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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- Kris Kim what’s in the bag accurate as of the CJ Cup Byron Nelson. More photos from the event here.
Driver: TaylorMade Qi10 (9 degrees @7)
Shaft: Mitsubishi Tensei 1K White 60 TX
3-wood: TaylorMade Qi10 Tour (15 degrees @13.5)
Shaft: Mitsubishi Diamana WB 73 TX
Irons: TaylorMade P770 (2, 4), TaylorMade P7MB (5-PW)
Shafts: Mitsubishi Tensei 1K White 80 TX (2), Nippon N.S. Pro Modus3 Tour 120 X
Wedges: TaylorMade MG4 (50-09SB, 56-12SB, 60-11TW)
Shafts: Nippon N.S. Pro Modus3 WV 125
Putter: TaylorMade Spider Tour
Grips: Golf Pride Tour Velvet Cord
Check out more in-hand photos of Kris Kim’s equipment here.
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TaylorMade is continuing its UDI/DHY series with the successor to the Stealth UDI and DHY utility irons: PUDI and PDHY (which the company styles as P·UDI and P·DHY). TaylorMade is folding the designs in with its P Series of irons.
TaylorMade outlined the process of developing its new utilities this way. The company started with the data on utility iron usage. Not surprisingly, better players — i.e. those who generate more clubhead speed and strike the ball more precisely — were found to gravitate toward the UDI model. DHY usage, however, covered a wider swath than the company might have expected with six-to-18 handicappers found to be bagging the club.
TaylorMade also found that the majority of golfers playing UDI or DHY utilities were playing P Series irons at the top of their iron configurations.
Can you see where this is going?
Matt Bovee, Director of Product Creation, Iron and Wedge at TaylorMade: “As we look to the future, beyond the tech and the design language, we are excited about repositioning our utility irons into the P·Series family. P·UDI is an easy pair for players that currently play P·Series product and P·DHY is an extremely forgiving option for players of all skill levels. It is a natural fit to give these players the performance in this category that they are looking for.”
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TaylorMade PUDI
TaylorMade PUDI technology cutaway (via TaylorMade)
Crafted with tour player input, TaylorMade sought to develop a confidence-inspiring utility iron that blends with the rest of the P Series irons. Also of note: Interestingly, the PUDI has a more compact head than the P790.
In comparison to past UDI products, the PUDI has a more traditional iron shape, slimmer toplines, and less offset with a little of the backbar visible at address.
TaylorMade PDHY
TaylorMade PDHY tech cutaway (via TaylorMade).
Larger in profile than the PUDI, the PDHY seeks to position center of gravity (CG) lower in the club for ease of launch. The toe height is larger and the profile is larger at address — roughly five millimeters longer than PUDI — the sole of the club is wider for improved forgiveness.
Club Junkie’s take
Golfers who feel like they are missing something at the top of the bag could find the PUDI or PDHY a great option. The look of the PUDI should fit the most discerning eye with a more compact look, less offset, and a thinner topline. If you want a little more confidence looking down the P-DHY will be slightly larger while still being a good-looking utility iron.
For being small packages both models pack a pretty good punch with fast ball speeds, even off-center. The feel is soft and you get a solid feel of the ball compressing off the face when you strike it well. Your ears are greeted with a nice heavy thud as the ball and club come together. The PDHY will launch a little higher for players who need it while the PUDI offers a more penetrating ball flight. Both utility irons could be the cure for an open spot in the top end of the bag.
PUDI, PDHY, or Rescue?
TaylorMade offers the following notes to assist golfers in filling out their bags:
- PUDI has mid-CG right behind the center face to create a more penetrating mid-to-low ball flight
- PDHY has a lower center of gravity to produce an easier-to-launch mid-to-high ball flight.
- Both PUDI and PDHY are lower-flying than the company’s hybrid/Rescue clubs.
- PUDI is more forgiving than P790.
- PDHY is the most forgiving iron in the entire TaylorMade iron family
Pricing, specs, and availability
Price: $249.99
At retail: Now
Stock shafts: UST Mamiya’s Recoil DART (105 X, 90 S and 75 R – only in PDHY)
Stock grip: Golf Pride’s ZGrip (black/grey)
PUDI lofts: 2-17°, 3-20°, 4-22° in both left and right-handed
PDHY lofts: 2-18°, 3-20° and 4-22° in both left and right-handed
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Equipment
Coolest thing for sale in the GolfWRX Classifieds (5/3/24): Scotty Cameron Champions Choice 2.5+ putter
At GolfWRX, we are a community of like-minded individuals that all experience and express our enjoyment of the game in many ways.
It’s that sense of community that drives day-to-day interactions in the forums on topics that range from best driver to what marker you use to mark your ball. It even allows us to share another thing we all love – buying and selling equipment.
Currently, in our GolfWRX buy/sell/trade (BST) forum, there is a listing for a Scotty Cameron Champions Choice 2.5+ putter
From the seller: (@wwcl): “Has been gamed as pics show. 33.5 includes original h/c and grip. $575 includes shipping and PP fees.”
To check out the full listing in our BST forum, head through the link: Scotty Cameron Champions Choice 2.5+ putter
This is the most impressive current listing from the GolfWRX BST, and if you are curious about the rules to participate in the BST Forum you can check them out here: GolfWRX BST Rules
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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