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Gear Effect: Controlling your driver

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More than 10 years ago at a university lecture on materials science, it finally dawned on me.

[quote_box_center]“Ah, that’s why a driver is so much more chaotic.”[/quote_box_center]

Last week, I discussed the twisting of the club head on off-center hits, as well as how this causes something called “gear effect.” This week, we are going to understand why a driver can be so infuriatingly difficult to control. It might also explain why you get different results with your irons compared to your woods.

Location, location, location

Where the center of mass of a club is situated is massively influential on the amount of gear effect produced. To help you understand the concept, let’s examine the illustration below.

Photo 1

The illustration shows a “toe hit.” The center of mass (pink gear shape) is traveling along the pink line (swing path). The ball is struck on the toe of the club, and this creates a twisting of that contact point around the center of mass. In other words, the yellow line will twist in the direction of the blue and white arrow, similar to a clock going from 1 o’clock to 3 o’clock.

As the club rotates along the blue part of the arrow, the contact point on the club face will travel more to the right before traveling increasingly more backward (and less rightwards) as it moves along the white part of the arrow.

The bluest part of the arrow (the part where the contact point is shifting more rightwards) is where the most gearing occurs, applying an opposing twist to the ball. So, as the club face opens up clockwise, the ball will rotate counter-clockwise.

Remember that the exact opposite twisting of the clubhead and ball occurs on a shot contacted on the heel of the club.

Iron it out

With an iron, the center of mass is much closer to the face than with a metal wood, so the twisting at impact can produce a different result.

A similar scenario to our driver shot is illustrated below.

Photo 2

The iron is traveling along the pink line and when the ball is hit on the toe of the club, it produces a clockwise twisting of the club face. We can see from the blue-and-white arrow, however, that the iron will behave more like a screen door — rotating nearly straight back with almost no rightward movement of the contact point on the face.

There’s still a little rightward movement, of course, but nowhere near as much as with a driver. As a result, gear effect is minimized and can be overridden by the opening of the face.

Bulge

Have you ever wondered why the face of a driver is not completely flat? Take a look at your driver now, and you will see that it is slightly convex — something called “bulge.” This was introduced first by Spalding decades ago, and is a way of counteracting gear effect.

With a perfectly flat club face, a toe hit would produce an insane amount of gearing, launching the ball with a lot more hook spin (or less slice spin) than it would have otherwise. By adding bulge, toe hits start more to the right (for a right-handed golfer) and heel hits start more to the left. This gives golfers of all levels a much better chance to hit the fairway when they don’t hit the ball exactly on the sweet spot — which by the way almost never happens, even for the best golfers in the world.

Take action

The first thing to realize with all of this is that a driver is going to be far more difficult to consistently control simply because strike location plays such an important role in direction.

With that said, you should never underestimate the power of simple drills, such as using the dry erase marker, foot spray or face tape to identify your strike location. I see so many golfers hit a heeled slice with the driver and then try and fix their swing path when it was never the issue in the first place.

If you can get better at identifying whether a strike was heeled or toed, as well as improve your ability to hit the desired location, you will see far more consistency in your game.

Here is a simple exercise which can help with the awareness element.

  • Place a dot on the back of the ball with a dry erase marker pen.
  • Hit the shot.
  • Based on the sound, feeling of twisting and the ball flight, try to guess where you hit the club face (too high/low, too heel/toe).
  • Take a look and see how close your guess was to reality.

I have found a clear correlation between a player’s ability to identify where they hit on the club face and their handicap level. I have also seen simple improvements in awareness create lowered handicaps.

Editor’s Note: Adam is Author of the amazon bestseller “The Practice Manual,” where he discusses some of these concepts and more. You can purchase the book here.

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Adam is a golf coach and author of the bestselling book, "The Practice Manual: The Ultimate Guide for Golfers." He currently teaches at Twin Lakes in Santa Barbara, California. Adam has spent many years researching motor learning theory, technique, psychology and skill acquisition. He aims to combine this knowledge he has acquired in order to improve the way golf is learned and potential is achieved. Adam's website is www.adamyounggolf.com Visit his website www.adamyounggolf.com for more information on how to take your game to the next level with the latest research.

