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Author Topic: low rg and high diff question...  (Read 57904 times)

lefty50

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low rg and high diff question...
« on: July 07, 2015, 06:38:18 PM »
current specs.. Left hand, 250 rev, 16.5 off the hand, high axis rotation.

the following is primarily, but not totally, a med-hvy oil and up scenario question.

Several years ago I was told by members on this forum whom I trust that with my style of bowling (low rev, high rotation), I would always want a low RG high differential ball. That did and still does make sense to me since my favorite ball at the time was a storm Special Agent. I've always done well with high diff symmetrical balls, which makes sense. Any ball with a high RG lopes down the lane too long and never gets into a roll. Low differential ball are pretty much the same.

It seems to me that these days the vast majority of balls are higher RG and lower differential, but yet they are advertised as big hook balls, which flies in the face of what my style encounters in real life. The answer is either that they are no longer making the type of ball I prefer (few exceptions) or that the cover stock is so dramatically different that I no longer have the low RG high differential qualification requirement.

I should add that I have had nothing but trouble with asymmetric and will only buy symmetric from now on. I know that there are few balls out there like the Motiv Covert Revolt, but there are many others I would like to try based on their rating to give me some help in the rev department, but I just can't see a .047 or so low rg ball revving enough for me.

Which is true?
Thanks in advance

 

tommygn

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Re: low rg and high diff question...
« Reply #31 on: July 15, 2015, 07:48:21 AM »
Sorry I can dispute your case as easily as you can defend it
Unless it the exact same bowling ball with a core differing by .03 in RG too many variables
And trust me I understand MOI as well as coefficient of restitution which is an effect also
If you feel 3/100,000 of inch matters great...I don't

I'm not disputing what is the primary factor in ball motion(cover stock material and it's preparation). I'm disputing the relevance of Rg as it pertains to being a factor of any kind, which is the way I took your response to the original post. Let me ask you, at what point does a ring 10 or ring 7 pin become a strike? Is it the difference of 1/32" (0.032), or 1/16" (0.062) at contact of the pins? How much force does the 6 or 4 pin have to exert on the 10 or 7 pin respectively to make that pin fall? What is the degree difference of Tommy Jones being able to roll the 2 pin in a 2-10, when many other players seem to leave it, a few thousands of an inch?

When a customer walks into my shop, clearly we need to get the right cover stock and cover preparation for their game in their hands based on the conditions and type of oil they are bowling on. But along with that, is picking an appropriate core as well, and for certain bowlers, the Rg can be just as important of a factor in carrying the 10 or 7 pin, or not leaving a 2-10 or 3-7, and leaving a make-able spare, as differential is, once you have the cover and cover prep narrowed down, on a missed shot.
And I agree with you, there are far too many possible variables when it comes to bowling. Especial how different bowlers will throw a ball, to delve into the realm of absolutes, like Rg doesn't matter. That's just my opinion.
« Last Edit: July 15, 2015, 07:53:12 AM by tommygn »
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BradleyInIrving

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Re: low rg and high diff question...
« Reply #32 on: July 15, 2015, 02:47:13 PM »
New cult has been born.. Rgnomaddah now.. That's a good one :)

Good Times Good Times

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Re: low rg and high diff question...
« Reply #33 on: July 15, 2015, 03:38:29 PM »
covermaddah
GTx2

Brickguy221

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Re: low rg and high diff question...
« Reply #34 on: July 15, 2015, 03:55:27 PM »
covermaddah

 ......... indeeditdoesalotmorethanpeoplethink  ^^^^^^^^^^^   ;)
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JustRico

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Re: low rg and high diff question...
« Reply #35 on: July 15, 2015, 04:07:36 PM »
So your true belief is that 3/1,000 of an inch effects the motion & moment of inertia in an object of 8.5" in diameter?
You case study is flawed plus it is a limited instance
You cannot base any fact unless it is a controlled test...
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JustRico

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Re: low rg and high diff question...
« Reply #36 on: July 15, 2015, 04:09:51 PM »
You are comparing similarities not absolutes
It's flawed
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tommygn

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Re: low rg and high diff question...
« Reply #37 on: July 15, 2015, 04:18:37 PM »
You are comparing similarities not absolutes
It's flawed

Please answer the question, how do you change Rg of an exact core, without creating another different variable?  Density= variable,  shape= variable, layout=variable, total ball weight= variable.
God creates us with a blank canvas, and the "picture" we paint is up to us. Paint a picture you like and love!

JustRico

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Re: low rg and high diff question...
« Reply #38 on: July 15, 2015, 04:25:39 PM »
Generally it's density
So you've increased overalls as 3/1,000"'
You seemed quite fixated on such an insignificant number
Unless you take two IDENTICAL masses - one being 3/1,000" higher RG and NOTHING else, laid out and thrown side by side can you stare anywhere close to what you are attempting to state
You CANNOT base off an individual visual perception such as look how it goes through the pins
That's coefficient of restitution which deals more with surface that anything else
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tommygn

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Re: low rg and high diff question...
« Reply #39 on: July 15, 2015, 04:28:48 PM »
Density is a changed variable, thus not the exact same. Still waiting.
God creates us with a blank canvas, and the "picture" we paint is up to us. Paint a picture you like and love!

JustRico

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Re: low rg and high diff question...
« Reply #40 on: July 15, 2015, 04:38:02 PM »
Still waiting for what? Your so called test is flawed...
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BradleyInIrving

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Re: low rg and high diff question...
« Reply #41 on: July 15, 2015, 05:00:01 PM »
https://www.youtube.com/watch?v=9e9ysnJA9qA

Rg does matter... You may want a physics lesson :)

JustRico

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Re: low rg and high diff question...
« Reply #42 on: July 15, 2015, 05:32:14 PM »
I'm quite well versed in physics thank you
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Track_Fanatic

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Re: low rg and high diff question...
« Reply #43 on: July 15, 2015, 06:43:27 PM »
I'm quite well versed in physics thank you

No way!  Who would have thought?  I thought you were just a poser in the bowling industry for the past 30 + years.   

JustRico

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Re: low rg and high diff question...
« Reply #44 on: July 15, 2015, 06:48:35 PM »
Many on here would lead you to think that huh...
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BradleyInIrving

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Re: low rg and high diff question...
« Reply #45 on: July 15, 2015, 06:53:15 PM »
Ric, I wasn't referring to you ! lol, you and I are on the same side!