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Author Topic: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?  (Read 9172 times)

bgh

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USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« on: July 31, 2007, 08:44:37 AM »
Article : USBC Equipment Specifications and Certification - Center of Gravity placement on a symmetrical bowling ball: How critical is it? - By Paul Ridenour, USBC research engineer

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Edited on 8/6/2007 6:43 PM
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JessN16

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #1 on: July 31, 2007, 04:54:22 PM »
So if I understand it, the verdict is, "CG matters, not as much as some believe, but more than others believe?"

Sounds like it's right down the middle of the two arguments, which is where the truth usually is.

Jess
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kmanestor22

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #2 on: July 31, 2007, 04:59:52 PM »
quote:
Article : USBC Equipment Specifications and Certification - Center of Gravity placement on a symmetrical bowling ball: How critical is it? - By Paul Ridenour, USBC research engineer

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Edited on 7/31/2007 4:55 PM
fixed
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kmanestor22

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #3 on: July 31, 2007, 05:03:59 PM »
"Ball A is the positive center of gravity ball, ball B is the negative center of gravity ball. It is worth noting that although the two graphs line up at the beginning with each other, the negative center of gravity ball takes four feet longer to start its hook phase compared to the positive center of gravity ball."

Four feet longer...sounds like irrefutable proof that cg matters!!!!!
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Steven

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #4 on: July 31, 2007, 05:07:29 PM »
Good to see the USBC results out. I found the following passages of particular interest:

quote:
It is worth noting that even though these are minor differences, they are still differences. Mathematically, the difference in position is roughly only about 10 percent; this is not always easy to tell on the lanes observing from 60 feet away. USBC had thought the balls looked very similar in reaction; however, the math paints a different picture.  


AND............

quote:
In closing, both sides of the center of gravity debate should be able to appreciate this study, since it does show a difference between positive weight and side weight; however, that difference only amounts to about a 10 percent difference overall in change of position on the lanes.
 


Going back to the Brunswick video, you saw the difference that 10% made when the lanes started to settle in -- The Positive went through the nose while the Negative still struck.  

10% can be a significant difference to a skilled bowler. I don't know if it's enough to legally require a Brunsnick recall of CGNOMADDAH t-shirts, but at least there is clarity from a neutral third party.
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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #5 on: July 31, 2007, 05:10:37 PM »


P-L-E-A-S-E!!  Kill me now...


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bgh

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #6 on: July 31, 2007, 05:12:20 PM »
quote:


P-L-E-A-S-E!!  Kill me now...


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Edited on 7/31/2007 5:18 PM
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kmanestor22

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #7 on: July 31, 2007, 05:14:48 PM »
quote:


P-L-E-A-S-E!!  Kill me now...


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purduepaul

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #8 on: July 31, 2007, 05:25:04 PM »
Just to clarify something, its not four feet in breakpoint, its 4 feet before the first transition.  The breakpoint difference is a little over one foot.
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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #9 on: July 31, 2007, 05:27:49 PM »

Quote:
Do worry.  You'll all drink the Kool-Aid together at Nick's party tonight.  Zoltan!!! indeed
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Just kidding!!  I like Nick. Isn't he the fat guy in the red suit who brings presents?




 

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bgh

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #10 on: July 31, 2007, 05:30:36 PM »
quote:
Just to clarify something, its not four feet in breakpoint, its 4 feet before the first transition.  The breakpoint difference is a little over one foot.


Thanks, Paul - Great job on your article, good read. Is this going to be posted on Bowl.com anytime soon! Seems like Herbert Bickel (BowlingDigital.com) seems to get an advance exclusive on most of these USBC Testing and Specification articles. Only can find a few of these on Bowl.com - unless they are buried in the layers of menus on the USBC site.
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Edited on 7/31/2007 5:50 PM
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purduepaul

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #11 on: July 31, 2007, 05:37:22 PM »
The article will be posted on bowl.com sometime this week, probably tommorrow.
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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #12 on: July 31, 2007, 05:41:51 PM »
Thank you KeglerX and Paul for the info.



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notclay

Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah

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Juggernaut

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #13 on: July 31, 2007, 06:14:12 PM »
quote:
the only substantial difference is that the positive CG ball has positive side weight of 1.25 ounces and the negative CG ball has negative side weight of 1.35 ounces.



  I thought the maximum allowable "legal" sideweight was 1 oz.  Therefore, the maximum allowable difference for this test should be 2 oz, but they themselves ( U.S.B.C. ) used balls that were, in essence "illegal", so the test results are still null and void.

1.25oz+1.35oz=2.60oz--- Out of tolerance by .60

  If you are going to do the test, you should at least stick to the legal ruling you have made yourself.  Swinging the CG out to 45 degrees should not be done if it put the ball outside of the "legal" limits.  If it is outside those limits, the appropriate weight hole should have been used to bring it back within specs.

  If you are going to arbitrarily test balls without regards for the "legal" limits, what good does that data do us in the "real world" environment? You would never be allowed to swing the CG that far, ending up with too much sideweight, and still be allowed to use it in sanctioned competition until the weighthole was applied to bring it back to "legal" specs.

  How could they overlook something like that?
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Edited on 7/31/2007 6:15 PM
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Gunny

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Re: USBC Equip & Spec : Center of Gravity placement on a symmetrical bowling ball: How critical is it?
« Reply #14 on: July 31, 2007, 07:46:17 PM »
so brunswick testing showed that cg dont matter, and this testing shows that it does....round and round we go.  i agree with what juggernaut said, get 2 identical balls and drill them within the the rules.  use a basic drill pattern, stay within the rules and do the test.  lets not inflate numbers to get minimal effects.  lets stay within the realm of reality on the lanes and within the rule guidelines.
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