Best Shaft Flex Slope System?

QUESTION: Hello,

Is there any data or published articles comparing the dispersion patterns from a
one number ( flat ) frequency set of irons, and set of golf clubs compared to a
sloped curve ( each club has a higher frequency number ) frequency set? I have
had people claim to me that a steep slope curve is better than a shallow slope
compared to a horizontal or flat curve, and depending upon who is trying to sell
me clubs claiming that this ne is better because of blah, blah, blah. It makes
sense to me that there would be an "Iron Byron" based study to actually quote
data from and settle the argument. I am biased because I have been playing a
one # frequency set for the past 4 sets of clubs, but would actually like to see
some hard published scientific study type data to support one method or another.

Thanks, OFG,

ANSWER: Hi OFG,

The answer to your question is quite easy- “It depends on the golfer”.

Different installation methods with regards to butt frequency slope variations will meet with varying levels of success based on the golfers swing, how they feel the club when they swing, and their past experience.

(For background information to other readers of this Q&A- most every iron set is built to a certain flex, such as REGULAR or STIFF, but each club in the set will measure on a shaft butt frequency meter, progressively stiffer. as you move from the #3 iron to the PW. However, there are some iron sets that are offered by clubmaking shops, that will measure on a shaft butt frequency meter to be the same raw stiffness. If these meter numbers are plotted on a graph, the traditional set will have a line that is moving upward, or a “steep slope”, and the same raw stiffness set will thus have a line that is the same, or a “flat slope”.)

Moving back to our discussion -in simplest terms, most golfers swing with different amounts of “strain” on the shaft for different clubs. This is partly because they have learned to swing based on a steeper frequency type slope. This is also because this is what they have found feels best to them. Other golfers, typically who have the same length backswing, and exert the same amount of force or strain on the shaft, from their long irons to their short irons, prefer a flatter, single frequency type slope.

Neither system is right or wrong. Adjusting the slope, or relative shaft butt stiffness from club to club, is actually a fitting tool than can be used to match an overall shaft flex scheme to the type of golfer.

The discussion is also a “chicken or the egg” type argument. It can be argued that most golfers should play with a traditional steep slope because their swings dictate this. It can also be argued that most every golfer uses a steep slope set only because that is the system that their swings learned on and thus are based on. Maybe if everyone learned how to swing and play with a flat-line slope, when they first played the game, the steep slope users would be in the minority.

Doing an “Iron Byron” test would not yield any good data as to the preferred method since a robot type device would only be measuring which slope type would be best for the type of swing that you chose for the robot.

My best recommendation is to play with both type of sets, and make your conclusion based on the following statement- “Which set allowed you to swing in the most efficient, natural, and comfortable manner, without the need to adjust or manipulate your swing?”.

Regards, Mark

Optimize Distance via a Professional Assessment

QUESTION: Hi,

I have a Callaway FT-iz driver, 8.5 loft, and a neutral head. I have a Fubuki
shaft and an Ozik X-CON 5 shaft. I have a swing speed that ranges from 105-115
mph and I hit the ball solid most of the time. I am losing distance. I don't hit the ball high. I am wondering what I might try to increase my distance. I don't like a shaft that is too stiff or heavy, but when
I go softer, my spin goes up and my flight comes down. Anyone have any shaft
ideas for me? Thank you, JL


ANSWER: Hi JL,

There is no accurate formula for a given shaft based on your trajectory and swing speed. For a true determination of your shaft and for optimization of your distance, you are best to undergo a driver fitting assessment.

Your email is like the following example:

"I am in good health, and I have tried a few different supplements, but I am losing stamina. My temperature is good, and my strength is good, What supplement should I take?"

I am sure you would recommend that this person goes beyond a random guess and undergo some type of examination by a health professional to determine the condition of the patient, the causes of the loss of stamina, and what is the best course of action.

Likewise, if you are losing distance, I would recommend a driver fitting assessment to optimize both FEEL and FLIGHT.

