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Author Topic: backend not good  (Read 1773 times)

no300yet

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backend not good
« on: September 08, 2007, 04:50:40 PM »
I( right hander)have a new Hammer Blue Vibe( light oil ball) that is drill to go long: pin 5 in. from PAP. CG is way out to the right, which seems kind of odd to me.

--------o  pin
-------O O
------------x  CG


--------O

It clears the head pretty good and starts to hook at about the right time. But that small hook "dies"( not a continuous hook). It's more like a 15 deg. change in direction and becomes straight. Cosequently my "carry" suffers. Hitting power is still good. I have no such problem with my other balls but then again, this is the only ball drilled to go long.

I wonder if a "balance hole" 5 in. to the right of the center of my span( according to Hammer drilling inst.) will help the situation. OR is there a "mass bias" problem?

Thanks for your advice!

Vincent

Edited on 9/9/2007 1:10 AM

Edited on 9/9/2007 1:10 AM

 

dizzyfugu

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Re: backend not good
« Reply #1 on: September 11, 2007, 06:34:22 AM »
Deadbait is IMHO correct, even though that not knwoing your PAP makes things difficult. I assume you are a high tracker?

With 5" from PAP, the ball has a tamed-down recation, and the CG swung out towards the PAP (assuming CG matters...) makes it roll earlier - the core comes easily into its final position, the PSA, and the ball apparently "hooks out" and goes straight in the back end. IMHO a stacked CG directly below the pin would have given you more drive in the back end, this way the ball is very tame but is a excellent to battle flying back ends (what it apparently does well  ).

There is no MB problem, since the Blue Vibe has no noticable mass bias, and even if it had the MB position would also promote the smooth but earlier roll that is only delayed by the high pin position.

What to do? You could try a balance hole under your PAP, in hope to increase and prolong the hooking action a little. Drilled deep enough (try a smaller but deeper hole, not a broad & shallow one) it might touch the core and shift the CG effectively back towards your grip center, also improving on the hooking action.
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Nails

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Re: backend not good
« Reply #2 on: September 11, 2007, 07:05:39 AM »
If your diagram is accurate, I'd have the ball weighed for statics.  You might be illegal on positive or possibly finger weight.  Even though statics mean little anymore, I've seen balls roll better after drilling a weight hole  Whether it's from removing the excess weight or from the change to the dynamics from the hole is irrelevant.
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no300yet

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Re: backend not good
« Reply #3 on: September 12, 2007, 11:52:21 PM »
Thanks for the reply, very helpful! I am still not 100% sure about the CG. It's just the "original" mark on the ball. I thought I read that it does not matter in a symetrical ball like mine.

I have decided it's a combination of weak drilling( does not fit my style) and dry lanes. I'll have a weight hole drilled and change my release angle to add more side/axis rotations. Kind of like if this ball is drilled for a mid tracker, I can become one too! Hope it'll work. We'll see.

Thanks again!

no300yet

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Re: backend not good
« Reply #4 on: September 16, 2007, 12:19:09 AM »
As planned, added weight/balance hole to increase flare and changed hand angle at release( about 10 o'clock). I gained about 6 boards and "most" of it at the backend, which looks excellent with "great" carry: never a standing 5 pin in the last 7 games!

Not only am I 100% satisfied but it's even better than I expected when I bought this ball.

Thanks again!

Vincent