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IT WORKS MATH IS YOUR FRIEND


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Posted (edited)
13 minutes ago, Valtiel said:


Posting a bunch of unclickable URLs as an embedded image is not exactly the most helpful 😜

put up or shut up.
true or false ?

T=(2*3.14)*((I/mgl)^(1/2))

(1/(2*3.14))*T=(1/(2*3.14))*(2*3.14)*((I/mgl)^(1/2))
(1/(2*3.14))*T=1*((I/mgl)^(1/2))
T/(2*3.14)=((I/mgl)^(1/2))
(T/(2*3.14))^2=((I/mgl)^(1/2))^2
(T/(2*3.14))^2=((I/mgl)^1
(T/(2*3.14))^2=I/mgl
(T/(2*3.14))^2*mgl=I/mgl*mgl
(T/(2*3.14))^2*mgl=I/1
(T/(2*3.14))^2*mgl=I

I=kgcm2

Edited by BREWMASTER95060
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Here’s my math...take the flat edge of the club, line it up to my target and hit it there. It also works hahaha

I think the most important part of the screen shot is the first line.

yes

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15 hours ago, Skipperation said:

It might help if you actually ask a question rather than just posting images of old posts which show equations? What is it that this thread is trying to achieve?

Putting stuff I found helpful in one spot.

I’m 62 I have to re-read stuff and To make sure I’m remembering right.To make sure I’m remembering right.

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I think your next search needs to be how to communicate on the internet or how to start a discussion on a forum.... this is close to Opinder style content and likely the same outcome for the OP. 

TM SIM 9* Aldila Rogue White 70TX 
TM M3 15* Aldila Tour Blue 95TX
TM P790 3, 2014 MC 4, 2014 MB 5-PW DG T.I. X100
TM MG 52, 56 Hi-Toe 60 DG T.I. Onyx S400
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2 hours ago, CKalma said:

I think your next search needs to be how to communicate on the internet or how to start a discussion on a forum.... this is close to Opinder style content and likely the same outcome for the OP. 

This is what I am talking about. 
look how simple this is:
 

bought these new off eBay 
 

i have 22-46 PTx

just by adding lead tape the 30-46 are swing weight matched and MOI matched

lead tape added to shafts @ 14”

30

34 + 5 grams

38 + 10 grams
42 + 15 grams
46 + 20 grams

XLVELLFBYV8E.jpeg

H4O91LAINYJ9.jpeg

OODI8J4RN1OG.jpeg

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How come I’m picturing Ben Crane if you’re actually golfing, with a checklist long enough to launch a satellite just to take the club back and 70 seconds standing over the ball. Enjoy your Hogans. 

SRIXON ZX5 9.5 MIYAZAKI MIZORE 60X.                                              SRIXON ZX 13.5 MIYAZAKI MIZORE 70X                                               SRIXON H85 16 MATRIX BLACKTIE 95 SRIXON Z FORGED 4-PW CATALYST 100 6.5                                   CLEVELAND RTX4 50* CATALYST 100 6.0                                        CLEVELAND RTX4 54* CATALYST 100 6.0                                         CLEVELAND RTX4 58* CATALYST 100 6.0.                                             SEEMORE mFGP20 PLATINUM 38” SNELL MTB-X

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Read over that this winter.  Will admit to being too lazy to come up with building the apparatus & a way to measure the arc accurately.  So I just went with:

 

Approximate equation for Moment of Inertia

Here's a similarly approximate equation for the moment of inertia of the club around an axis at the butt. MOI is the most physically sound measure of heft, the quantity that resists turning the club from cocked to released.

MOI = Lc2*(H + S/3) + 10*G

Where:

MOI = The moment of inertia of the club
Lc = nominal club Length (inches)
H = Head weight (grams)
S = trimmed Shaft weight (grams)
G = Grip weight (grams)

Again, we have some notes about the approximation:

  • The mass of the head is approximated to be a point mass at the length of the club. This is similar to what we did in the approximate formula for swingweight.
  • The shaft is approximated as constant mass per unit length. This is similar to what we did in the approximate formula for swingweight.
  • The grip can be ignored. It contributes less that 0.2% to the total moment of inertia, and normal model-to-model variations in grip weight will make a lot less difference  than that. So usually we are going to simplify matters and leave off the grip weight term.
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17 hours ago, BREWMASTER95060 said:

Looks good on paper but what I'd like to know is if it made a significant difference in ball striking/dispersion for you.

Thanks

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Posted (edited)
13 hours ago, Curious said:

Looks good on paper but what I'd like to know is if it made a significant difference in ball striking/dispersion for you.

