What Are the Indentations on a Golf Ball Called?

Those little indentations covering a golf ball's surface are called dimples. Far from being a simple design choice, these carefully engineered pits are responsible for a golf ball's ability to fly far and straight through the air. This article will explain exactly why dimples are so important, how they work, how their design has evolved, and what it all means for your game on the course.

The Official Name: Welcome to the World of Dimples

There's no secret term or technical jargon here - the indentations are, quite simply, called dimples. But while the name is straightforward, their function is one of the most brilliant pieces of engineering in all of sports. Without them, the game of golf would look completely different. A modern professional golfer can launch a drive over 300 yards, a feat made possible almost entirely by the aerodynamic properties of these dimples. A perfectly smooth golf ball, struck with the same force and precision, would struggle to travel even half that distance. The dimples are the true engine of golf ball flight.

Why Do Golf Balls Need Dimples? A Quick Physics Lesson

To understand why dimples are so effective, we need to talk a little bit about aerodynamics, specifically two opposing forces: drag and lift. On the golf course, you want to reduce drag as much as possible and maximize lift. This is exactly what dimples are designed to do.

The Problem with a Smooth Ball

When an object flies through the air, it has to push the air aside. With a smooth ball, the air separates from the surface early, creating a large, chaotic pocket of low-pressure air behind it. This pocket is called a "wake." Think of it like the large wake behind a slow-moving boat - it creates a powerful suction effect that pulls backward on the ball, slowing it down immensely. This pulling-back force is known as drag. A smooth golf ball is aerodynamically inefficient because it creates a huge amount of drag, robbing it of speed and distance.

Here’s a simple stat to put it in perspective: a drive from a top player might have a ball speed of around 180 mph. With a smooth ball, that speed would drop off so quickly due to drag that the ball would tumble out of the sky after about 130 yards.

The Genius of Dimples: Reducing Drag

This is where things get interesting. You might think that a rough, dimpled surface would create more friction and slow the ball down, but the opposite is true. The dimples work by creating a thin, controlled-chaos layer of turbulent air that "hugs" or sticks to the golf ball's surface for longer. Kind of like wrapping the ball in a tiny, invisible air blanket.

Because this turbulent layer follows the ball's contour further around its back side, it dramatically reduces the size of that low-pressure wake. a smaller wake means far less suction pulling the ball backward. Dimples effectively cut the drag on a golf ball by about half, allowing it to maintain its velocity for much longer and travel incredible distances.

Generating Flight: The Power of Backspin and Lift

While reducing drag is one half of the equation, the other is creating lift. This is where backspin comes into play. When you strike a golf ball correctly, it launches with a high rate of backspin.

As the dimpled ball spins backward while moving forward, it manipulates the air flowing around it. The top of the ball is moving against the direction of airflow, while the bottom of the ball is moving with it. The dimples grip the air in such a way that it causes the air to move faster over the top of the ball. According to a principle in physics known as Bernoulli's Principle, faster-moving air has lower pressure.

This creates a pressure differential: high pressure under the ball and low pressure above it. The high-pressure air below pushes the ball upward, creating an aerodynamic lifting force that fights against gravity. This lift is what gives a golf ball its beautiful, soaring trajectory, allowing it to hang in the air for much longer than an object simply thrown or launched without spin.

The Evolution of the Dimple: From `Featheries` to Modern Science

The discovery that indentations help a golf ball fly better was actually an accident. The first few hundred years of golf were played with "featherie" balls - leather pouches painstakingly stuffed with goose feathers. These balls were perfectly smooth when new, but golfers began to notice something odd: their older, scuffed-up featheries with nicks and cuts on their surfaces actually flew farther and truer than pristine new ones. This was the first, unwitting discovery of aerodynamics in golf.

The `Guttie` and Intentional Patterns

In the mid-1800s, the "gutta-percha" ball (or `guttie`) was introduced. Made from the dried sap of a Malaysian tree, these balls were easy to mass-produce and could be reshaped when damaged. Initially, they were also sold as smooth spheres. But players and manufacturers, remembering the lesson from the featheries, soon began adding patterns to them intentionally. At first, they were scored with lines, but the most popular early pattern was hammered by hand, creating a random dimple pattern.

