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Golf: Science of the golf shaft

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  • "Frequency is useful as a measure of shaft stiffness, but don't read too much into it. For instance, it is not an indicator of the "free response" of the shaft during the downswing."


If someone tried to measure my shaft stiffness during the downswing, there would definitely be a free response

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Sounds like you need to work on your release(s) ;)


BTW the shaft tip gets extremely excited in microseconds upon impact so understanding and perfecting tip stiffness and mid-shaft stiffness are paramount.

Too soft is always bad. Always go more stiff when in doubt. Spraying long shots all over the place is for LOSERS. Sharps know the key is to hit desired targets accurately and repeatedly.

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Full books free, available in pdf chapters.


2016 annual shaft data is full of more shaft specs than you can find anywhere. Great reference.




The Modern Guide To Shaft Fitting, 2nd Edition, 2000

Originally published in 1992, "The Modern Guide to Shaft Fitting" is the book that changed the way clubmakers (and for much of the golf industry) view golf shafts. The "Modern Guide to Shaft Fitting" verified what clubmaker's long suspected, that shaft specifications that were thought to be the same are not comparable at all. In 1989, Dynacraft Golf (now a Hireko brand), in a joint venture with the shaft company Apollo Golf, embarked on a project to test various shaft specifications under one single set of testing conditions. The tests would reveal variations in testing methods and labeling flex, torque, bend point, kick point, etc.

"The Modern Guide to Shaft Fitting" goes in-depth on each of the various shaft parameters, plus ties it all together using the most innovative shaft fitting system ever created, the Dynamic Shaft Fitting Index. The DSFI is a mathematical formula for shaft stiffness, based on the measured frequency and torque of a shaft, and then equates it into a player's swing speed. If you want to truly learn about shafts and shaft fitting, then second edition of "The Modern Guide to Shaft Fitting" is a must read. The latest edition is partially re-written to reflect on what we have learned the past eight years.

If you are having any problems downloading these files, please email us. We can also email the chapters to those that are having trouble downloading.





2016 Shaft Fitting Addendum
The 2016 version of the annual Hireko trademarked shaft testing project provides up-to-date measurements of thousands of shafts. Included are technical measurements of raw and cut weights, frequencies, torques, balance points and recommended swing speed ranges for each shaft. Included is an explanation of how to use the Dynamic Shaft Fitting Index (DSFI) in total club fitting applications. Written by Jeff Summitt.

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