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 Shaft Charts & Fitting

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cjc81
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PostSubject: Shaft Charts & Fitting   Wed Feb 06, 2013 12:24 am

Found this awesome chart comparison over at golfwrx.

http://www.golfwrx.com/forums/topic/496072-new-and-improved-shaft-chart/

And some excerpts from Howard Jones's post on shaft fitting as follows:

#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?

TEMPO
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


TRANSITION
The turning of the club on top of your swing
The more power in use here, stiffer the butt should be.

DURATION
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.

RELEASE timing
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.
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simoner
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PostSubject: Re: Shaft Charts & Fitting   Wed Feb 06, 2013 6:29 am

Very interesting read. Thanks.
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davis.suliman
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PostSubject: Re: Shaft Charts & Fitting   Wed Feb 06, 2013 11:06 am

who does all this type of fitting in sg?
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zakevich
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Join date : 2010-08-19

PostSubject: Re: Shaft Charts & Fitting   Wed Feb 06, 2013 4:41 pm

davis.suliman wrote:
who does all this type of fitting in sg?

I think fitter who use track man is able to track all this. I dont remember flightscope having this tempo function. Correct me if i am wrong.
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zakevich
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PostSubject: Re: Shaft Charts & Fitting   Wed Feb 06, 2013 4:45 pm

cjc81 wrote:
Found this awesome chart comparison over at golfwrx.

http://www.golfwrx.com/forums/topic/496072-new-and-improved-shaft-chart/

And some excerpts from Howard Jones's post on shaft fitting as follows:

#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?


This is important. Informations added to my spreadsheet.

Thank you.
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cjc81
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Posts : 86
Join date : 2011-11-30

PostSubject: Re: Shaft Charts & Fitting   Thu Feb 07, 2013 9:22 am

Found another set of useful numbers for reference.

The computation of ladies carry and male carry is based of slightly different smash factors.

driver swing speed (mph) ladies carry (m) male carry (m)

85 181.83 186.59
90 192.52 197.57
95 203.22 208.55
100 213.91 219.52
105 224.61 230.50
110 235.31 241.48
115 246.00 252.45
120 256.70 263.43
125 267.39 274.40
130 278.09 285.38
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PostSubject: Re: Shaft Charts & Fitting   Today at 10:24 pm

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