Consistently hitting the center of the golf clubface is very difficult.
In fact, about 95% of golfers typically make contact off-center. When this happens, the clubhead twists on impact, resulting in lost power and change in shot direction. Given this fact, it’s easy to understand the huge success of “game-improvement clubs,” designed with specific features to boost performance of irons, drivers, fairway woods, hybrids and putters.
How They Help You:
The most important factor of game-improvement golf clubs is greater MOI (Moment of Inertia). This MOI, or “resistance to twisting,” compensates for off-center hits. In club design, greater MOI is mostly achieved via a larger head size and distributing weight around the club’s perimeter. The objective is to lessen loss of power and accuracy when you miss the dead-center of the club face.
To better understand MOI and how it works, let’s take the example of two simple metal bars:
An object’s center of gravity will act as its natural axis of rotation (indicated above in red). If you push on a bar to rotate it, you will get more leverage (spin) when you are closer to the end of the bar. If you have a 6-inch bar and hit it 2-inches from center, you are making impact only one inch from the end of the bar. This gives you a large amount of leverage to spin the bar. On the other hand, if you push a 12-inch bar 2-inches from the center, you are making impact 4 inches away from the end of the bar. This reduces leverage and the amount the bar will spin.
Even though both bars are being pushed at a point 2-inches away from the center (axis), the longer bar gives us more distance between impact and the end of the bar, reducing leverage and spin. So, by increasing the length of the bar, we’ve reduced the amount of spin for an impact occurring 2 inches from center.
As you see, MOI is simply a matter of leverage. The more mass you place beyond the point of impact, the less the object will twist. So besides making the bar physically longer, this MOI affect can also be accomplished by distributing more of the bar’s weight to the ends; as seen below:
This is what makes a game-improvement club so forgiving on off-center hits; larger size and perimeter weighting. Any golfer can make good use of the benefits provided by game improvement clubs with high MOI.
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