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FAQ-How to read/interpret shaft profile data - 07/09/09 8:02:30 AM
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coachsb
Posts: 10,000+
Joined: 09/27/04
From: indiana
Status: offline
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The following is an excerpt from the Shaft Profiler:
Overview of the Shaft Profiling System
The Shaft Profiling System exists to provide the clubfitter and clubmaker with quantifiable information about a shaft's physical characteristics and predicted playing behavior. The end goal is to quickly and accurately fit a golfer with a minimum of effort.
In the past shafts were typically characterized by torque, flex (L, A, R, S, etc.) and/or butt cpms. However, as shaft construction became more sophisticated these designations became meaningless. For example, today's shaft designers can engineer various portions of a shaft to have specific performance criterion, such as "tip stiff". The problem for the clubfitter is that as shafts become more complex the fitting of a golfer becomes more trial and error.
Tom Wishon recognized this problem and began a series of experiments and research that led to the concept of a shaft's "bend profile." What Tom did was divide a shaft into a series of segments (points) and measure the stiffness of that particular section of shaft by use of frequency meter. The frequencies of each point could be plotted and the result was a "bend profile" for that shaft which empirically described that shaft's stiffness.
The Shaft Profiling System builds upon Tom's ideas to:
• provide a database containing the bend profiles of hundreds of shafts from various makers,
• provide the bend profile information in an easy to understand graphical manner,
• search for shafts that meet specific criteria, such as "slightly stiffer than the golfer's current shaft" or "is an economical alternative to the $500 new whizbang shaft on tour",
• graphically compare the profiles of multiple shafts to allow the clubfitter to "see" the differences among the selected shafts,
• provide for the collection of fitting comments for each shaft,
• provide not only for frequency-based profiles, but also for deflection-based profiles,
• provide a mechanism for clubfitters to share bend profiles and fitting comments with others.
How to Read the Graph:
The graph with raw frequencies plotted on the vertical axis does not allow easy interpretation of shaft profile differences. Therefore all charts that I post use a 'reference shaft' from which all other shafts are compared. That way, you can compare a shaft of known playability (e.g. your current shaft) to that of a new or different shaft.
The 'reference shaft' graph has a vertical axis that shows the percentage difference at each zone between the the frequency of the reference shaft (straight horizontal black line) and the frequency of the shaft of interest. The shafts are measured in 5" increments from butt to tip using a 454g chuck with the butt number plotted on the left hand side of the chart, progressing to the tip on the right hand side.
1=41" from tip
2=36"
3=31"
4=26"
5=21"
6=16"
7=11"
2.5% is generally regarded as 'the same' though there can be distinct feel differences between shafts as well as relatively minor performance differences. In other words, you cannot expect an exact match, though the Profiler can get you in close proximity. I tend to look closely at the tip numbers at 6 and 7, especially 6 as that is where much of the shaft bending occurs on the downswing.
Summary:
- % Frequency difference on vertical axis
- horizontal axis = butt on left, tip on right
_____________________________
the best thing a father can do for his children is love their mother
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RE: FAQ-How to read/interpret shaft profile data - 07/24/09 4:26:26 AM
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scotts33
Posts: 9639
Joined: 07/25/01
From: Madison, WI
Status: offline
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Great step in the right direction Steve. Thanks!
Scott
_____________________________
Scott
http://www.clubmakersguild.com/
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RE: FAQ-How to read/interpret shaft profile data - 07/31/09 5:39:54 AM
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scotts33
Posts: 9639
Joined: 07/25/01
From: Madison, WI
Status: offline
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Added these today to shaftprofiles.com
The Graman M-75 is in the new shaft line of Graman. I used it in two fairway wood shafts. Nice shaft and cheap.
Graman M-75 : R/S : 0.000 : 47.00 79 20.75 0.00 249 180.00 202.00 229.00 275.00 347.00 464.00 708.00
Graman M-75 : R/S : 0.000 : 47.00 79 20.75 0.00 250 178.00 203.00 233.00 277.00 344.00 460.00 708.00
Mercury Performance Plus : R/S : 0.000 : 46.50 75 23.25 0.00 252 181.00 210.00 247.00 291.00 362.00 475.00 672.00
Mercury Performance Plus : R/S : 0.000 : 46.50 75 23.25 0.00 252 180.00 210.00 247.00 293.00 362.00 479.00 682.00
Mercury Performance Plus : R/S : 0.000 : 46.50 76 23.25 0.00 252 180.00 210.00 247.00 293.00 362.00 476.00 688.00
_____________________________
Scott
http://www.clubmakersguild.com/
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RE: FAQ-How to read/interpret shaft profile data - 08/06/09 6:27:23 PM
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ValueGolf2
Posts: 216
Joined: 03/15/04
Status: offline
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The above instructions say:
"The shafts are measured in 5" increments from butt to tip using a 454g chuck with the butt number plotted on the left hand side of the chart, progressing to the tip on the right hand side"
To clarify this, the butt CPM's (the first number, or the number on the left in the graphs) is taken with a 205g weight, not a 454g. All other readings, starting with the 41" reading are taken with a 454g.
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Dave
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RE: FAQ-How to read/interpret shaft profile data - 08/25/09 7:10:56 PM
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scotts33
Posts: 9639
Joined: 07/25/01
From: Madison, WI
Status: offline
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You'll need a CSFA or some type of V-Block to take frequency shaft profile readings as shaft gets smaller towards tip.
_____________________________
Scott
http://www.clubmakersguild.com/
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