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The Wedge Guy: Understanding CG

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One of the most misunderstood concepts involved in golf club design is that of “CG,” or “center of gravity,” also “center of mass.” While this particular measurement of any golf club head can certainly offer insight into its probable performance, it is not the “be all, end all” with regard to any club’s specific launch or forgiveness attributes.

What “CG” specifically refers to is the exact center location of a club’s distribution of mass, which will generally coincide with that club’s “sweet spot”—but that’s not always true. There are lots of ways to manipulate or manage any club’s exact CG location, and therein lies a “Pandora’s Box” of misunderstanding.

Let’s start back in the very old days, when irons were single pieces of forged steel and woods were made of persimmon. Since there was no science inside the club, CG was essentially a result of how the clubhead is formed—its essential shape.

A typical persimmon driver head, for example, was sized to deliver its ideal weight without any additional weights added. The solid block of persimmon, with some kind of face insert and an aluminum soleplate was all you had to work with. So, the CG was located pretty close to the center of the clubhead from all three axes – vertical, front-go-back and heel-to-toe. If you remember, persimmon fairway woods were smaller and had a brass sole plate to add mass lower in the head and often a lead weight under the sole plate to move the CG even lower to help produce higher ball flights on shots hit from the turf, rather than off a tee.

Traditional forged irons up to the 1960s-70s typically had a CG very close to the hosel, a result of the mass of the hosel itself and the typical design that put “muscle” behind the impact area, and very little mass out toward the toe. An examination of worn faces on those old irons would reveal the wear very much toward the heel. I distinctly remember fighting the shanks back in those days, and that ugly shot usually felt very close to a perfectly struck one, rather than feeling as awful as it looked.

As metal woods and cavity-back irons became the norm, designers were able to move the CG ever lower in order to produce higher ball flight, and more toward the center of the face to put the CG further from the hosel. As technology has continued to be refined, the use of tungsten inserts has further allowed designers to position the CG exactly where they want it – typically lower in the club and more toward the center or even the toe of the golf club.

And therein lies a problem with pushing this insert technology too far.

There is no question that in addition to making contact somewhere close to the CG of the clubhead, ball performance is also a product of how much mass is directly behind the impact point. Let me offer this example of how important that can be.

Let’s assume two identically shaped cavity-back 7-irons – same size, face thickness, overall weight and a design that places the CG in the exact same spot in the scoring pattern. The only difference between the two is that one is a single piece forged or cast steel head, with the other being cast of aluminum, with heavy tungsten inserts in the hosel and toe areas to achieve the same overall weight and CG location.
Which do you think would deliver the more solid feel of impact and better transfer of energy to the ball?

Now, we could take that even further by cutting out the entire center of both clubheads and increase the mass or the weight of tungsten in the hosel and toe to bring each back up to weight. The CG location would not change, but there would be absolutely no mass at all where the ball impact location would be. That would not work at all, would it?

I’ve learned long ago that it’s not just about the location of the CG that makes a golf club perform, but also the amount of mass that is placed directly behind the spot on the face where impact with the ball is made.

Here’s a fun, “non-golf” way to embrace this concept.

Suppose we had a two-pound sledgehammer and another 2 lb piece of steel hammered into a large circular sheet 1/16” thick. And then suppose someone hit you on the head with the exact CG of each one – which do you think would hurt the most?

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Terry Koehler is a fourth generation Texan and a graduate of Texas A&M University. Over his 40-year career in the golf industry, he has created over 100 putter designs, sets of irons and drivers, and in 2014, he put together the team that reintroduced the Ben Hogan brand to the golf equipment industry. Since the early 2000s, Terry has been a prolific writer, sharing his knowledge as “The Wedge Guy”.   But his most compelling work is in the wedge category. Since he first patented his “Koehler Sole” in the early 1990s, he has been challenging “conventional wisdom” reflected in ‘tour design’ wedges. The performance of his wedge designs have stimulated other companies to move slightly more mass toward the top of the blade in their wedges, but none approach the dramatic design of his Edison Forged wedges, which have been robotically proven to significantly raise the bar for wedge performance. Terry serves as Chairman and Director of Innovation for Edison Golf – check it out at www.EdisonWedges.com.