The goal of a professional driver fitting assessment is to determine which equipment combination allows us to achieve both the most "EFFICIENT FLIGHT GEOMETRY" and the "OPTIMAL CLUB INTERACTION". Efficient Flight Geometry means which ball flight will achieve the best combination of flight and roll, which in the case of the driver club means the most distance. Optimal Club Interaction means which club will allow our body and swing to perform in the most efficient manner, without the need for compensation or concession.

Thus, a driver fitting assessment includes a comparison of different lofts, head styles, shaft models, flexes and installation specifications, a measurement of the ability to deliver the club to the ball in an efficient manner, and a tracking of which combination yields the best flight geometry.

If you are married to one head, and one loft, and are searching for the best shaft model to go along with this head/loft, you are offering yourself limited options. If you open yourself to a whole world of options, you will find your optimal distance.

Best regards, Mark

TRUE Education on Shaft Frequency Measurement

QUESTION: Hi Mark,

I am a small club builder working out of my garage and I am interested in
putting a Nippon steel shaft in a Taylor Made Burner Driver. I think a stiff
shaft that produces somewhere in the neighborhood of 260 cycles per minute. Do
you have something near that and how much will it cost?

Thanks, Bob


ANSWER: Hi Bob,

Thanks for sending in your note.

You might consider our NS PRO 950FW Series of premium steel shaft models designed for drivers and fairway metals. These are available exclusively via our Authorized Nippon Shaft Installation Centers. Their contact information is available at www.shaftology.com.

Regarding a shaft that "produces somewhere in the neighborhood of 260 cycles per minute", please let me offer a bit of true clubmaking education.

1) "260 cycles", at first sounds like a very precise stiffness rating, however, in the real world, it represents a huge, wide, expansive, very large range of stiffness ratings.

2) What is required is some background info to achieve a more precise language and thus a more precise rating.

3) Because of the variability of the frequency meter machine and its shaft clamp, clamp pressure, base, head weight, grip on or off, etc., and even technician, a given rating, say 260CPM, can represent a stiffness rating of a Senior Flex, Medium Flex, Stiff Flex, or Extra Stiff Flex, or any of the in-between sub-flexes.

4) Because a frequency machine is measuring the "butt frequency" or relative butt stiffness of a given shaft, and not the TOTALITY of how a shaft will play with regards to flex or stiffness, a 260 CPM can represent a stiffness rating of a Senior Flex, Medium Flex, Stiff Flex, or an Extra-Stiff Flex, or any of the inbetween sub-flexes.

5) These variations occur because, for example, some models are very stiff in the butt section, but then very flexible in the mid and tip sections, versus a model that is very stiff in the butt section, and then very stiff in the mid and tip sections. This results in a similar stiffness CPM "rating", but is not at all representative of the stiffness "playability" of the two shaft models.

6)If you realize now the number variations that are in play, you understand that "260 CPMs" is only a raw rating of a given machine, a given measurement methodology, and a given shaft.

7) The next realization therefore, is that comparing this raw number to another raw number, derived from a different machine, different measurement methodology, and different shaft geometry offers no value in comparison.

8) So what is the value of these measurements? My best recommendation is to use a frequency machine and the raw values to compare and evaluate the relative stiffness of one series of shaft models.

9) For example-

Let's say you have an NS PRO 950FW 'S' flex shaft installed in your driver, with specifications of 44" length, D2 swingweight, a standard Lamkin Crossline grip, and the raw frequency value is 260. And let's say that you play with this combination and it feels too flexible, you have a hard time adjusting to the flex, and thus your shot pattern and face contact is erratic.

Next, you have an NS PRO 950FW 'X' flex shaft installed into your same driver, with the exact same specifications, and the raw frequency value is 272. We know that this raw frequency number is of great comparison value since we are using the same machine, same measurement methodology, and same shaft geometry, thus the difference in the CPM value is a direct representation of the actual flex value as compared to the previous club.

Let's say this club feels too stiff, and plays quite "dead", meaning that they only way to get this shaft to play OK is to swing in a jerking motion to get the shaft to flex and thus feel like there is some life to it.

If the stiff club played approximately a half of a flex too flexible, and the x-stiff club played approximately a half of a flex too stiff, and the other specifications of length and weight seemed optimal, then it would be accurate to assume that building a driver with a raw flex value of 266, to the same specifications, would perform excellent.