Thanks

 

On 3/11/2021 at 10:44 PM, CKalma said:

I think your next search needs to be how to communicate on the internet or how to start a discussion on a forum.... this is close to Opinder style content and likely the same outcome for the OP. 

 

15 hours ago, mogc60 said:

How come I’m picturing Ben Crane if you’re actually golfing, with a checklist long enough to launch a satellite just to take the club back and 70 seconds standing over the ball. Enjoy your Hogans. 

 THANK YOU i DO ENJOY THEM gamers:

HOGAN APEX G LOOMIS SHAFTS
built  using weight flex sorted shafts I bought over 200 G Loomis shafts off eBay
weight sorting 
formulas 
MOI= HEAD GRAMS*LENGTH TO SWEET SPOT^2+ 1/3*SHAFT WEIGHT*BP^2+1/3*GRIP GRAMS*BP^2

MATCHING:
club2bp= (((club1bp^2*club1grams)/club2grams)^(1/2)

9B1CDEE1-A03F-489C-9972-9BE71D0DAB75.jpeg

9A1D3E79-BCF4-4621-ABAB-96D195A0CBDC.jpeg
360BA7AD-1395-42B0-8F95-01B161B23B65.jpeg
C87F05E3-A0C7-46A5-943A-80973BD18441.jpeg
3A0F474D-9554-4702-A525-516916024605.jpeg
7D756662-5053-4A47-AE0E-70F7B0275785.jpeg

Edited by BREWMASTER95060
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Posted (edited)
10 hours ago, Curious said:

Looks good on paper but what I'd like to know is if it made a significant difference in ball striking/dispersion for you.

Thanks

well that is the claim,  me not sure.
For me 8, 9 and wedges felt like swinging a brick on the end of a string.
So adding shaft weight sounds CRAZY BUT add weight just under the grip @14" feels great and makes MOI matching easy.
the heaviest club I have is a 512 gram sand wedge. 


 

Edited by BREWMASTER95060
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4 hours ago, GLF4EVR said:

Read over that this winter.  Will admit to being too lazy to come up with building the apparatus & a way to measure the arc accurately.  So I just went with:

 

Approximate equation for Moment of Inertia

Here's a similarly approximate equation for the moment of inertia of the club around an axis at the butt. MOI is the most physically sound measure of heft, the quantity that resists turning the club from cocked to released.

MOI = Lc2*(H + S/3) + 10*G

Where:

MOI = The moment of inertia of the club
Lc = nominal club Length (inches)
H = Head weight (grams)
S = trimmed Shaft weight (grams)
G = Grip weight (grams)

Again, we have some notes about the approximation:

  • The mass of the head is approximated to be a point mass at the length of the club. This is similar to what we did in the approximate formula for swingweight.
  • The shaft is approximated as constant mass per unit length. This is similar to what we did in the approximate formula for swingweight.
  • The grip can be ignored. It contributes less that 0.2% to the total moment of inertia, and normal model-to-model variations in grip weight will make a lot less difference  than that. So usually we are going to simplify matters and leave off the grip weight term.

"point mass at the length of the club. "
that is the sweet spot NOT club length.
5 Iron 38" length
5 iron Sweet spot 38+ depending on lie angle.

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7 hours ago, GLF4EVR said:

Read over that this winter.  Will admit to being too lazy to come up with building the apparatus & a way to measure the arc accurately.  So I just went with:

 

Approximate equation for Moment of Inertia

Here's a similarly approximate equation for the moment of inertia of the club around an axis at the butt. MOI is the most physically sound measure of heft, the quantity that resists turning the club from cocked to released.

MOI = Lc2*(H + S/3) + 10*G

Where:

MOI = The moment of inertia of the club
Lc = nominal club Length (inches)
H = Head weight (grams)
S = trimmed Shaft weight (grams)
G = Grip weight (grams)

Again, we have some notes about the approximation:

  • The mass of the head is approximated to be a point mass at the length of the club. This is similar to what we did in the approximate formula for swingweight.
  • The shaft is approximated as constant mass per unit length. This is similar to what we did in the approximate formula for swingweight.
  • The grip can be ignored. It contributes less that 0.2% to the total moment of inertia, and normal model-to-model variations in grip weight will make a lot less difference  than that. So usually we are going to simplify matters and leave off the grip weight term.

“point mass at the length of the club”

measure butt to club head sweet spot.

 

there is this it is close

http://golf.okrasa.eu/clubs/moi-en/moi-plan-en/

 

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