8 Comments

8 Comments

  1. Reid Thompson

    Mar 4, 2021 at 12:51 pm

    I was kind of looking for if low CG creates low spin or the opposite.

    • Terry Koehler

      Mar 7, 2021 at 2:50 pm

      A low CG will tend to reduce spin and elevate ball flight.

  2. Jon

    Mar 4, 2021 at 7:19 am

    You’re correct… I believe they’ve gone from extreme perimeter weighting , thinking forgiveness to understanding that if you create more back spin with a lower center of gravity, you create less side spin. .. Therefore, more forgiveness than perimeter weighting.

  3. Martien Schwencke

    Mar 4, 2021 at 6:45 am

    The point of percusion is not always where the centre of grafety is.
    A good desined club the point of percusion is locaed in the middel of the face.

  4. T Carter

    Mar 3, 2021 at 1:12 pm

    Not saying any of these comparisons are wrong, they are just not porportional to the game of golf. Another comparison you could make is pounding fence posts. You could use a sledge hammer to hit the top of a post or you could use a post pounder which provides consistent results due to innovative shaping of metal. A sledge hammer could be more effective in the use of very skilled hands, but the pounder is much much much more user friendly and even professionals use them too for consistency.

    Also keep in mind that we are swinging golf clubs at a very high speed and everyone could use some forgiveness even though a perfect shot may not perform like a perfect shot with blades.

  5. Joe

    Mar 3, 2021 at 11:00 am

    The last comment in this article proves this guy has no understanding of engineering. This literally just reads like a marketing piece to explain why his wedges are better.

    • Raj lp

      Mar 3, 2021 at 11:12 am

      Care to explain?

    • Engineer

      Mar 3, 2021 at 5:39 pm

      Agree. This makes no sense. If that 1/16″ thick metal hit you in the back of the head it would feel the same, except that the metal flexes and the load is distributed. Look at track man if you think there’s some kind of difference. Track man doesn’t ask you if you’re playing a cavity back iron or a muscle back blade. It simply says, path + face angle = ball flight.

      Very little of this article is about cg.

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19th Hole

Vincenzi’s LIV Golf Singapore betting preview: Course specialist ready to thrive once again

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After another strong showing in Australia, LIV Golf will head to Sentosa Golf Club in Singapore looking to build off of what was undoubtedly their best event to date.

Sentosa Golf Club sits on the southern tip of Singapore and is one of the most beautiful courses in the world. The course is more than just incredible scenically; it was also rated 55th in Golf Digest’s top-100 courses in 2022-2023 and has been consistently regarded as one of the best courses in Asia. Prior to being part of the LIV rotation, the course hosted the Singapore Open every year since 2005.

Sentosa Golf Club is a par 71 measuring 7,406 yards. The course will require precise ball striking and some length off the tee. It’s possible to go low due to the pristine conditions, but there are also plenty of hazards and difficult spots on the course that can bring double bogey into play in a hurry. The Bermudagrass greens are perfectly manicured, and the course has spent millions on the sub-air system to keep the greens rolling fast. I spoke to Asian Tour player, Travis Smyth, who described the greens as “the best [he’s] ever played.”

Davis Love III, who competed in a Singapore Open in 2019, also gushed over the condition of the golf course.

“I love the greens. They are fabulous,” the 21-time PGA Tour winner said.

Love III also spoke about other aspects of the golf course.

“The greens are great; the fairways are perfect. It is a wonderful course, and it’s tricky off the tee.”

“It’s a long golf course, and you get some long iron shots. It takes somebody hitting it great to hit every green even though they are big.”

