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bms0345@pacbell.net
Joined: Feb 2, 2009
Messages: 4
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Jeff,
I noticed that in the data tables of Shafts Listed by DSFI, that none of the tempo or swing length columns match the "standard" DSFI. Yet in the write-up preceding the tables, it implies that the full swing length with fast tempo matches the DSFI formula (use factor of .97 to 1.02).
Why don't the standard DSFI and "Fast Tempo" columns agree?
And by the way, thanks VERY MUCH for continuing to produce this data each year.
thanks,
Brad
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Jeff Summitt
Joined: Jan 13, 2006
Messages: 2541
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Brad:
Is this in the addendum or the catalog? If it is the catalog, the ranges for steel shafts went from medium tempo to 3/4 swing, while the graphite shafts are from slow tempo to fast tempo. The addendum will supercede the catalog in these cases.
Jeff Summitt
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bms0345@pacbell.net
Joined: Feb 2, 2009
Messages: 4
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I was referring to the Shaft Fitting Addenda - in the section of shafts sorted by DSFI. Example from what the table says:
Driver shaft - Aldila Gamer R
DSFI..................85
3/4 Swing..........83
Fast Tempo........88
Medium Tempo...92
Slow Tempo.......98
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Jeff Summitt
Joined: Jan 13, 2006
Messages: 2541
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Brad:
Here is the math:
3/4 swing 85/1.02 = 83
Fast tempo 85/0.97 = 88
Med tempo 85/0.92 = 92
Slow tempo 85/.87 = 98
In reality it is broke down this way, for a 3/4 swing the range is of swing speed or 79-83 (lower end is 85/1.07 = 79). For the fast tempo the range is 83-88, moderate 88-92 and slow is 92-98.
Jeff Summitt
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ron@faulkner.net
Joined: Jan 11, 2006
Messages: 31
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Brad,
Here's how I think of it (and Jeff correct me if I'm off base)...
The DSFI number is exactly what the acronym indicates--an index. The index number doesn't REALLY indicate a swing speed. It's just a way to quantify the results of Jeff's number crunching that converts frequency, tip/butt deflection, resistance to torsional force, etc. to something useful.
It's the multipliers that Jeff lists above that, with some knowledge of a golfer's swing characteristics, converts the index into a useful swing speed.
Of course that number can be tweaked further as clublength and swingweight are adjusted from what Jeff uses as his "standard" for testing, but that's a whole other can-o-worms.
--Ron
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In the bag...
Power Play Q2 10.5*
Jackaroo II 18*, 23*
HC Tour 4h
325L 5i - PW, AW, SW, LW
Design DPII Putter |
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bms0345@pacbell.net
Joined: Feb 2, 2009
Messages: 4
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Jeff and Ron
Been out of town......thanks for the replies.
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