Im sorry for not following up this tread, and all the questions to me in it, but many of them cant be answered by me.
KBS 90 shafts
They dont tell about FCM values on the 90 series at the KBS web page, and im not a KBS dealer, so i dont have this shafts around to measure them myself. If someone done some readings on those, put them up with all numbers the actual club got while tested, but please NO GRIP. Its the only way i can add them to the chart
KBS shafts in my chart is adjusted with 1 cpm DOWN from KBS own chart.
The reason is that both DG and PX values is with swing weight D3, while KBS official chart is with D2
Raising SW 1 point, gives 1 cpm flex drop.
The same goes for NIPPON shafts, I dont deal with them either, and they use flex board them self, so no CPM numbers are available from Nippon. If anyone got some numbers, please upload
DG Black Gold
Comming in next version. Numbers will be converted to match the same club specs as for the others.
Flighted VS standard in flex
Go up one flex class (6.0 to 6.5) if flighted is wanted. They want be the same, but close
Remember that weight of shafts goes up in the long irons when you choose Flighted. Good for some, not for others
Going longer or shorter
The chart im working on, also has a row for different playing lengths
Different bend profiles acts different when we go longer or shorter.
With the same heads, DG looses about one hole flex class at plus 1.5 inch,
X100 becomes the flex of S300, while PX 6.0 becomes PX 6.4 so they go completely different ways when we go longer. Thats why its important to have the same chart, but with variables for playing length, since that might turn the hole picture upside down.
FCM charts VS feel and ball flight
Again, FCM charts is not made to compare feel of flex, or Bend profile / Shaft behavior
Depending on your own swing mechanism, 1 bend profile respond better to your swing than others.
Analyzing your swing, and from those parameters choosing the best bend profile is still a job to be done, and this chart want help much in that matter, but we need a place to start it all, and thats where this chart comes in.
Butt CPM tells about the stiffness of the butt.
This section of the shaft is chosen from Club speed, adjusted for swing mechanism PRE impact.
If EVERY parameter from the players swing is MEDIUM, we START shaft testing from this values.
#6 IRON CLUB SPEED / FCM
70 MPH / 4.0
Add 1 cpm for each mph Club speed
80 MPH gives 5.0
90 MPH gives 6.0
100 MPH gives 7.0
All this with MEDIUM parameters from the swing, but what do we look for in the swing, and how do we adjust?
The time from address to impact
We might split them up in 3 time zones
Less than 0.8 seconds is FAST - STRONGER FLEX
Between 0.8 to 1.2 is MEDIUM -
More than 1.2 is SLOW - WEAKER FLEX
TEMPO is also a parameter for shaft weight.
A heavy shaft might be used to smooth out a strong players tempo and timing
The turning of the club on top of your swing
The more power in use here, stiffer the butt should be.
The length of your swing influence on how much you accelerate in your down swing
2 players with the same club speed, and the same release timing, where one of them only uses 3/4 Swing duration, needs different flex strength. The one with 3/4 of a swing has a shorter "drag strip" down to his release, so he is more power full than the other on this parameter.
DOWN SWING ACCELERATION
No matter duration, still pay attention to this. More power from the top down to release, more butt CPM strength is needed.
This are the factors from then players swing PRE impact i adjust for to find a good place to START shaft testing
The parameters above, sometimes moves us 10 cpm or more from MID/Club speed recs up or down, because we dont load the same way. One player might be smooth as butter when swinging his clubs, while another seem to be running on nuclear power all the way but they end up with the same club speed. That means TOTALY different flex needs, where club speed VS flex becomes 0/ZERO on the chart. One need stiffer, the other softer.
Now we need something else than the chart above.
Depending on your release timing, the shaft tip stiffness is the place to look at.
The chart above ONLY gives info on BUTT stiffness, NOTHING about the tip
Thats why we cant use it to judge high, medium or low ball flight, or spin or feel for that matter.
A good club maker will know the differences between this options, and what might be a good fit for you butt still, the 2 most important factor of them all, cant be found in any charts, and that is : How does this shaft plays in your hands with the club head you chosen to play, and how do you like it ?
Your own preference for feel, might dismiss a lot of the math above, so this is ONLY helping numbers for a place to START. testing
So the chart ive made, is ONLY for navigating in the need for BUTT CPM strength, due to PRE impact flex needs, combined with WEIGHT
MY word of advice for flex
There are different camps and opinions when the question about soft or stiffer is better comes up
Since its the way the club head is delivered to the ball that makes the "numbers", we cant improve by going up or down, when we found optimum. BUT there are a few thing that you might find useful to know.
A shaft TO STIFF, will take away from you, valuable information from feed back about how the shaft itself is working during the swing. The stiffer it gets, the more of this info you loose. Much to often ive seen players choosen a shaft so stiif, that they have to "step on it" to make it work. Its no good for scoring if you start out with a shaft like that. You will over play, and burn out yourself for energy, before hole 18.
Choose a shaft that not only performs good for you, and feels good at impact, but choose the shaft with a flex and bend profile who gives you the best feel of how the shaft works during the hole swing. This is the club you will play the best with. You improve control of the club by choosing right here.
I look forward to upload a better chart than above, and if anyone got numbers for Nippon, KBS 90, or any shaft not mentioned, feel free to apply the numbers here, but remember to tell ALL specs on the club tested, so the numbers can be converted right to get into the chart
This numbers is whats needed if i shall be able to use the numbers, and fit them into the chart
Edited by Howard Jones, 24 December 2011 - 02:45 AM.