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Author Topic: Figuring RG  (Read 1930 times)

kidlost2000

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Figuring RG
« on: August 06, 2009, 02:57:36 AM »
I need a little help remembering how to figure the RG for a bowling ball you are drilling or have drilled.

I use to have a great article saved from bowlingball.com newsletter but lost it.

Where you take the RG and add or minus the Diff depending on the pin distance from your PAP.


Thanks.
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Jay

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Re: Figuring RG
« Reply #1 on: August 07, 2009, 12:09:09 AM »
It's best for me to use an example than try to explain it.

Low RG = 2.50
Differential = 0.040

6.75/4  = 1.6875 = 1 11/16 (I believe you just move the decimal in the differential two places to the right)

For every 1 11/16" the pin is away from your PAP, add 0.01 to the low RG.  So if you do a 5" pin to PAP, the drilled RG will be about 2.53(5/1.6875 = ~2.96).
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Warmon

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Re: Figuring RG
« Reply #2 on: August 14, 2009, 09:47:08 PM »
How do you figure asymmetrical Mass Bias differential? Is it figured the same way [6.75/x]? For example the mass bias differential on the Twisted Fury is 0.023
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Jay

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Re: Figuring RG
« Reply #3 on: August 15, 2009, 01:34:43 AM »
The MB differential is sn't  something you can figure out with a formula as far as I know.  The company figures that out when the core is designed.  They usually say what it is on their site and probably in the drill sheet as well.
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kidlost2000

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Re: Figuring RG
« Reply #4 on: August 15, 2009, 06:05:01 AM »
Yeah I contacted tech support from ebonite and they advised you cant figure RG on symmetric or asymmetric balls without a program and some other tools.

Which is weird because a few years ago bowlingball.com posted an article in there news letter that had it for figuring the RG on symmetric balls that was pretty easy. Very similar to what is listed about, but slightly different.
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" hand, don't step on the lanes without some "
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…… you can't  add a physics term to a bowling term and expect it to mean something.

Warmon

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Re: Figuring RG
« Reply #5 on: August 15, 2009, 02:07:00 PM »
It's odd that Ebonite is telling you this, when it's posted on right on thier own site: http://ebonite.com/resources/bowling_tip_detail/pin_positions_and_dynamic_reactions

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kidlost2000

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Re: Figuring RG
« Reply #6 on: August 15, 2009, 03:24:56 PM »
Thanks for the post, that was the article used in the Bowlingball.com news letter years ago.

Ronald Hickland of Ebonite stated in email

The Rg we publish is the low Rg (pin).
If you take the low Rg value and add the diff. we publish you will have the high Rg value.
If you take the high Rg value and subtract the mass bias value you will have the med rg value.

So you can determine all three Rg values from the given information.
Amazingly I have not seen a published coorelation between Rg values and performance. That is something I am working on.

You are better using the listed Rg and not worrying about the small differences at this point.  You would need tools that just aren't available yet to begin to put together useful information about Rg.
 

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" hand, don't step on the lanes without some "

Edited on 8/15/2009 3:27 PM
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…… you can't  add a physics term to a bowling term and expect it to mean something.
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