As Love III said, the course can be difficult off the tee due to the length of the course and the trouble looming around every corner. It will take a terrific ball striking week to win at Sentosa Golf Club.

In his pre-tournament press conference last season, Phil Mickelson echoed many of the same sentiments.

“To play Sentosa effectively, you’re going to have a lot of shots from 160 to 210, a lot of full 6-, 7-, 8-iron shots, and you need to hit those really well and you need to drive the ball well.”

Golfers who excel from tee to green and can dial in their longer irons will have a massive advantage this week.

Stat Leaders at LIV Golf Adelaide:

Fairways Hit

1.) Louis Oosthuizen

2.) Anirban Lahiri

3.) Jon Rahm

4.) Brendan Steele

5.) Cameron Tringale

Greens in Regulation

1.) Brooks Koepka

2.) Brendan Steele

3.) Dean Burmester

4.) Cameron Tringale

5.) Anirban Lahiri

Birdies Made

1.) Brendan Steele

2.) Dean Burmester

3.) Thomas Pieters

4.) Patrick Reed

5.) Carlos Ortiz

LIV Golf Individual Standings:

1.) Joaquin Niemann

2.) Jon Rahm

3.) Dean Burmester

4.) Louis Oosthuizen

5.) Abraham Ancer

LIV Golf Team Standings:

1.) Crushers

2.) Legion XIII

3.) Torque

4.) Stinger GC

5.) Ripper GC

LIV Golf Singapore Picks

Sergio Garcia +3000 (DraftKings)

Sergio Garcia is no stranger to Sentosa Golf Club. The Spaniard won the Singapore Open in 2018 by five strokes and lost in a playoff at LIV Singapore last year to scorching hot Talor Gooch. Looking at the course setup, it’s no surprise that a player like Sergio has played incredible golf here. He’s long off the tee and is one of the better long iron players in the world when he’s in form. Garcia is also statistically a much better putter on Bermudagrass than he is on other putting surfaces. He’s putt extremely well on Sentosa’s incredibly pure green complexes.

This season, Garcia has two runner-up finishes, both of them being playoff losses. Both El Camaleon and Doral are courses he’s had success at in his career. The Spaniard is a player who plays well at his tracks, and Sentosa is one of them. I believe Sergio will get himself in the mix this week. Hopefully the third time is a charm in Singapore.

Paul Casey +3300 (FanDuel)

Paul Casey is in the midst of one of his best seasons in the five years or so. The results recently have been up and down, but he’s shown that when he’s on a golf course that suits his game, he’s amongst the contenders.

This season, Casey has finishes of T5 (LIV Las Vegas), T2 (LIV Hong Kong), and a 6th at the Singapore Classic on the DP World Tour. At his best, the Englishman is one of the best long iron players in the world, which makes him a strong fit for Sentosa. Despite being in poor form last season, he was able to fire a Sunday 63, which shows he can low here at the course.

It’s been three years since Casey has won a tournament (Omega Dubai Desert Classic in 2021), but he’s been one of the top players on LIV this season and I think he can get it done at some point this season.

Mito Pereira +5000 (Bet365)

Since Mito Pereira’s unfortunate demise at the 2022 PGA Championship, he’s been extremely inconsistent. However, over the past few months, the Chilean has played well on the International Series as well as his most recent LIV start. Mito finished 8th at LIV Adelaide, which was his best LIV finish this season.

Last year, Pereira finished 5th at LIV Singapore, shooting fantastic rounds of 67-66-66. It makes sense why Mito would like Sentosa, as preeminent ball strikers tend to rise to the challenge of the golf course. He’s a great long iron player who is long and straight off the tee.

Mito has some experience playing in Asia and is one of the most talented players on LIV who’s yet to get in the winner’s circle. I have questions about whether or not he can come through once in contention, but if he gets there, I’m happy to roll the dice.

