What Are the Small Dents on a Golf Ball Called?

The small dents covering your golf ball are called dimples, and they are far more than just a quirky part of the golf ball design – they are the powerful secret sauce to sending it soaring down the fairway. In this guide, we'll cover what dimples are, the fascinating science of how they work, and a bit about the history behind the idea. Most importantly, you will understand how they directly influence your ball flight and how knowledge of them can help to improve your game.

The Science of Flight: Why Do Golf Balls Have Dimples?

You may be surprised to hear that a completely smooth golf ball, when struck by a professional golfer, would only travel about half as far as a modern-looking dimpled ball. Why is such a small design element responsible for so much power and air-time? It's really an elegant piece of engineering and aerodynamics, but it's something that a normal everyday golf player can understand.

The two enemies to your golf ball flying toward the target are drag and gravity, and the magic of dimples helps to tackle one while boosting the lifting motion on the other. Here’s a bit of insight on how these work in tandem with each other on the way down the fairway.

Reducing Drag with a "Boundary Layer"

Imagine pushing a completely flat paddle through the water, as opposed to one shaped like the hull of a racing boat... a flat surface creates far more resistance on its way through the water. Aerodynamics work the same way. Whenever an object travels, there will be a pocket of low pressure behind it where the air rushes to occupy that vacant area. This is also called a "wake," and the suction of the air in the path of the ball will slow it down - also known as pressure drag.

Here’s where dimples come into play. As a dimpled golf ball spins backwards after being hit:

• The dimples catch the air and create a very thin layer of turbulence around the golf ball's surface.
• This thin turbulent buffer of air is known as the turbulent boundary layer, and it clings tightly to the ball's surface much further around the back side so smoothly that the golf ball's wake becomes much smaller.
• Because the back of the golf ball's wake has now shrunk compared to a normal ball, the pressure drag factor that existed before has become much smaller, slowing the golf ball down less so it shoots through the sky much further than a smooth one could go, as it stays going faster for much longer.

In less complex terms: the dimples "scuff up" the air's path, tricking it into creating a cozy "air blankie" for the ball, which presents a much narrower profile moving through the windy expanse to reduce the drag on its path and to continue on toward its destination with all due speed. Dimples increase the aerodynamic lift on a golf ball by as much as half the distance traveled by a smooth counterpart, which means that you get a much better total distance, with no change to the power of your swing at all.

Creating Lift Through Spin

Dimples not only reduce what slows a ball down - they actually help to keep it aloft in the air. This occurs as a beautiful interplay involving backspinning, a phenomenon called Bernoulli's Principle, and dimples.

As every golfer learns: for a crisp iron shot, the club striking down and through the ball will make it backspin into the air. Here's what's going on:

1. The spinning dimples drag air up around the top of your golf ball. This causes the stream over the top to travel faster, creating a pressure differential that produces lift on your shot.
2. Since pressure on the lower half of the ball is then significantly lower, the pressure differential between top and bottom creates lift (think airplane wing). This forces the ball up.
3. Without the thin turbulent boundary layer from dimples, there would be too little friction holding air around your ball, creating no effective way for the spin to work its lift properly.

To cut to the chase, this means a dimpled ball gets significantly more carry and stays airborne for longer, giving you the classic high-arcing golf shot we're all familiar with. Combining both a diminished drag force and a more assertive lift makes for greater distances, allowing players of all ability levels to get the ball far down the fairway on their big drives.

From Smooth Accident to Engineered Perfection: A Brief History

The use of dimples on a golf ball wasn't an immediate breakthrough. For hundreds of years, golf enthusiasts had a rough idea that battered, scarred golf balls seemed to have a superior feel. Still, they had yet to find a direct way of manufacturing the design.

The earliest golf balls in the 17th century were so-called "featheries" - hand-stitched leather pouches filled tightly with boiling wet goose feathers. They took on a slightly bumpy look when they lost moisture. Yet no one saw why, at any rate, the first smooth golf balls that didn't go so well, which came from the Gutta Percha, were molded sap shaped into spheres. The sap's texture seemed to give the ball its own distinct spin in an unusual way for the old smooth surface.

At some point, a new style being seen in London became popular. In Gutta Percha, golfers noticed scarred, battered balls actually performed better, and players started deliberately battering the new balls that their shots had already marred a little so they would go on for longer stretches!

Finally, in the early 20th century, innovators like William Taylor formalized the bumps into a dimple-like pattern. This gave them a way of consistently creating the design for longer, deeper cuts that improved flight performance from these little pieces of rubber or soft plastic. Today's golf ball construction involves a number of dimples ranging from around 300 to over 500 in various arrangements! The number of dimples is not constant, offering more options about size, form of cut, and shapes, with each ball produced being carefully designed for well-defined ball flight.

Not All Dimples Are Created Equal

Walking down your neighborhood pro shop's golf ball section, you'll see a huge number of styles and designs populating the racks. Manufacturers have designed each for slightly different types of golfers, catering to varying characteristics they want in their shots - from low spin, tour-level performance with fast ball speeds all the way down to smooth drives off the tee! The following are three dimple design factors that companies consider to give players those subtle advantages off the tee:

• Number of Dimples: Modern-day balls have approximately 300 to over 500 dimples. No magic number applies here, instead, their positioning matters more!
• Shape and Size: Dimples come in circular shapes and now include hexagonal and multi-faceted patterns to interrupt flight patterns. The size, depth, and edge radii all affect performance - a large change for what often appears to be simply decorative design.
• Pattern: The way dimples are arranged defines much of their overall aerodynamics, influencing whether they give a high-launching, low-spinning distance or high spin, tour-level control.

How a Dimple Affects Your Choice

Knowing this information allows you to have a little shopping expertise on your next golf pro shop stroll. Understanding how each type may shape and spin your shots can provide that extra edge to improve your golf scores!

• High Trajectory Balls: Balls aimed to promote a higher launch will use shallow dimensions of greater diameter, enhancing both wind flow control and spin. This can assist players with moderate swings achieve greater distances with sharper curves in certain conditions.
• Low Trajectory Balls: Conversely, balls designed for lower and more piercing flight angles will have smaller, deeper dimples. They reduce lift, offering enhanced performance in wind, while enabling the ball to roll further upon landing.

Your Game's New Best Friend? The Dimple

The dimples covering your golf ball are far more than simple decoration. These wonders of aerodynamic technology are key to modern golf, significantly affecting a player's game. Here are two immediate steps to start improving today:

A clean ball flies consistently. Any debris filling the dimples reduces performance. Have a clean towel or ball cleaning equipment ready to ensure predictability on each shot. This makes every shot count more, flying true and far.

Final Thoughts

The tiny indents on a golf ball, called dimples, demonstrate how small details can lead to huge changes in performance. By creating a turbulent layer of air, they strategically reduce drag and enhance lift, allowing for powerful, arcing shots characteristic of modern golf. The specific number, shape, and pattern of these dimples are carefully engineered to fit different types of players and swing speeds.

Understanding the physics of why your ball flies a certain way is a big step, but applying that insight on the course during a real round is what truly makes a difference. To bridge that gap, I've designed Caddie AI. When you're facing a tough approach shot over a bunker on a windy day, it can be hard to decide which ball characteristic - lower-spinning or higher-spinning - is your friend. You can describe the situation to the app and get an expert-level recommendation in seconds, giving you that extra layer of confidence to commit to your shot and execute it flawlessly.