Equipment
How the idea of shaft frequency began
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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Equipment
Why Rory McIlroy will likely use the new TaylorMade BRNR Mini Driver Copper at the RBC Heritage
Although we spotted Rory McIlroy testing the new TaylorMade BRNR Mini Driver Copper last week during practice rounds at the Masters, he ultimately didn’t decide to use the club in competition.
It seems that will change this week at the 2024 RBC Heritage, played at the short-and-tight Harbour Town Golf Links in Hilton Head.
When asked on Wednesday following his morning Pro-Am if he’d be using the new, nostalgic BRNR Copper this week, McIlroy said, “I think so.”
“I like it,” McIlroy told GolfWRX.com on Tuesday regarding the BRNR. “This would be a good week for it.”
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According to Adrian Rietveld, the Senior Manager of Tour at TaylorMade, the BRNR Mini Driver can help McIlroy position himself properly off the tee at the tight layout.
Here’s what Rietveld told GolfWRX.com on Wednesday:
“For someone like Rory, who’s that long at the top end of the bag, and then you put him on a course like Harbour Town, it’s tough off the tee. It’s tight into the greens, and you have to put yourself in position off the tee to have a shot into the green. It kind of reminds me of Valderrama in Spain, where you can be in the fairway and have no shot into the green.
“I’m caddying for Tommy [Fleetwood] this week, so I was walking the course last night and looking at a few things. There’s just such a small margin for error. You can be standing in the fairway at 300 yards and have a shot, but at 320 you don’t. So if you don’t hit a perfect shot, you could be stuck behind a tree. And then if you’re back at 280, it might be a really tough shot into the small greens.
“So for Rory [with the BRNR], it’s a nice course-specific golf club for him. He’s got both shots with it; he can move it right-to-left or left-to-right. And the main thing about this club has been the accuracy and the dispersion with it. I mean, it’s been amazing for Tommy.
“This was the first event Tommy used a BRNR last year, and I remember talking to him about it, and he said he couldn’t wait to play it at Augusta next year. And he just never took it out of the bag because he’s so comfortable with it, and hitting it off the deck.
“So you look at Rory, and you want to have the tools working to your advantage out here, and the driver could hand-cuff him a bit with all of the shots you’d have to manufacture.”
So, although McIlroy might not be making a permanent switch into the new TaylorMade BRNR Mini Driver Copper, he’s likely to switch into it this week.
His version is lofted at 13.5 degrees, and equipped with a Fujikura Ventus Black 7X shaft.
See more photos of Rory testing the BRNR Mini here
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It seems like the RBC Heritage is full of new gear to be spotted, and you can add TaylorMade’s P-UDI utility irons to that list.
We spotted a 17-degree P-UDI 2-iron in Nick Dunlap’s bag yesterday, and now have some photos of both the 3- and 4-irons. Nick has his P-UDI 2-iron setup with a Project X HZRDUS Black 4th Gen 105g TX shaft.
From what we can tell, this new P-UDI utility iron looks to have some of the usual TaylorMade technology as we can see the Speed Slot on the sole of the club for additional face flexibility. A toe screw is usually used to close off the hollow body design that will probably be filled with a version of TaylorMade’s Speed Foam that is present in the current iron lineup. This hollow body, foam-filled design should offer additional ball speed, soft feel, and sound, as well as an optimized CG for ball flight.
“Forged” is etched into the hosel, so we can assume that either the face, body, or both are forged for a soft and responsive feel. The club looks good from behind and at address, where we can see just a little offset and a topline that I would consider medium thickness. We don’t have the full details on what is under the hood or how many loft options will be available yet.
TaylorMade P-UDI 3-iron – 20°
TaylorMade P-UDI 4-iron – 22°
- Check out the rest of our photos from the 2024 RBC Heritage
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- Collin Morikawa what’s in the bag accurate as of the RBC Heritage. More photos from the event here.
Driver: TaylorMade Qi10 LS (9 degrees)
Shaft: Mitsubishi Diamana D+ Limited 60 TX (45 inches)
3-wood: TaylorMade Qi10 (13.5 degrees)
Shaft: Mitsubishi Diamana D+ Limited 80 TX
5-wood: TaylorMade Qi10 (18 degrees)
Shaft: Mitsubishi Diamana D+ Limited 80 TX
Irons: TaylorMade P770 (4), P7MC (5-6), P730 (7-PW)
Shafts: True Temper Dynamic Gold Tour Issue Mid 115 X100 (4-6), True Temper Dynamic Gold Tour Issue X100 (7-PW)
Wedges: TaylorMade MG4 (50-SB09, 56-LB08), TaylorMade MG4 TW (60-TW11)
Shafts: True Temper Dynamic Gold Tour Issue S400
Putter: TaylorMade TP Soto
Grip: SuperStroke Zenergy Tour 2.0
Grips: Golf Pride Z-Grip Cord
Ball: TaylorMade TP5x
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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.
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.
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.
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.
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.
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.
Charles Bartholomew
Jun 5, 2017 at 3:38 pm
Interesting article. A little history lesson now and then is a good thing.
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.
artie j
Jun 5, 2017 at 6:59 am
I didn’t know the backstory. Very cool article Ryan
SH
Jun 4, 2017 at 10:25 am
Yup, awesome