CG PLACEMENT QUESTION

Which layout is right for me?

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Linknblue
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Positive Axis Point: 5 x 1/2 up
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CG PLACEMENT QUESTION

Post by Linknblue » November 22nd, 2021, 6:58 pm

I want to layout a ball that has the pin 1 to 1-1/4" from PAP. It's a symmetrical ball with a pin to cg of about 2 1/2". RG of 2.54 with .032 diff. Simply light bulb core. Where should the CG be placed now that you can't drill weight holes anymore? I had one a few years back and I remember the CG kinda stacked with a weight hole down by thumb hole.
John H. in Lincoln, CA
PAP =5 over and 1/2" up
Rev Rate = 275
Speed = 14 - 15 on monitor
Axis Rotation = 55 degrees
Axis tilt = 18 degrees
Average = 215 house & 200 sport
55 years of bowling = old guy trying to keep up

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MegaMav
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Re: CG PLACEMENT QUESTION

Post by MegaMav » November 23rd, 2021, 12:58 am

As long as the top weight is less than 3oz, anywhere on the gripping hemisphere of the ball.
“When you prepare for everything, you’re ready for anything.” - Bill Walsh

300Bowler
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Re: CG PLACEMENT QUESTION

Post by 300Bowler » November 23rd, 2021, 8:09 pm

CG on a symmetrical does not matter at all. When you were allowed weight holes you would leave some side weight so you could add a balance hole but with the new change you can place it pretty much anywhere and still be legal with side weight. Placement will have zero effect on the drilled balls performance.

duvallite
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Re: CG PLACEMENT QUESTION

Post by duvallite » November 24th, 2021, 5:32 am

^^^ This. It's really only surface and pin-to-pap distance in terms of tweaking the reaction of symmetric balls under today's rules.

Linknblue
Member
Member
Posts: 70
Joined: August 12th, 2014, 6:29 pm
THS Average: 215
Positive Axis Point: 5 x 1/2 up
Speed: 14 to 15 on score display
Rev Rate: 275
Axis Tilt: 18
Axis Rotation: 45
Preferred Company: Storm, Pyramid & Brunswick

Re: CG PLACEMENT QUESTION

Post by Linknblue » November 24th, 2021, 11:21 pm

So if I opt for a symmetrical ball, lay-outs are like 20 years ago. Pin distance from PAP is really the controlling factor (and surface)? Does pin up still mean "goes longer-hooks sharper" and pin down mean "rolls earlier and milder reaction"? CG location doesn't matter? Used to be CG toward center, CG stacked and CG swung out. Forget that cuz surface will fix whatever you want it to do (hook early or go longer)?
John H. in Lincoln, CA
PAP =5 over and 1/2" up
Rev Rate = 275
Speed = 14 - 15 on monitor
Axis Rotation = 55 degrees
Axis tilt = 18 degrees
Average = 215 house & 200 sport
55 years of bowling = old guy trying to keep up

User avatar
MegaMav
Moderator
Moderator
Posts: 4637
Joined: April 27th, 2007, 5:00 am
THS Average: 225
Sport Average: 200
Positive Axis Point: 4 15/16 Over 7/8 Up
Speed: 15.25 MPH - Camera
Rev Rate: 350
Axis Tilt: 14
Axis Rotation: 45
Heavy Oil Ball: Radical - Informer
Medium Oil Ball: Brunswick - Knock Out
Light Oil Ball: Radical - Bonus Pearl
Preferred Company: Radical Bowling Technologies
Location: Malta, NY

Re: CG PLACEMENT QUESTION

Post by MegaMav » November 24th, 2021, 11:28 pm

Pin Up: Faster Response to friction (taller core, higher diff)
Pin Down: Slower Response to friction (fatter core, lower diff)

Coverstock is the dominant factor in length, not core dynamics.
“When you prepare for everything, you’re ready for anything.” - Bill Walsh

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