Adding weight to the head-cpm variation

[Chieflongtee]

10 grams added to the head equals a 5 cpm variation in frequency i.e 1/2 half a flex.

+- 1/4 hosel depth= 2cpm

+- 2 grams head weight=1 cpm

[BC MIST]

10 grams added to the head equals a 5 cpm variation in frequency i.e 1/2 half a flex.

+- 1/4 hosel depth= 2cpm

+- 2 grams head weight=1 cpm

Shows why one should swingweight/MOI first, before frequency matching. The use of a spreadsheet, where the head weight, shaft length, shaft weight, balance point, grip weight grip balance point etc.,, are inputed first and then head weight adjustments made, is very handy before any shaft is cut.

If you were Wishon profiling at 11, 16, 21 ...41 inches apart, would there always be the 5 cpm difference, with 10 g of head weight added?

[Chieflongtee]

If you were Wishon profiling at 11, 16, 21 ...41 inches apart, would there always be the 5 cpm difference, with 10 g of head weight added?

Most probably not as the readings get really high in the 11 inch section. I do not have the gear to measure at 11 inches but you do. Why don't you run a little winter experiment and post the results.
Merci Lyle.

[BC MIST]

Most probably not as the readings get really high in the 11 inch section. I do not have the gear to measure at 11 inches but you do. Why don't you run a little winter experiment and post the results.
Merci Lyle.

Oh, all right.

[tyorke1]

You mean 10 grams, softens flex by 1/2 of a flex. What does 10 grams do to tip flex? also if you back weight does this stiffen flex?
Also have you checked spin rates after adding weight? good post!!

[Chieflongtee]

10 grams in the tip or in the head will yield the same results imo. A tip weight will raise/shift the centre of gravity a bit I believe. Backweighing does not change flex as the added weight is under the hands.(and it won't yield a different cpm result in a frequency meter as the butt of the shaft is clamped) As far as spin rates I do not have the apparatus(contraption ) to check it. Best if you ask a fulltime clubmaker.

[BC MIST]

You mean 10 grams, softens flex by 1/2 of a flex. What does 10 grams do to tip flex? also if you back weight does this stiffen flex?
Also have you checked spin rates after adding weight? good post!!

Used a 454 g tip weight, measuring frequency at 41,36...11" and then I added 25 g and remeasured.

At 41,36,31 and 26, the differences were 5,4,6,6 cpms respectively. At 21, 10 cpm and at 16, 11 cpm's The 454 g weight was too light to get a consistent result at 11".

That you Tim. Still playing in the Can Am each year? Lyle

[danscustom]

Different shafts can and will yeild differnet results (or CPM's) as not every shaft is manufacured to a constant CPM rate of change per inch.

So a 10 gram increase will not always result in the 5 CPM shift.

If you cut the longest and shortest for your new build and freq them - you can determing the CPM rate of change for that shaft design.

This is why some manufactures say cut 1/4 inch per club, some 1/2 , some 5/8 etc.
It depends on the design or intent by the designing engineer

[tyorke1]

Really good post, great to here from an old friend, TIM

[Chieflongtee]

Different shafts can and will yeild differnet results (or CPM's) as not every shaft is manufacured to a constant CPM rate of change per inch.

So a 10 gram increase will not always result in the 5 CPM shift.

If you cut the longest and shortest for your new build and freq them - you can determing the CPM rate of change for that shaft design.

This is why some manufactures say cut 1/4 inch per club, some 1/2 , some 5/8 etc.
It depends on the design or intent by the designing engineer

There are always exception to the rule. I just tested 3 different shafts from 3 different suppliers and the change was 5 cpm per club.I posted this a a general guideline. Most shafts on the market are to be cut in 1/2 increments.10 grams of added weight mostly applies to drivers. And the cpm change no longer applies if the shaft is extended or shortened.

[danscustom]

And the cpm change no longer applies if the shaft is extended or shortened.

What do you mean by this?

[Chieflongtee]

What do you mean by this?

The 5cpm change will no longer apply if the shaft length is modified after the weight has been added.