Andy Ogletree +15000 (DraftKings)

Andy Ogletree is a player I expected to have a strong 2024 but struggled early in his first full season on LIV. After failing to crack the top-25 in any LIV event this year, the former U.S. Amateur champion finally figured things out, finished in a tie for 3rd at LIV Adelaide.

Ogletree should be incredible comfortable playing in Singapore. He won the International Series Qatar last year and finished T3 at the International Series Singapore. The 26-year-old was arguably the best player on the Asian Tour in 2023 and has been fantastic in the continent over the past 18 months.

If Ogletree has indeed found form, he looks to be an amazing value at triple-digit odds.

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Opinion & Analysis

Ryan: Lessons from the worst golf instructor in America

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In Tampa, there is a golf course that boasts carts that do not work, a water range, and a group of players none of which have any chance to break 80. The course is overseen by a staff of crusty men who have succeeded at nothing in life but ending up at the worst-run course in America. However, this place is no failure. With several other local courses going out of business — and boasting outstanding greens — the place is booked full.

While I came for the great greens, I stayed to watch our resident instructor; a poor-tempered, method teacher who caters to the hopeless. At first, it was simply hilarious. However, after months of listening and watching, something clicked. I realized I had a front-row seat to the worst golf instructor in America.

Here are some of my key takeaways.

Method Teacher

It is widely accepted that there are three types of golf instructors: system teachers, non-system teachers, and method teachers. Method teachers prescribe the same antidote for each student based on a preamble which teachers can learn in a couple day certification.

Method teaching allows anyone to be certified. This process caters to the lowest caliber instructor, creating the illusion of competency. This empowers these underqualified instructors with the moniker of “certified” to prey on the innocent and uninformed.

The Cult of Stack and Jilt

The Stack and Tilt website proudly boasts, “A golfer swings his hands inward in the backswing as opposed to straight back to 1) create power, similar to a field goal kicker moving his leg in an arc and 2) to promote a swing that is in-to-out, which produces a draw (and eliminates a slice).”

Now, let me tell you something, there is this law of the universe which says “energy can either be created or destroyed,” so either these guys are defying physics or they have no idea what they are taking about. Further, the idea that the first move of the backswing determines impact is conjecture with a splash of utter fantasy.

These are the pontifications of a method — a set of prescriptions applied to everyone with the hope of some success through the placebo effect. It is one thing for a naive student to believe, for a golf instructor to drink and then dispel this Kool-Aid is malpractice.

Fooled by Randomness

In flipping a coin, or even a March Madness bet, there is a 50-50 chance of success. In golf, especially for new players, results are asymmetric. Simply put: Anything can happen. The problem is that when bad instructors work with high handicappers, each and every shot gets its own diagnosis and prescription. Soon the student is overwhelmed.

Now here’s the sinister thing: The overwhelming information is by design. In this case, the coach is not trying to make you better, they are trying to make you reliant on them for information. A quasi Stockholm syndrome of codependency.

Practice

One of the most important scientists of the 20th century was Ivan Pavlov. As you might recall, he found that animals, including humans, could be conditioned into biological responses. In golf, the idea of practice has made millions of hackers salivate that they are one lesson or practice session from “the secret.”

Sunk Cost

The idea for the worst golf instructor is to create control and dependency so that clients ignore the sunk cost of not getting better. Instead, they are held hostage by the idea that they are one lesson or tip away from unlocking their potential.

Cliches

Cliches have the effect of terminating thoughts. However, they are the weapon of choice for this instructor. Add some hyperbole and students actually get no information. As a result, these players couldn’t play golf. When they did, they had no real scheme. With no idea what they are doing, they would descend into a spiral of no idea what to do, bad results, lower confidence, and running back to the lesson tee from more cliches.

The fact is that poor instruction is about conditioning players to become reliant members of your cult. To take away autonomy. To use practice as a form of control. To sell more golf lessons not by making people better but through the guise that without the teacher, the student can never reach their full potential. All under the umbrella of being “certified” (in a 2-day course!) and a melee of cliches.

