Equipment

How the idea of shaft frequency began

Published

7 years ago

Jun 4, 2017

Forty years ago, Kim Braly and his father Dr. Braly went down to West Palm Beach to visit Wilson Golf, and that trip forever changed the way the golf industry thinks about the shafts in golf clubs.

“My father and I invented frequency matching,” Kim told me.

“And what’s that?” I asked.

“It’s the process of matching the stiffness of the shafts in your clubs to the heads so you can hit a golf ball rather than snap the shaft or hit the ball all over the place,” Kim said.

OK, that got my attention. So I ask how he stumbled upon the idea.

“My dad was an engineer and got into golf,” Kim said. “Eventually, I got interested in golf as well. In the early 1980s, we went to see the original ‘Iron Byron.’”

A modern-day golf robot at Titleist’s Manchester Lane Test Facility.

Iron Byron was the first club-testing machine, and it was modeled after smooth-swinging legend Byron Nelson. It’s basically an early robot — a motor in a box with an arm — built to use a regular golf club to hit a golf ball.

Kim and Dr. Braly watched the engineer operating Iron Byron put a club into the mechanical arm, place a ball in front of the club face and then press a button to swing the club. The result: perfection. It produced a high, piercing ball flight that was hit on a rope, not far removed from the storied ball flight of Nelson himself. This was followed by another and another. Kim and his father were ecstatic.

With great anticipation, they watched the engineer load the next club. The results were much different. Balls flew all over the place. The dispersion was awful. The Wilson engineer operating Iron Byron slowed down the machine. Balls flew shorter distances, but they landed closer together. The dispersion had been reduced. This was the inception of their game-changing idea; dispersion was a result of certain shaft characteristics matched with a club head and swing speeds. This “AH HA” moment changed how we fit and purchase golf clubs today.

Based on this observation, Kim and Dr. Braly designed a method to measure the performance of a golf shaft. Later, this led to the concept of frequency: very simply, stiffness is not the letter on the shaft, but a measurement based on characteristics like weight of shaft, weight of the head, length of the shaft and several other characteristics. The year was 1977 and they submitted a patent on this idea called “Frequency Matching.”

Armed with the power of measurement, Kim was ready to change golf shafts forever. He and his father started traveling the PGA Tour, and in doing so became the first “PGA Tour Van.” Over the last 40 years, Kim has worked as a researcher and designer, mastering the golf shaft. He’s worked at True Temper, Royal Precision and is currently as the head designer of research and development at KBS Golf Shafts.

Kim working with a player on his golf equipment.

In 2008, Kim launched a shaft company called KBS, which became the fastest growing shaft company in golf. Since that time, the company has gotten some of the best golfers in the world to use its shafts products, including Rickie Fowler, Justin Rose and Phil Mickelson.

The next time you’re struggling with shots that fly sideways, think about Kim and Dr. Braly. You might want to try try being fit for shafts if you haven’t already, because they may just be the most important part of your golf club.

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Brendan Ryan

Brendan Ryan, an entrepreneur and scientist, is a passionate golfer who loves his local muni. Armed with a keen interest in the game, a large network of friends in the industry, Brendan works to find and produce unique content for GolfWRX.

13 Comments

TeeBone

Jun 7, 2017 at 5:34 pm

Further, frequency matching a set doesn’t mean that the clubs all have the SAME shaft flexibility, only that the DIFFERENCE in flexibility is uniform from club to club. As the clubs get shorter, frequency and stiffness increase. Add to this the fact that as the clubs get shorter and heavier, they are swung at a slower speed. In the end, each shaft in a set flexes more and more overall as the clubs get longer. This silly “dispersion” theory suggests that a shaft must flex a specific amount to behave consistently.

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TeeBone

Jun 7, 2017 at 2:39 pm

Tour players, unless they have a specific shaft manufacturer deal, are free to play whatever shaft they want. Their decision to play graphite over steel has to do with performance, not money.