10) Many newer clubmakers want a simple, one factor, "take my temperature to diagnose my health" approach, to shaft selection, but what is required for best performance and most enjoyment, is a blend of the art and the science of clubmaking.

Regarding the cost of the NS PRO 950FW shaft series, please contact any of our Authorized Centers. The pricing is certainly dependent upon the fitting and installation services offered.

Best regards, Mark

PGA TOUR Data Tells A Story

The above data lists the averages of the Tour Players that were recorded by the TRACKMAN Company. The TRACKMAN is the elite doppler radar system used on the PGA Tour to record both clubhead and golf ball flight data.

What story does the data tell? And what can I learn from this data?

First, as if you didn't already understand this- the PGA Tour Players are quite powerful and quite consistent. If you look at their carry distances with their irons and their distance gaps, you see that not only do they hit their irons a long way, but they have fairly consistent distance gaps between their clubs. This distance gapping allows them the best chance at distance control by having more full swing type shots into the greens. Most of us regular golfers do not have such uniform gaps between our clubs and we do not even have an accurate assessment of how far each of irons and wedges go.

With the advent of GPS and Laser Distance tools, we have at our fingertips, the ability to measure and learn both our distances of each of irons and wedges, and thus have the same information as the Tour Players. And if we take the necessary steps to adjust our irons, we can have uniform distance gaps between clubs, just like the tour professionals.

The second powerful piece of data is regarding the driver attack angles of the PGA Professionals. It is a reality that a more positive angle of attack, in the 3 to 4 degree range, leads to greater driver distance, yet the PGA Tour average is negative 1.9 degrees. This happens because the tour players are not really super concerned about squeezing every last yard out of their games/swings. In fact, the PGA Tour, especially with the advent of lesser grooved geometry irons, is more and more about driver control. Swinging on an upward angle creates the ability for the ball to launch higher and spin less, and thus gaining more distance, but it is a different swing than the tour players "normal" swing, and not every player can be as accurate when they choose this swing variation. It is a distance/control trade-off, that most Tour Players can not reconcile.

Yet, if you look at the same data from the LPGA Tour, you will see the driver attack angle number jump to a positive 3 degrees. The LPGA Players are shorter hitters than the men's tour and the distance/control tradeoff is a benefit to the majority of the players.

All of us regular players, meaning any player who needs more yardage, would be best served if we learned, preferably with the help of a TRACKMAN system, and/or a good instructor, how to adjust our natural swing so as to make a positive angle of attack with our driver. The extra yardage for most, is well worth the time and expense invested in achieving a more efficient driver attack angle.

Shaft Inserts to Reduce Impact Vibration?

QUESTION: Hi,

Do you feel the playability of the 950GH Nippon Shaft would be effected by
adding Sensicore inserts? I want to play light weight steel shafts, but need the
shock absorption of graphite. Sensicore inserts are sold seperate and can be
inserted into the shafts.

Thanks, Don
ANSWER: Hi Don,

I think it’s a great idea for your needs.

Inserts will add a small amount of weight, and also remove some of the good feel from your set, which is not perfectly ideal, but if the vibration of impact is keeping you off the course, a small bit of extra weight and minor loss of feel is well worth it. To accurately determine the effect on playability, you might consider installing the inserts into one or two of your shafts and comparing the weight and feel to your other clubs in terms of the feel and weight of impact.

Here are a few other comments;

1) My opinion is that any insert into a shaft will reduce the vibration of impact, but will also rob some of the “feel” of impact. For golfers who couldn’t play without some extra shock absorption, this is a good tradeoff.

2) Play with a head that has some shock dampening qualities. Many heads are moving in this direction. However, you must test and compare different models to determine what works for you, but some great models include many of the Cleveland and Callaway iron models.

3) To alleviate stress and strain on our bodies and swings, it is critical to insure that all specifications of your clubs are fitted and installed to allow you to swing in the most natural, comfortable and efficient manner for your body. If your set is off with regards to weight, lie, length, flex, grip, etc., then you will be forced to twist and contort your body in an effort to make your set work optimally.

Regards, Mark