern by the name of icosahedral. Dimples should be spaced evenly across the surface in recurring combinations of one shallow dimple and one deep dimple. The number of dimples on a regulation golf ball ranges from 300 to 500; the number of dimples does not directly correlate with the distance the ball travels. A ball with dimples can travel as much as three times as far as the same ball without these depressions.

The dimples reduce air resistance and increase the lift of the ball. By striking the ball, rapid backspin is created causing the airflow to downward and creating an opposite upward force that provides lift. The dimples of a golf ball create turbulence in the boundary layer. The thin layer of air surrounding a golf ball as it is launched through the air is referred to as the boundary layer. The dimples are used as buckets to scoop up air and move air towards the rear end of the ball. This process creates less drag by decreasing the amount of air pressure pulling backwards on the ball. The trajectory tends to rise with shallower dimples, while deeper dimples prevent the ball from rising as high.

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