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TeeBone

Jun 7, 2017 at 2:27 pm

So Iron Byron, set at any particular swing speed, only reproduces the same ball flight with one specific shaft flex? This “dispersion” theory would mean that the same shaft can behave quite differently, from swing to swing, for an otherwise same swing input. Nonsense. There is no mention of this in any of the best-regarded scientific studies of shaft flexibility. This is a made-up marketing story designed to sell equipment.

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Ned

Jun 6, 2017 at 8:06 am

Brunswick Golf developed the Frequency Matching System in 1981!

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- Rico
  
  Jun 6, 2017 at 4:04 pm
  
  The article states that the Braly’s submitted a patent for “Frequency Matching” in 1977.
  
  Reply Report comment
J.

Jun 5, 2017 at 7:15 pm

And stiffness of an EI profile may be invisible to CPM matching? Does SST PURE shaft alignment work better?

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- Skip
  
  Jun 7, 2017 at 1:18 pm
  
  SST pure is pure Kool-Aid. Drink it if you so choose.
  
  Reply Report comment
tim crider

Jun 5, 2017 at 4:05 pm

There is no doubt that shots can be saved every round by every player with changes from the shaft to the swing weight to the compression of your golf ball,,, hell practicing on the driving range could improve your game. There is a lot to know about this game and if you have the money and the time you may be able to cash in on these findings. Think how much better play got when shafts changed to steel from hickory. A lot to know and even more to learn. How much more can be found and improved, it was a very good article.

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Charles Bartholomew

Jun 5, 2017 at 3:38 pm

Interesting article. A little history lesson now and then is a good thing.

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cgasucks

Jun 5, 2017 at 8:20 am

If the Iron Byron can make crappy shots with a shaft that isn’t compatible with its swing speed, imagine it with a human being.

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- talljohn777
  
  Jun 5, 2017 at 12:14 pm
  
  Yes, if you have a club shaft that is too soft you can slow your swing down to allow the clubhead time to catch up and square, but why would you want to do that? The preference would be to hit a club that matches your top swing speed allowing you to get the most out of your swing.
  
  Reply Report comment
artie j

Jun 5, 2017 at 6:59 am

I didn’t know the backstory. Very cool article Ryan

Reply Report comment
SH

Jun 4, 2017 at 10:25 am

Yup, awesome

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Equipment

A shocking Backstryke putter appearance + 7 interesting gear photos from the Zurich Classic

Published

13 hours ago

Apr 25, 2024

Andrew Tursky

Welcome to New Orleans, where TPC Louisiana plays host to the 2024 Zurich Classic. In between breakfast beignets and nightly Creole feasts, PGA Tour players are also competing in the unique two-man format at the Zurich this week.

Although the vibes in Nawlins are a bit lighter-fare than the recent back-to-back competitions the Masters and the RBC Heritage signature event), the gear news was no less serious this week.

We spotted some recent changes from Rory McIlroy, a very rare Odyssey Backstryke putter, dove into the bag of legendary New Orleans Saints quarterback Drew Brees, and spotted Patrick Cantlay continuing to test new equipment.

Get your beads out and crack your crawfish, because it’s time for an equipment rundown from The Big Easy (meaning New Orleans, of course, not Ernie Els).

See all of our photos from the Zurich Classic here

Rory’s on-and-off lob wedge

Since the end of 2023, Rory McIlroy has had an on-again, off-again relationship with a Titleist Vokey K-Grind lob wedge. In his last start, it was on, and the wedge is back in the bag again this week. We got a great look at the complicated grind that McIlroy uses.

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A full look into McIlroy’s bag above also shows that he switched out of the TaylorMade BRNR Mini Copper that he used at the RBC Heritage, and he’s back into the Qi10 core 3-wood. As we discussed last week, McIlroy will likely keep the BRNR around as a course-specific club, trading it in and out for the 3-wood.

