Ed,
Agree
with Mac that CPMs are CPMs, regardless of shaft type. However, the real
issue is playability of different shafts at a given frequency, and that can vary
greatly based on the factors that Mac mentions below. The DSFI and RSSR
systems were developed to try and describe how certain shafts would play
relative to one another, but both systems are far from perfect. Developing
a system that would accurately factor in all of the variables that affect shaft
playability is probably the holy grail of clubmaking.
Tedd
-----Original Message-----Ed,
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 25, 2002 6:35 PM
To: [EMAIL PROTECTED]
Subject: Re: ShopTalk: Steel vs. Graphite CPMs - Rule of Thumb?
CPM equals CPM regardless of steel, graphite, titanium or fiberglass. A steel shaft oscillating at 250 CPM is the same stiffness as a graphite shaft oscillating at 250 CPM, assuming identical measurement methods. If the tip section profiles of the two shafts are different then the two shafts will behave differently. The different weights of the two shafts will also greatly affect the feel of the shafts. This would be equally true of two different graphite shafts of different weights and different tip section profiles but with identical butt section frequency measurements. That being said I don't believe that there is any "rule of thumb" equivalency formula to compare shafts made of different materials.
Rich "Mac" McHattie
Mac's Golf
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