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What is the Moment of Inertia in golf clubs and how does it affect performance?

When youā€™re shopping for second hand golf clubs online, thereā€™s a lot to consider. Of course, youā€™ll have your favourite, go-to golf brands to browse, but beyond that there is a whole host of technical specifications that are worth paying attention to. One of the biggest ones is the loft and lie of a club, and youā€™ll be glad to know that weā€™ve already covered that in plenty of detail in our essential guide to golf club loft and lie. Then, youā€™ll want to consider the shaft length and whether you need a right or a left-handed golf club.

BUT WHAT ELSE DO YOU NEED TO CONSIDER?

When golfers are analysing the tiny adjustments they can make to their selection of golf clubs, there are two details that are worth learning more about. One of them is the Centre of Gravity of the clubhead. And, youā€™ll be pleased to know that you can find out more about that in our article telling you everything you need to know about the Centre of Gravity (CG, or CoG) of a golf club.

The other detail to swot up on is the Moment of Inertia (MOI), and thatā€™s what weā€™re focusing on in this article. Yes, itā€™s physics, but youā€™ll be amazed at how big a part that has to play in finessing your golf technique. Weā€™ll call it MOI from now onā€¦

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SO, WHAT IS MOI?!

In mechanical engineering, Collins Dictionary says, ā€œThe moment of inertia of the cross-section of a body is its resistance to changes in its rotation. It depends on how far each part of the body's mass is from its center.ā€

But weā€™re not mechanical engineers, weā€™re golfers, so let's look at what that means for us and our golf clubs in simpler terms. In golf, MOI refers to the golf clubā€™s resistance to twisting when it hits the golf ball. The rule of thumb to remember is the higher the MOI, the more resistant it will be to twisting during a swing.

WHAT MOI SHOULD I LOOK FOR IN A GOLF CLUB?

Taylormade TP reserve putter

WHAT MOI SHOULD I LOOK FOR IN A GOLF CLUB?

If youā€™re a relative beginner looking for stability and forgiveness, youā€™ll want to find a golf club with a higher MOI. If youā€™re a higher handicapper and all about workability and control, straightness and distance, then you need a lower MOI (but youā€™ll have to compromise on the amount of forgiveness it allows). MOI is increased in a golf club by distributing the weight around the edge of the clubhead.

As with all things in golf, itā€™s as much about trial and error as it is knowledge and technique, so the best way to find out what MOI is right for you is to experiment with a wide range of golf clubs.

MOI IN DIFFERENT TYPES OF GOLF CLUBS

Golf drivers are one of the most important clubs in your bag, designed for distance (and therefore more prone to mishits). So, youā€™re looking for a higher MOI here that can reduce any twist incurred by an off-centre shot. When it comes to irons, higher MOI models are usually cavity-backed with a distributed weight around the clubhead to give your club a bigger ā€˜sweet spotā€™ and improve the quality of your shot. As for putters, you may be surprised to learn that MOI is still important. Again, a higher MOI will give you more forgiveness and mallet putters are good for this because of their larger heads and perimeter weighting.

IN SUMMARY

Generally speaking, less experienced, higher handicappers should look for clubs with a high MOI. More proficient players with lower handicaps can afford to experiment with a lower MOI in their club. You wonā€™t find an actual figure for your clubā€™s MOI when youā€™re browsing for used golf clubs, but you can research the model to find out if itā€™s got a low or a high MOI to help you make your decision.

We hope youā€™ve found our guide to Moment of Inertia (MOI) in golfing useful. Let us know if you have any questions!

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