Coefficient of Restitution

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Coefficient of Restitution

Post by MegaMav »

Paul & Co.

This topic came up last night in the chat, and would appreciate some clarity on COR.
Whats the real value of having a higher coefficient of restitution?

I understand, it is a higher level of energy transfer to the pins from the ball, but if the value of this property is merely having more coverstock and less core, why has the ball production industry gone away from it?

If you're going to throw more headpins, and kick more 6's off the plate what could there be to gain by pouring less coverstock, except money?

It seems the only company out there with no outer core filler is Legends and Lane Master.

Ball producers want to have the highest scoring equipment out there, why skimp out?

Thanks.
Last edited by MegaMav on January 18th, 2010, 5:10 am, edited 1 time in total.
Reason: Corrected for spelling - Thanks Jeff
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Re: Coefficient of Restitution

Post by scotts33 »

It seems the only company out there with no outer core filler is Legends and Lane Master.
Visionary Bowling Products is actually the only one that still does not use filler. LM/L uses filler in the Strike and Power series.
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Re: Coefficient of Restitution

Post by purduepaul »

MegaMav wrote:Paul & Co.

This topic came up last night in the chat, and would appreciate some clarity on COR.
Whats the real value of having a higher coefficient of restitution?

I understand, it is a higher level of energy transfer to the pins from the ball, but if the value of this property is merely having more coverstock and less core, why has the ball production industry gone away from it?

If you're going to throw more headpins, and kick more 6's off the plate what could there be to gain by pouring less coverstock, except money?

It seems the only company out there with no outer core filler is Legends and Lane Master.

There is a USBC specified range of between 0.650 and 0.750 in COR, the difference in filler materials is only really from around 0.700-0.7100 with normal three piece construction to 0.720-0.730 in two piece construction. It's not really a significant increase in energy transfer to the pins.

Basically the measurement of COR is that you transfer more energy to the pins meaning, that the head pin will come off of the ball with a slightly higher velocity than with a lower COR. You might throw one more pin off the kickback plate out of 20 let's say the difference would be negligible.


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Re: Coefficient of Restitution

Post by Graaille »

scotts33 wrote: Visionary Bowling Products is actually the only one that still does not use filler. LM/L uses filler in the Strike and Power series.
Actually, Visionary's Ogre line is the only one that's solid coverstock any more, New Breed and Gladiator both have filler.
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Re: Coefficient of Restitution

Post by Mo Pinel »

purduepaul wrote:
There is a USBC specified range of between 0.650 and 0.750 in COR, the difference in filler materials is only really from around 0.700-0.7100 with normal three piece construction to 0.720-0.730 in two piece construction. It's not really a significant increase in energy transfer to the pins.

Basically the measurement of COR is that you transfer more energy to the pins meaning, that the head pin will come off of the ball with a slightly higher velocity than with a lower COR. You might throw one more pin off the kickback plate out of 20 let's say the difference would be negligible.

Two different results occur from differences in COR. Higher COR means more pin velocity and more ball deflection. Lower COR means less pin velocity, but less ball deflection. Which one would you like. Six of one; half dozen of another!
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