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How the idea of shaft frequency began

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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.’”

Manchester_Lane_Robot

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

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 is the owner of Golf Placement Services, a boutique business which aims to apply his background in golf and higher education to help educate players, their families and coaches about the process! Website - www.golfplacementservices.com Insta - golf.placement.sevices Twitter @BMRGolf

13 Comments

13 Comments

  1. 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.

  2. 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.

  3. 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.

  4. Ned

    Jun 6, 2017 at 8:06 am

    Brunswick Golf developed the Frequency Matching System in 1981!

    • Rico

      Jun 6, 2017 at 4:04 pm

      The article states that the Braly’s submitted a patent for “Frequency Matching” in 1977.

  5. 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?

    • Skip

      Jun 7, 2017 at 1:18 pm

      SST pure is pure Kool-Aid. Drink it if you so choose.

  6. 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.

  7. Charles Bartholomew

    Jun 5, 2017 at 3:38 pm

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

  8. 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.

    • 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.

  9. artie j

    Jun 5, 2017 at 6:59 am

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

  10. SH

    Jun 4, 2017 at 10:25 am

    Yup, awesome

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Whats in the Bag

Justin Thomas’ winning WITB: 2019 BMW Championship

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Driver: Titleist TS3 (9.5 degrees)
Shaft: Mitsubishi Diamana BF 60TX

justin-thomas-witb-driver

3-wood: Titleist TS3 (15 degrees)
Shaft: Mitsubishi Tensei CK Pro Blue 80TX

5-wood: Titleist 915FD (18 degrees)
Shaft: Fujikura Motore Speeder VC 9.2 Tour Spec X

Irons: Titleist T100 (4), Titleist 718 MB
Shafts: True Temper Dynamic Gold Tour Issue X100

Wedges: Vokey Design SM7 (46, 52, 56 degrees), Vokey Design SM6 (60 degrees)
Shaft: True Temper Dynamic Gold Tour Issue S400

Image via Vokey’s Aaron Dill

Putter: Scotty Cameron X5

Grip: SuperStroke Pistol GT Tour

Ball: Titleist Pro V1x

Grips: Golf Pride Tour Velvet Cord

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Equipment

Forum Thread of the Day: “Best ball for players with slower swing speeds?”

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Today’s Forum Thread of the Day comes from ghoul31 who created a thread dedicated to finding the ideal golf ball for players with slower swing speeds. Our members have their say on what is the ball most suited to slower swing speeds, with a variety of models receiving a mention.

Here are a few posts from the thread but make sure to check out the entire discussion and have your say at the link below.

  • Hogan9: “My SS is 80 to 85. I play the Titleist AVX. Many people on these forums tell it’s wrong for me. I’ve tried several brands and types over the last year ( Pro-V-1 and 1X, Cally Supersoft and Chrome Soft, TM TP5X, Wilson Duo Soft and the Snell MTB. The AVX gives me the best overall performance for my game. I’ve had to slightly adjust to how it reacts on chips and pitches, but the extra distance off the tee is well worth it. “
  • North Butte: “Maybe 90mph driver swing on a good day. Driver 205-ish hit 6-iron from 150. Pro V1x but I have played AVX, B330, TP5 with pretty much similar results to my favorite V1x. Also played the Chrome Soft for a while but it seemed to fly a little low and sometimes have trouble holding greens (or maybe I just didn’t give it a long enough chance to know for sure).”
  • Hat Trick: “Pro V1X – Spin and higher launch keeps it in the air longer, but at the same time that spin holds the greens – SS 96-98 mph.”
  • Kmac: “My SS is right around 95-100, and I find the QST to the perfect for my game. I will also play the AVX or Chrome Soft Truvis. But for the money, nothing beats the QST.”

Entire Thread: “Best ball for players with slower swing speeds?”

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Equipment

Forum Thread of the Day: “Single length irons stunting development?”

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Today’s Forum Thread of the Day comes from rbark11 who has sparked an interesting debate over single length irons in our forums. Rbark11 has been playing single length irons for the past seven months, and he is concerned that he may have issues changing back to regular length irons. Our members give their take on the matter, as well as discussing single length irons in general.

Here are a few posts from the thread, but make sure to check out the entire discussion and have your say at the link below.

  • mcs4: “No, it will not. Both my father and I are currently playing Cobra One Length irons after decades of playing variable length irons. It took both of us maybe a few rounds to feel comfortable with the switch. This weekend I played a round with my old irons, and it was different but not a big deal. My opinion is that there are pros and cons with each approach, but I don’t think picking one will make any particular negative impact on your ability to later switch to the other.”
  • Quadra: “I’ve played both. Right now I am back to VL clubs ( Wishon 560 irons). Find VL gives me more shot-making options. With uneven lies, especially with the ball above or below foot level, the shot seems easier with a more upright or flatter lie, rather than trying to manipulate a shot from clubs with only a single length/lie. VL = more shot possibilities.”
  • Aucaveman: “I played Cobra ftbo for a year. Shot my best scores ever. Our club switched to Mizuno exclusively, so I had my first real fitting. I switched to the 919 forged and had to sell the Cobras to fund the mizunos. Really wished I hadn’t. I really liked the Cobras. The shafts in the Mizuno’s are better suited for me but had I put the same shafts in the Cobras; I’d prob been better off. At some point, I’ll prob do it and go back to one lengths. I was perusing eBay yesterday actually.”
  • Brandons68: “I think that the consistency you gain from SL irons is pretty great. I have not played them personally, but have talked to several people that have, and they really like the feel of the irons and the fact that they swing every iron the same because they are all the same length.”

Entire Thread: “Single length irons stunting development?”

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