Clubhead size, weight and materials

The design of a clubhead is a balancing act. Designers have to exploit and manipulate its different characteristics to get an end result that works for golfers.

Two of the most important characteristics are the size of the clubhead and the distribution of weight within it.

Consider the clubhead on a driver, which is designed to help you strike the ball as far as possible down the fairway.

First cast your mind back to the days when tennis players used wooden racquets. Then along came the larger-headed versions, and suddenly everyone was using them. Why?

The larger surface area meant you had a better chance of hitting the ball in the “sweet spot”, the area where the bounce and impact with the ball was best for getting control and power on your shot.

The clubhead on a driver also has a sweet spot. The bigger the head, the more surface area (clubface) you’ve got to play with and the bigger this sweet spot.

Imagine a tiny clubhead on a driver - there’s no margin for error there. If you don’t hit the ball in the dead center of the clubface, you’re going to end up either missing entirely or you’re going to mishit the ball. With a larger face, your chances of a mishit are lower.

But it’s not quite that simple. First, the bigger the club, the heavier it becomes. If it becomes too heavy, it starts to become a problem for your swing.

But if you spread the weight out more and more thinly over a wider area, to gain size without adding weight, you end up with a weaker structure - and the clubface might not, for example, take all the pounding it gets.

Equally, having a larger clubface is fine, but if the head isn’t balanced correctly, then off-center hits will still produce bad results if it means, for example, the club twists too much. Or if all the weight is in the front of the club, then it’s harder to get the ball up into the air.

Now you see why clubhead design is a balancing act.

Manufacturers are always juggling size, weight and weight distribution to try and get a clubhead that lets you hit accurate, long shots as much as possible.

They’ve been helped in this regard by modern technology and materials. Titanium, for example, is very strong, but light.

Making the clubface out of titianium, rather than steel, means you can have the same strength, but without the weight. The weight you “save” (compared to a steel club face) can then be put in elsewhere to improve other club characteristics, like stability on off-center shots.

Recent years have seen the size of driver heads explode, because most of us simply aren’t accurate enough with our swings to always hit the ball with the center of the clubface. Bigger driver clubheads mean bigger sweet spots which mean less mishits.

However, the rulemakers have stepped in to draw up some limits. Partly to prevent technology removing the skill element from golf (by making it too easy to hit good shots), and partly to ensure clubheads retain a certain shape and form in the traditions of the game.

So, for example, for a driver’s clubhead to conform to the rules…

• it must not exceed a size (volume) of 460 cubic centimeters (plus 10 cubic centimeters tolerance).
• the distance from toe to heel must not exceed 127 mm, and must be greater than the distance from the clubface to the back of the clubhead.
• the distance from the sole to the crown must not exceed 71.12 mm

Of course, size and weight properties apply equally to other clubheads, such as those in irons. Unlike clubheads in drivers, however, the clubheads in irons are less about gaining strength and distance, and more about giving you accuracy and control.

So while the principles and characteristics are valid for irons, too, they’re not applied in quite the same way.

For example, a larger clubhead may prevent more mishits. But it’s harder to shape a shot with a larger head. There’s more of a tradeoff going on here than with drivers, and that’s why you don’t see massive iron heads on the fairways.

Traditional irons are of the blades variety. That’s exactly like it sounds; the iron clubhead is flat and relatively thin. This is great for flexibility in shotmaking - providing you can control the movement of the blade enough. That’s why tour pros use them.

A lot of golfers aren’t that proficient. They’re happy just to hit their shots straight. To help them, manufacturers developed “fatter” irons - so-called cavity-back irons.

These are much thicker than blades, with a wider sole. The sole improves the stability of the club as it moves through the stroke (particlarly as it moves along the ground). It also provides room for designers to focus weight at the bottom and back of the clubhead, and to increase perimeter weighting for even more stability.

These changes stabilize the club further, and shift the center of gravity to make it easier to get the ball up off the ground.