18 Comments

18 Comments

  1. Todd

    Oct 27, 2015 at 2:22 am

    Who says gear effect is a bad thing?

  2. Jim Maron

    Sep 30, 2015 at 2:44 pm

    I pretty much know where I’ve hit a ball on the face by the feel. You can also tell how well your hitting it as the clubs get older…how small is the circle of wear on the face and where is it relative to the sweet spot.

    Saw an article once the showed the wear circles for a pga tour pro, a scratch and various handicaps 10 to 30….the smaller the circle the better the golfer.

  3. marcel

    Sep 28, 2015 at 9:13 pm

    knowing why you shanking wont help you to improve it – not in golf. yes its good to know why but… without a coach you not gonna be able to fix this 0.5cm difference. thats why the pros have coaches on their bags and during season and off season.

    also the proper fitness – you might have the best coach ever but… if you legs and lower back are not strong and conditioned you fade / you shank / you hook etc. etc. etc. golf is a very physical and precise game to be taken lightly.

  4. Brad

    Sep 27, 2015 at 4:42 am

    Which would have the greatest effect on mis-hits, gear effect or moi? If I was to hit 0,5cm off center which would end up closest to where I was aiming? Would I be correct in saying that for example a G30 driver has a higher moi than for example a SLDR and vice versa, SLDR has less gear effect than a G30 because of where the CG is located?

  5. Hippocamp

    Sep 26, 2015 at 8:59 am

    Thanks for this explanation. Really very clear. Here’s a question. To reduce the gear effect in drivers, it should help to move the center of mass closer to the club face, so it is more like an iron. Weight-forward drivers like some of the low spin models should show a reduced gear effect, right?
    The lack of forgiveness in these clubs would then seem to be more a matter of loss of ball speed at heel and toe rather than a loss of directional control. Or am I missing something?

  6. other paul

    Sep 25, 2015 at 12:31 pm

    Adam, can we get an article on how rate of closure effects gear effect on the face. I have a huge problem with hooks (shut face) and was able to beat it by slowing my closure rate down with a bigger grip. I hit 6/10 dead straight with it. The other 4 weren’t bad either.

    • Adam Young

      Sep 25, 2015 at 1:16 pm

      Hi Paul,
      rate of closure only minimally affects the gearing at impact, but it works in reverse, with a higher rate of closure causing more fade spin. However, this can be easily offset by the club face being more close to the path at impact.

      Gear effect is only really an issue on off-centre strikes. I wouldn’t worry about gearing on middled contacts – be more concerned with face and path relationships. Although, it makes sense that your hook may have minimised as you tried to hit a hold off shot.

  7. John Grossi

    Sep 25, 2015 at 11:44 am

    Adam, thanks for another informative article. I understand toe shots produce hook spin. I have read that the most common miss from mid to high handicap players is a toe shot. Why then do most of these players slice the ball? Based on your previous articles and your book, I am thinking swing path is out to in. It can be confusing. John

    • Adam Young

      Sep 25, 2015 at 12:04 pm

      Hi John,

      The majority of slicers I see hit the ball from the heel. This can sometimes be the cause of the slice, but more often simply correlates with an open face to path and left swing direction.

      I always use marker pens to monitor strike location, and use Trackman to quantify path numbers. I can also get an idea from the face/path/spin axis relationships to see where the ball was hit on the face

  8. Huge

    Sep 25, 2015 at 11:41 am

    You realize this will make no sense whatsoever to high handicappers who can’t hit the ball straight at all. Because all they see, then, in this article’s analysis, is that the driver’s face shouldn’t be this large! They’re going to ask, well, then, why don’t you guys make driver faces and heads the same size as an iron, so there is less twisting???? They’ll also ask you, is this why most players struggle to hit the hybrid properly???? but can hit the iron better?
    So why do we make such huge driver heads?

  9. TR1PTIK

    Sep 25, 2015 at 10:21 am

    I’ve used foot powder spray at the driving range and found it extremely helpful in identifying impact location. Depending on the location of the strike, the sound and feel is entirely different. I now know that a muted “ting” combined with a “hard” impact means that I hit the ball low and out of the heel (my most common miss). A louder “crack” combined with a “medium-hard” to “hard” impact means I was close to center, but high on the face (second most common). A loud “crack” combined with a “soft” impact means I was much closer to finding the club’s CG.

