Frequency data

[pocketfulladoubles]

sorry if this has been answered before, but how do you convert from frequency in terms of cycles per second or minute to the 5.0, 5.5, 6.0 etc that you find in Project X shafts, or is this not a good comparison. The shorter the shaft, the higher the frequency. What does the 5.5, 6.0... mean?

[clubshack]

The 5.0, 5.5 are shorthand for the actual Cycles per Minute of a "43" golf club". Keep in mind, that there is no 43' club (iron). Every shorter club of the same frequency "label" will have a 4.3 cpm increase for every 1/2 inch that it is shorter than 43". A standard 5 iron is 38 inches. That is 5 inches shorter that their 43" club. 10 ( 1/2 inches) times 4.3 cpm is 43.0 cpm added to whatever the base frequency is. If it is 6.0's then add 260 plus 43 equals 303 cpm.

 

Hope this helps

[pocketfulladoubles]

The 5.0, 5.5 are shorthand for the actual Cycles per Minute of a "43" golf club". Keep in mind, that there is no 43' club (iron). Every shorter club of the same frequency "label" will have a 4.3 cpm increase for every 1/2 inch that it is shorter than 43". A standard 5 iron is 38 inches. That is 5 inches shorter that their 43" club. 10 ( 1/2 inches) times 4.3 cpm is 43.0 cpm added to whatever the base frequency is. If it is 6.0's then add 260 plus 43 equals 303 cpm.

 

Hope this helps

 

 

The 260 comes from 4.3 x 6.0? If I understand you correctly, that would mean for the example of a 37" club and a 5.5 stiffness:

 

(43-37)*2 = 12

12*4.3 = 51.6

51.6*5.5+43 = 327 CPM ?

[Grum]

6.0=260CPM, but is that 260 cpm on a 5 inch clamp or shorter? I ask because take an S300 at 38", 315ish cpm on a 5 inch clamp, that'd work out at 7.7 on the rifle scale with that calculation, when I'd expect it to be nearer 6.0.

[clubshack]

I calculate

 

43-37 = 6 inches or 12 (1/2 inches) X 4.3 = 51.6 CPM added to the 255 = 255 + 51.6 = 306.6 CPM

[MizzyMan]

To calculate your club's stiffness rating, start with the raw cpm's. Say a 42" 5-wood.

 

E.G., cpm's are 265. Subtract the difference from 43" (ref. point) to your club (42" here) in half-inches times 4.3. This would be be 8.6 here. (2x4.3)

 

(265 - 8.6 = 256.4)

 

Subtract 200. (256.4 - 200 = 56.4)

 

Divide by 10. (56.4 / 10 = 5.6.)

 

This would be the stiffness rating. This is what I figured from the info given so far. Any math majors wanna tell me I'm totally off-base? Always wanted to figure out how this works and how I could do it at home w/o one of them charts.

 

P.S. I guess it can work for longer clubs as well. My driver 45" with cpm's of 249.

 

249 + 17.2 = 266.2

266 - 200 = 6.6

 

I guess that's my driver stiffness? Ouch! Maybe too much for me.... :o

[Awalkspoiled]

The numbers are based off the old "standard" length for a driver of 43". A 5.5 43" club will freq at 255, 6.0 at 260, IF YOU USE THE PROPER CLAMP! The Rifle clamp needs to be properly calibrated for the particular stability of your table, but will be between 2.5 and 3". There is no linear way to transfer data based on a 5" clamp, since one end or the other of the clublength range will be distorted. In other words, for a 38" club the difference will be around 17 CPM (DGS 5i is going to measure around 300 on a Rifle clamp) but the difference is greater in the shorter clubs and less on the longer ones. This is why the 8.6 CPM/inch slope is kinda random when matching with a 5" clamp.

 

The scale is also a good first step for comparing shafts of the same design, but really deceptive when comparing different designs. A 5.7 43.5" DGS driver is going to play very differently from a 5.7 45" YS6 driver.

[MizzyMan]

The numbers are based off the old "standard" length for a driver of 43". A 5.5 43" club will freq at 255, 6.0 at 260, IF YOU USE THE PROPER CLAMP! The Rifle clamp needs to be properly calibrated for the particular stability of your table, but will be between 2.5 and 3". There is no linear way to transfer data based on a 5" clamp, since one end or the other of the clublength range will be distorted. In other words, for a 38" club the difference will be around 17 CPM (DGS 5i is going to measure around 300 on a Rifle clamp) but the difference is greater in the shorter clubs and less on the longer ones. This is why the 8.6 CPM/inch slope is kinda random when matching with a 5" clamp.

 

The scale is also a good first step for comparing shafts of the same design, but really deceptive when comparing different designs. A 5.7 43.5" DGS driver is going to play very differently from a 5.7 45" YS6 driver.

 

Good info, thanks.

 

So my "6.6" driver may not be all that out-of-line with my 5.6-5.8 irons?

[Awalkspoiled]

The numbers are based off the old "standard" length for a driver of 43". A 5.5 43" club will freq at 255, 6.0 at 260, IF YOU USE THE PROPER CLAMP! The Rifle clamp needs to be properly calibrated for the particular stability of your table, but will be between 2.5 and 3". There is no linear way to transfer data based on a 5" clamp, since one end or the other of the clublength range will be distorted. In other words, for a 38" club the difference will be around 17 CPM (DGS 5i is going to measure around 300 on a Rifle clamp) but the difference is greater in the shorter clubs and less on the longer ones. This is why the 8.6 CPM/inch slope is kinda random when matching with a 5" clamp.

 

The scale is also a good first step for comparing shafts of the same design, but really deceptive when comparing different designs. A 5.7 43.5" DGS driver is going to play very differently from a 5.7 45" YS6 driver.

 

Good info, thanks.

 

So my "6.6" driver may not be all that out-of-line with my 5.6-5.8 irons?

 

LOL - no,not at all. The scale doesn't work all that well at long lengths but subjectively most people will feel that a 255/45" driver with a typical mid-bend profile is loading as a good match for DGS irons. Assuming you measured your club with the grip on (don't do this if you can help it, even with a 5" clamp - NEVER do it with a 2.5" clamp) you ungripped freq would be right in that area.