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Author Topic: Drilling a P4 hole  (Read 3167 times)

lefty50

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Drilling a P4 hole
« on: June 10, 2013, 06:50:15 PM »
I know the answer to this question will probably sound obvious, but I have to ask it just to make sure.

Assume a mildly asym ball (.008) ball with ending static weights of 1/4 ounce thumb and 3/4 ounce side. In classic theory, removal of side weight would cause less overall hook on the lane. However, utilizing current core dynamic theory and considering placement of a P4 hole... according to how I read the Gradient Hole literature, P4 will take out both thumb and side weight, but will "potentially" hook more on the Lane due to the increased revs and differential of the resultant lower Rg and increased diff.

Yes?
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kidlost2000

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Re: Drilling a P4 hole
« Reply #1 on: June 10, 2013, 07:52:34 PM »
With a 1/4oz of thumb weight it will have to be a small in diameter hole or it will quickly go over the limit in legal finger weight.

Just from playing with the blueprint software and comparing the reaction difference of the same bowling ball, one with 1 oz positive side, no side weight and 1oz negative side weight the difference was nearly non-existent.

1oz positive side weight ball had a total hook of 28.81 boards
0 side weight had  a total hook of 28.49 boards,
and the negative 1 oz ball was in at 27.77 boards ot total hook

That is a 1 board difference total when going from 1oz positive to 1oz negative side weight. I would take the increase from the x-hole over the possible increase in side weight difference any day.

Just to graph the three balls listed above for a visual. Shot one is positive, two is neutral, three is negative.

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…… you can't  add a physics term to a bowling term and expect it to mean something.

Strapper_Squared

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Re: Drilling a P4 hole
« Reply #2 on: June 10, 2013, 08:39:31 PM »
Drilling the x-hole sufficiently deep to remove weight from the core, thus altering dynamics, has a significantly greater impact than static weights. 
Like stated above, those ending static before drilling, may limit the size of the hole, and thus the overall influence....though you probably could make the middle finger a little deeper to give more side/thumb.

S^2
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charlest

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Re: Drilling a P4 hole
« Reply #3 on: June 10, 2013, 09:20:15 PM »
With 1/4 oz. thumb weight and 3/4 oz of side, you can remove 1 1/4 oz. of thumb and still have 1 oz. of finger and be safe.
Removing 3/4 oz. of side or more and you can go so far as 1 oz. of negative side and still be safe.
That's a lot of core removal.

I put the MB/PSA in the thumb hole of a Solid Lev RG, with the CG more than 1" left of the pin-PSA line. I wound up with 5/8 oz of negative side weight and a bunch of finger weight. The PSA in the thumb hole increased dynamics so much, even with the pin OVER the middle finger (I'm a righty), the ball made a major freaking left turn.

Do not be afraid of using maximum negative side and thumb or finger weight. 3 oz. of top or bottom weight might make a tiny bit more difference, but the likelihood of that is miniscule.

The proper amount of core removal is of paramount importance, not final static weights.
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