    Good article Adam. Keep it up.

  10. Christestrogen

    Sep 25, 2015 at 9:19 am

    What if the gears were nails?
    Mind blown ***

    • Brian

      Sep 25, 2015 at 9:49 am

      Haha!

    • other paul

      Sep 25, 2015 at 12:28 pm

      Stop picking on the poor guy. He was made fun of a lot for that article. But it is a good starting point for beginners. So you really shouldn’t mock him for it. Not everyone can be a pro WRXer like you… Or me ????

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Instruction

The Wedge Guy: The easiest-to-learn golf basic

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My golf learning began with this simple fact – if you don’t have a fundamentally sound hold on the golf club, it is practically impossible for your body to execute a fundamentally sound golf swing. I’m still a big believer that the golf swing is much easier to execute if you begin with the proper hold on the club.

As you might imagine, I come into contact with hundreds of golfers of all skill levels. And it is very rare to see a good player with a bad hold on the golf club. There are some exceptions, for sure, but they are very few and very far between, and they typically have beat so many balls with their poor grip that they’ve found a way to work around it.

The reality of biophysics is that the body moves only in certain ways – and the particulars of the way you hold the golf club can totally prevent a sound swing motion that allows the club to release properly through the impact zone. The wonderful thing is that anyone can learn how to put a fundamentally sound hold on the golf club, and you can practice it anywhere your hands are not otherwise engaged, like watching TV or just sitting and relaxing.

Whether you prefer an overlap, interlock or full-finger (not baseball!) grip on the club, the same fundamentals apply.  Here are the major grip faults I see most often, in the order of the frequency:

Mis-aligned hands

By this I mean that the palms of the two hands are not parallel to each other. Too many golfers have a weak left hand and strong right, or vice versa. The easiest way to learn how to hold the club with your palms aligned properly is to grip a plain wooden ruler or yardstick. It forces the hands to align properly and shows you how that feels. If you grip and re-grip a yardstick several times, then grip a club, you’ll see that the learning curve is almost immediate.

The position of the grip in the upper/left hand

I also observe many golfers who have the butt of the grip too far into the heel pad of the upper hand (the left hand for right-handed players). It’s amazing how much easier it is to release the club through the ball if even 1/4-1/2″ of the butt is beyond the left heel pad. Try this yourself to see what I mean.  Swing the club freely with just your left hand and notice the difference in its release from when you hold it at the end of the grip, versus gripping down even a half inch.

To help you really understand how this works, go to the range and hit shots with your five-iron gripped down a full inch to make the club the same length as your seven-iron. You will probably see an amazing shot shape difference, and likely not see as much distance loss as you would expect.

Too much lower (right) hand on the club

It seems like almost all golfers of 8-10 handicap or higher have the club too far into the palm of the lower hand, because that feels “good” if you are trying to control the path of the clubhead to the ball. But the golf swing is not an effort to hit at the ball – it is a swing of the club. The proper hold on the club has the grip underneath the pad at the base of the fingers. This will likely feel “weak” to you — like you cannot control the club like that. EXACTLY. You should not be trying to control the club with your lower/master hand.

Gripping too tightly

Nearly all golfers hold the club too tightly, which tenses up the forearms and prevents a proper release of the club through impact. In order for the club to move back and through properly, you must feel that the club is controlled by the last three fingers of the upper hand, and the middle two fingers of the lower hand. If you engage your thumbs and forefingers in “holding” the club, the result will almost always be a grip that is too tight. Try this for yourself. Hold the club in your upper hand only, and squeeze firmly with just the last three fingers, with the forefinger and thumb off the club entirely. You have good control, but your forearms are not tense. Then begin to squeeze down with your thumb and forefinger and observe the tensing of the entire forearm. This is the way we are made, so the key to preventing tenseness in the arms is to hold the club very lightly with the “pinchers” — the thumbs and forefingers.

