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Author Topic: High RG core and early pin positions?  (Read 2978 times)

2handedrook12

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High RG core and early pin positions?
« on: February 29, 2016, 02:49:42 PM »
Any layout technicians that can describe how this would react? To give purpose to the question, I'm considering an AMF Pure Adrenaline Adrenaline with the intent to get the core to read earlier (around 3 inches from PAP) instead of setting it up to read later with a pin position around 5 inches from PAP. I'm curious if this would allow the ball to read similar to a low RG ball and mininize the snap reaction while still clearing the heads well. My Ride with a pin closer to the axis (2 inches) and surface (1000 or 2000) inspired this idea.
League: Pitch Purple, Destiny Magenta
Testing: MVP
Interests: Black Widow, Proof Solid, Idol Pearl

 

tgknukem

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Re: High RG core and early pin positions?
« Reply #1 on: March 01, 2016, 11:02:35 AM »
BR's specs on the pure adrenaline give it an average RG of 2.55.  The ball would be at this average RG undrilled at 3 3/8 th" from the PAP.  With the pin at 3 inches from the PAP the RG would be about 2.546.  This will give you the rev rate, (lane read potential I guess) of what this medium RG ball was designed for with a leveraged pin position.  A low RG ball of say 2.48 would give you probably 5-10 more RPM with a leveraged pin and a bit earlier read. (math done with a 'average' rev rate of 300 RPM)

BradleyInIrving

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Re: High RG core and early pin positions?
« Reply #2 on: March 01, 2016, 12:59:10 PM »
Take into effect that the diff is .055...   With that it's going to read early anyway..

cheech

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Re: High RG core and early pin positions?
« Reply #3 on: March 01, 2016, 05:12:31 PM »
while the shorter pin position will help the hook phase be earlier, it will not elongate the hook phase. you can adjust the length of the hook phase by lowering the pin position or increasing the VAL angle to lengthen the hook phase

2handedrook12

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Re: High RG core and early pin positions?
« Reply #4 on: March 01, 2016, 05:56:17 PM »
while the shorter pin position will help the hook phase be earlier, it will not elongate the hook phase. you can adjust the length of the hook phase by lowering the pin position or increasing the VAL angle to lengthen the hook phase
Can I do both or is that a bad idea?
League: Pitch Purple, Destiny Magenta
Testing: MVP
Interests: Black Widow, Proof Solid, Idol Pearl

JustRico

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Re: High RG core and early pin positions?
« Reply #5 on: March 01, 2016, 06:10:27 PM »
Rev rate will dictate pin to pap coordinates and diff effects hook phase...surface dictates length before core has any effect
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iamone78

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Re: High RG core and early pin positions?
« Reply #6 on: March 01, 2016, 07:28:56 PM »
The ball is pretty smooth and not so angular. I've seen guys with a ton of hand and revs and the Pure Adrenaline doesn't disappoint with jumping off the dry. It's very similar to the Pure, but with a touch more length and very similar ball shape. I'm not an expert, but I thought on symmetricals, there was more flare with pin to paps at 3-4" and above 4" the flare decreases, where as asymmetricals, flare increases above 4" and decreases above ~5 to 5.25"? I wouldn't be afraid to put a favorite layout or a stronger drill angle on that ball. In my experience with that combustion core, I've liked it better with a lower drill angle and a little surface (1500 or 2K) to get it to read a bit earlier. I've never had a ball with this core jump off the spot. They were more of a strong arch ball shape if I had to describe it. Just my 2 cents, I hope you like the ball, good luck!
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tgknukem

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Re: High RG core and early pin positions?
« Reply #7 on: March 02, 2016, 11:15:33 AM »
Take into effect that the diff is .055...   With that it's going to read early anyway..

If you mean earlier read due to higher friction response due to higher axis migration potential than that's possible.  If you mean due to increased rev rate, RG differential has no effect on rev rate.  I'm sure you mean the potentially greater friction response.

BradleyInIrving

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Re: High RG core and early pin positions?
« Reply #8 on: March 02, 2016, 04:54:54 PM »
Tg, yes ;)

If I meant due to increased rev rate I'd have said so :)