See Rory McIlroy’s full 2024 WITB from the Zurich here

Turning Back the clock

Unless Tommy Gainey is in the field, it’s unlikely you’ll ever see Odyssey’s Backstryke technology make an appearance on the PGA Tour.

But then, when you least expect it, Russ Cochran shows up.

For more than a decade – since the 2013 Sony Open in Hawai’i – Cochran has been stuck on 599 PGA Tour starts. This week will be his 600th.

Cochran is in the field at the Zurich this week playing alongside Eric Cole, whose regular caddie is Reed Cochran, Russ’s son.

The Backstryke putter was first released back in 2010, and its unique design helps shift the axis point of the putter closer to the CG of the head. And, the putter is getting a nod this week at the Zurich Classic, thanks to Cochran’s 600th career PGA Tour start.

The putter is certainly awesome, but don’t forget to check out Cochran’s full WITB from this week.

Drew Brees with a Super Bowl winning Scotty Cameron putter

Drew Brees, a legendary retired quarterback for the hometown New Orleans Saints, made an appearance at the Zurich’s Wednesday Pro-Am, playing alongside Zach Johnson, Ryan Palmer, and current Saints QB Derek Carr.

Brees’ bag included a TaylorMade Stealth2 Plus driver, a BRNR Mini 13.5-degree, a Stealth 5-wood, a mixed set of P-790 and P-760 irons, Milled Grind Hi-Toe wedges, and a custom Scotty Cameron “New Orleans Saints” putter, which Scotty made for Brees following his Super Bowl MVP-winning performance in 2010.

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It should also be noted that Brees has his Venmo QR code as a bag tag.

If you’re gambling with Brees on the course, just know that not having cash won’t work as an excuse.

Brilliant.

See Drew Brees’ full WITB from the Zurich here

Stricker’s unrecognizable putter

Steve Stricker has made numerous upgrades to his bag recently, including a new TSR3 driver and T100 irons, but his longtime Odyssey White Hot No. 2 putter is still going strong. It’s the most recognizable unrecognizable putter ever.

Here’s a better look at Stricker’s flatstick, which he started using back in 2007.

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Patrick Cantlay has opened the equipment-switching floodgates

Over on the PGA Tour’s Equipment Report this week, we covered Cantlay’s recent switch into Ping Blueprint S irons, and a Titleist TSR2 driver.

Cantlay hadn’t switched irons for about seven years, so the iron switch he made at The 2024 Masters came as a shock to the norm. He simply isn’t one to change gear very often, so anytime Cantlay makes a switch, it’s news.

It seems the floodgates of equipment testing have opened up a bit for Cantlay, who was also spotted testing a custom Scotty Cameron blade putter on Tuesday this week. By Wednesday, Cantlay was back practicing with his familiar Scotty Cameron T5 Proto mallet, but it’s certainly something to keep an eye on going forward.

Daniel Berger’s custom Jailbird site lines

Berger, who’s currently using Odyssey’s Ai-One Mini Jailbird mallet putter, has a unique 3-dot, 2-line alignment on the crown of his navy-white-navy-white mallet putter. Looking down at the putter, it’s easy to see why this alignment system would help; it just seems impossible to set up to the ball off-center, or misaligned to the target.

Also, for anyone worried, you can rest easy. Yes, he’s still playing the 2013 TaylorMade TP MC irons, which we highlighted in our recent “Modern Classics: Old vs. New” video testing series.

FitzMagic teams back up

Brothers Matthew and Alex Fitzpatrick are teaming up once again at the Zurich this year, and Bettinardi Golf hooked them up with some festive “FitzMagic” headcovers to match this week.

See what else is in Alex Fitzpatrick’s WITB here

And, with that, we say goodbye to the Zurich Classic in New Orleans. Don’t forget to check out all of our photos from this week, including 30 unique photo galleries full of equipment photos.

We’ll see you next week in Texas for the 2024 CJ Cup Byron Nelson!

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