So, those are what I believe are the four fundamentals of a good grip. Anyone can learn them in their home or office very quickly. There is no easier way to improve your ball striking consistency and add distance than giving more attention to the way you hold the golf club.

More from the Wedge Guy

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Clement: Stop ripping off your swing with this drill!

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Not the dreaded headcover under the armpit drill! As if your body is defective and can’t function by itself! Have you seen how incredible the human machine is with all the incredible feats of agility all kinds of athletes are accomplishing? You think your body is so defective (the good Lord is laughing his head off at you) that it needs a headcover tucked under the armpit so you can swing like T-Rex?

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How a towel can fix your golf swing

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This is a classic drill that has been used for decades. However, the world of marketed training aids has grown so much during that time that this simple practice has been virtually forgotten. Because why teach people how to play golf using everyday items when you can create and sell a product that reinforces the same thing? Nevertheless, I am here to give you helpful advice without running to the nearest Edwin Watts or adding something to your Amazon cart.

For the “scoring clubs,” having a solid connection between the arms and body during the swing, especially through impact, is paramount to creating long-lasting consistency. And keeping that connection throughout the swing helps rotate the shoulders more to generate more power to help you hit it farther. So, how does this drill work, and what will your game benefit from it? Well, let’s get into it.

Setup

You can use this for basic chip shots up to complete swings. I use this with every club in my bag, up to a 9 or 8-iron. It’s natural to create incrementally more separation between the arms and body as you progress up the set. So doing this with a high iron or a wood is not recommended.

While you set up to hit a ball, simply tuck the towel underneath both armpits. The length of the towel will determine how tight it will be across your chest but don’t make it so loose that it gets in the way of your vision. After both sides are tucked, make some focused swings, keeping both arms firmly connected to the body during the backswing and follow through. (Note: It’s normal to lose connection on your lead arm during your finishing pose.) When you’re ready, put a ball in the way of those swings and get to work.

Get a Better Shoulder Turn

Many of us struggle to have proper shoulder rotation in our golf swing, especially during long layoffs. Making a swing that is all arms and no shoulders is a surefire way to have less control with wedges and less distance with full swings. Notice how I can get in a similar-looking position in both 60° wedge photos. However, one is weak and uncontrollable, while the other is strong and connected. One allows me to use my larger muscles to create my swing, and one doesn’t. The follow-through is another critical point where having a good connection, as well as solid shoulder rotation, is a must. This drill is great for those who tend to have a “chicken wing” form in their lead arm, which happens when it becomes separated from the body through impact.

In full swings, getting your shoulders to rotate in your golf swing is a great way to reinforce proper weight distribution. If your swing is all arms, it’s much harder to get your weight to naturally shift to the inside part of your trail foot in the backswing. Sure, you could make the mistake of “sliding” to get weight on your back foot, but that doesn’t fix the issue. You must turn into your trial leg to generate power. Additionally, look at the difference in separation between my hands and my head in the 8-iron examples. The green picture has more separation and has my hands lower. This will help me lessen my angle of attack and make it easier to hit the inside part of the golf ball, rather than the over-the-top move that the other picture produces.

Stay Better Connected in the Backswing

When you don’t keep everything in your upper body working as one, getting to a good spot at the top of your swing is very hard to do. It would take impeccable timing along with great hand-eye coordination to hit quality shots with any sort of regularity if the arms are working separately from the body.

Notice in the red pictures of both my 60-degree wedge and 8-iron how high my hands are and the fact you can clearly see my shoulder through the gap in my arms. That has happened because the right arm, just above my elbow, has become totally disconnected from my body. That separation causes me to lift my hands as well as lose some of the extension in my left arm. This has been corrected in the green pictures by using this drill to reinforce that connection. It will also make you focus on keeping the lead arm close to your body as well. Because the moment either one loses that relationship, the towel falls.

Conclusion

I have been diligent this year in finding a few drills that target some of the issues that plague my golf game; either by simply forgetting fundamental things or by coming to terms with the faults that have bitten me my whole career. I have found that having a few drills to fall back on to reinforce certain feelings helps me find my game a little easier, and the “towel drill” is most definitely one of them.

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