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Author Topic: Differential questions  (Read 1403 times)

Nicanor

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Differential questions
« on: August 06, 2007, 11:06:04 AM »
How is a bowling ball differential figured out and how does "differential" difference effect the bowling ball?  EG the difference between the No Mercy Beaten at 8.3 diffential and Tracks Kinetic at 6.0.  The back ends are similar in numbers as is the length according to BTM.




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Nicanor (Ten On The Deck)

Edited on 8/6/2007 7:07 PM

Edited on 8/6/2007 7:09 PM

Edited on 8/6/2007 7:09 PM
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Nicanor (Ten On The Deck)

 

J_Mac

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Re: Differential questions
« Reply #1 on: August 06, 2007, 08:21:30 PM »
I'm not entirely sure how BTM comes up with their numbers, but I'm pretty sure they're based on the real world numbers that every company publishes and the USBC verifies.

RG Max - RG min = Differential = possible flare amount

For example, the Fury is

2.515"-2.471"=0.044"

0.044 diff. might get you about 5" of track flare if you maximize the layout, but more differential, or flare, doesn't equal more hook.  Layouts that maximize the core strength on a high diff. ball can cause the ball to be very unstable.  The more unstable a ball, the earlier it will start reacting and stabilizing.

Hence the reason most balls designed for dry lanes are high RG and low diff.  Those numbers promote energy retention and late reads.

The numbers for length and backend will be the result of the core/cover combination.  The differential numbers solely based on the core, but without friction there will be a lot of length and no backend, irregardless of the cores design.


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"A word to the wise ain't necessary -- it's the stupid ones that need the advice."  Bill Cosby
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spinner031

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Re: Differential questions
« Reply #2 on: August 06, 2007, 09:04:00 PM »
I thought a higher differential meant a stronger backend, more skid/snap, more long and strong.
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J_Mac

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Re: Differential questions
« Reply #3 on: August 06, 2007, 09:26:28 PM »
quote:
I thought a higher differential meant a stronger backend, more skid/snap, more long and strong.


Not always...

If you look at the numbers that BTM published for the V2 Strong it has a 9.6 Diff. rating (in 15# the real world number is .069) and only a 13.5 backend rating.  The highest numbers you'll normally see are 16-16.5 out of 20.

That lower backend rating is mostly due to the medium load of particles, so you could say that coverstock strength or preparation has more to do with overall reaction than the core alone.

Perhaps a ball with a coverstock as strong, if not stronger, as the V2 Strong would be the World Class from Lanemasters.  BTM rates the diff. at 5.4 (real world 0.035, nearly half of the V2 Strong) and the 16.5 backend is pretty much the max you'd see in BTM reviews.

Half the potential flare, yet more backend.
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice."  Bill Cosby
"Never argue with an idiot. They bring you down to their level and beat you with experience."
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