Later, molds were created with inverse patterns, often with raised bumps instead of indentations. This style was called the "bramble" pattern, because it looked a bit like a berry. Both hammered and bramble balls proved far superior to smooth ones, confirming that a textured surface was necessary for flight.

The Modern Era of Scientific Design

The invention of the modern wound-rubber-core ball around 1900 coincided with the adoption of the dimple as we know it today. The first machine-made balls featured standardized dimple patterns, and from there, the science exploded. Today, golf ball companies employ teams of aerospace engineers and use supercomputers and wind tunnels to fine-tune every aspect of a dimple's design.

• Dimple Number: Typically between 300 and 500. It’s not about cramming as many as possible, it’s about optimizing surface coverage and the aerodynamic interaction between them.
• Dimple Shape: No longer just simple circles. Modern dimples can be ovals, teardrops, or even complex hexagonal shapes inside of other patterns. TaylorMade's hexagonal dimples, for instance, are designed to create a more stable flight.
• Dimple Depth and Edge Angle: The steepness of a dimple's edge and its depth have a massive impact on the ball's launch and flight. Deeper dimples can help create a higher-launching, higher-spinning flight, while shallower patterns often produce a lower, more penetrating trajectory.

Does the Number and Shape of Dimples Actually Matter?

Absolutely. The variety in dimple patterns you see on store shelves is not just for marketing. It’s how manufacturers fine-tune a ball's performance to suit different players and swing types. The dimple pattern works in concert with the ball’s core (the engine) and cover (which controls feel and spin) to deliver a specific set of flight characteristics.

A Few Examples:

• A ball designed for maximum distance will often have a shallower dimple pattern. This helps produce a lower-spinning, more penetrating flight that gets a lot of roll-out after it lands, perfect for players looking to squeeze out every possible yard.
• A ball designed for tour-level control and spin might feature deeper, more aggressive dimples. These help generate higher spin rates, allowing for a trajectory that stops quickly on the greens - a must for approach shots.
• Balls designed for straighter flight might use patterns that are specifically engineered to reduce side-spin, helping to mitigate the effects of a slice or hook for the average golfer.

So, when you see a company advertising a "new dimple pattern," it's not just talk. It represents thousands of hours of research and development aimed at creating a ball that launches higher, spins less, cuts through the wind better, or flies straighter.

How Dimples Affect Your Game on the Course

As a coach, I'm often asked how technical details like dimple patterns translate to actual performance where it counts - on the scorecard. You don't need to be an engineer to appreciate the effects. Here’s how dimples directly influence your shots.

1. Better Performance in the Wind

This is a big one. An aerodynamically efficient golf ball is far more stable in windy conditions. A well-designed dimple pattern helps the ball hold its line in a crosswind and prevents it from "ballooning" or climbing too high when hitting into a headwind. This stability translates to more predictable distances and more confidence over the shot.

2. Optimizing Your Trajectory

Does your natural shot fly too low? A ball with a dimple pattern designed for a high launch can help you get the ball airborne more easily, which can add significant carry distance, especially for players with slower swing speeds. Conversely, if you hit the ball too high and lose distance into the wind, a ball designed for a lower, more penetrating flight can make a massive difference.

3. The Foundation of All Distance

At the end of the day, distance is a combination of ball speed, launch angle, and spin. Dimples are the "secret sauce" that allows the whole thing to work. By fighting drag and promoting lift, they ensure that the energy you transfer to the ball at impact is translated into maximum carry and overall distance. Every single yard you get with your driver over that old 130-yard smooth ball is a direct gift from the dimples.

Final Thoughts

So, those little indentations on your golf ball are called dimples, and they are one of the most remarkable innovations in sports science. By simultaneously reducing drag and working with backspin to create lift, they transform an unhittable, short-flying sphere into a technological marvel that can soar hundreds of yards with precision and grace.

While understanding golf ball physics is fascinating, applying that knowledge in tricky situations on the course is a whole other challenge. That’s where a tool like Caddie AI comes in handy. It takes the guesswork out of your real-world decisions by giving you simple, clear strategic advice for every shot. If you're stuck behind a tree or facing a toughwind, you are not focused on dimple patterns, you are focused on what shot to hit next. Instead of getting bogged down in theory, our app an give you an expert second opinion right there, helping you choose the smartest play and swing with confidence.