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Why does urethane spin more?


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What are the physical differences that make a urethane covered ball spin more than an ionomer covered ball? Friction?  Softness?  Coefficient of restitution?

14 of the following:

Ping G400 Max

Cobra King F9 Speedback 3 wood

Callaway Big Bertha Heavenwood

Cobra F9 Speedback 7/8 wood set at 23.5 degrees

Taylormade M4 5 hybrid

Callaway Mavrik Max 6-GW

PXG 0211 5-GW

PXG 0211 sand wedge bent to 53 degrees

Maltby M Series+ 54 degree

Ping Glide 3.0 Eye2 58 degree

Ping Sigma 2 Anser

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I believe technically it classifies as "magic".

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My understanding is that the urethane cover is softer, and this allows for more friction on the clubface, i.e. more spin.

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:bridgestone-small: Tour B X

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2 minutes ago, adamflowers said:

My understanding is that the urethane cover is softer, and this allows for more friction on the clubface, i.e. more spin.

Yep.

Quote

Urethane covers are softer than surlyn, thus allowing the cover of the golf ball to dig more into the grooves of a wedge.

 

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8 hours ago, adamflowers said:

My understanding is that the urethane cover is softer, and this allows for more friction on the clubface, i.e. more spin.

If I understand correctly, the softer urethane cover by itself adds some spin, but it's more due to the softer cover being on top of a firmer ionomer mantle that really adds the spin. This is why you don't see a 2-piece urethane ball, because it wouldn't have the same ability to "grip" against the core. And why basically all ionomer balls are 2-piece, because the mantle would need to be firmer than the cover.

...I think 😬

 

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4-wood: :callaway-small: Mavrik Subzero (16.5*) with Aldila Rogue White 130 MSI X
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52*, 58* :cleveland-small: RTX ZipCore Modus3 Tour 115
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yep, I believe that soft-hard combination is correct.

:mizuno-small: ST 200 9.5°, Mitsubishi Tensei AV Blue 65 S

:mizuno-small: ST 200 3w 15°, Diamana S+ 60 S

:srixon-small: Z H85 3h 19°, Project X Hzrdus Black Hybrid 6.0

:taylormade-small: P770 (2017) 4-PW, KBS Tour FLT 120 S

:vokey-small: SM8 50.08F, 54.14F, 58.08M, KBS Tour S

:ping-small: Sigma 2 Fetch 34"

:bridgestone-small: Tour B X

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Its my understanding that its because its softer, so it has more friction and spins more as it rides up the clubface at impact.  It works much the same as how soft tires do on a racecar.  That also explains why surlyn balls tend to be more durable: harder cover.

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On 8/9/2020 at 7:02 AM, Middler said:

Yep.

 

 

It's friction, but it's not the grooves.  Early tests with grooveless clubfaces produced more spin on clean contact.

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Thanks for the responses.

14 of the following:

Ping G400 Max

Cobra King F9 Speedback 3 wood

Callaway Big Bertha Heavenwood

Cobra F9 Speedback 7/8 wood set at 23.5 degrees

Taylormade M4 5 hybrid

Callaway Mavrik Max 6-GW

PXG 0211 5-GW

PXG 0211 sand wedge bent to 53 degrees

Maltby M Series+ 54 degree

Ping Glide 3.0 Eye2 58 degree

Ping Sigma 2 Anser

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On 8/9/2020 at 4:19 PM, greggarner said:

If I understand correctly, the softer urethane cover by itself adds some spin, but it's more due to the softer cover being on top of a firmer ionomer mantle that really adds the spin. This is why you don't see a 2-piece urethane ball, because it wouldn't have the same ability to "grip" against the core. And why basically all ionomer balls are 2-piece, because the mantle would need to be firmer than the cover.

...I think 😬

 

This guy knows what he's talking about.

There is a myth that softer compression urethane balls spin more then firmer compression urethane balls and that is absolutely not the truth.

It all depends on the layer differentials (ie the softer cover working against the firmer layer underneath it)

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