This of course is not just happening at my muni but is a systemic problem around the country and around the world, the consequences of which are giving people a great reason to stop playing golf. But hey, at least it’s selling a lot of golf balls…

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19th Hole

Vincenzi’s 2024 Zurich Classic of New Orleans betting preview

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The PGA TOUR heads to New Orleans to play the 2023 Zurich Classic of New Orleans. In a welcome change from the usual stroke play, the Zurich Classic is a team event. On Thursday and Saturday, the teams play best ball, and on Friday and Sunday the teams play alternate shot.

TPC Louisiana is a par 72 that measures 7,425 yards. The course features some short par 4s and plenty of water and bunkers, which makes for a lot of exciting risk/reward scenarios for competitors. Pete Dye designed the course in 2004 specifically for the Zurich Classic, although the event didn’t make its debut until 2007 because of Hurricane Katrina.

Coming off of the Masters and a signature event in consecutive weeks, the field this week is a step down, and understandably so. Many of the world’s top players will be using this time to rest after a busy stretch.

However, there are some interesting teams this season with some stars making surprise appearances in the team event. Some notable teams include Patrick Cantlay and Xander Schauffele, Rory McIlroy and Shane Lowry, Collin Morikawa and Kurt Kitayama, Will Zalatoris and Sahith Theegala as well as a few Canadian teams, Nick Taylor and Adam Hadwin and Taylor Pendrith and Corey Conners.

Past Winners at TPC Louisiana

  • 2023: Riley/Hardy (-30)
  • 2022: Cantlay/Schauffele (-29)
  • 2021: Leishman/Smith (-20)
  • 2019: Palmer/Rahm (-26)
  • 2018: Horschel/Piercy (-22)
  • 2017: Blixt/Smith (-27)

2024 Zurich Classic of New Orleans Picks

Tom Hoge/Maverick McNealy +2500 (DraftKings)

Tom Hoge is coming off of a solid T18 finish at the RBC Heritage and finished T13 at last year’s Zurich Classic alongside Harris English.

This season, Hoge is having one of his best years on Tour in terms of Strokes Gained: Approach. In his last 24 rounds, the only player to top him on the category is Scottie Scheffler. Hoge has been solid on Pete Dye designs, ranking 28th in the field over his past 36 rounds.

McNealy is also having a solid season. He’s finished T6 at the Waste Management Phoenix Open and T9 at the PLAYERS Championship. He recently started working with world renowned swing coach, Butch Harmon, and its seemingly paid dividends in 2024.

Keith Mitchell/Joel Dahmen +4000 (DraftKings)

Keith Mitchell is having a fantastic season, finishing in the top-20 of five of his past seven starts on Tour. Most recently, Mitchell finished T14 at the Valero Texas Open and gained a whopping 6.0 strokes off the tee. He finished 6th at last year’s Zurich Classic.

Joel Dahmen is having a resurgent year and has been dialed in with his irons. He also has a T11 finish at the PLAYERS Championship at TPC Sawgrass which is another Pete Dye track. With Mitchell’s length and Dahmen’s ability to put it close with his short irons, the Mitchell/Dahmen combination will be dangerous this week.

Taylor Moore/Matt NeSmith +6500 (DraftKings)

Taylor Moore has quickly developed into one of the more consistent players on Tour. He’s finished in the top-20 in three of his past four starts, including a very impressive showing at The Masters, finishing T20. He’s also finished T4 at this event in consecutive seasons alongside Matt NeSmith.

NeSmith isn’t having a great 2024, but has seemed to elevate his game in this format. He finished T26 at Pete Dye’s TPC Sawgrass, which gives the 30-year-old something to build off of. NeSmith is also a great putter on Bermudagrass, which could help elevate Moore’s ball striking prowess.

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