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The title of this article '''authored by Jim Merrell''' paraphrases a comment heard by a forum member while viewing a PBA telecast.<br />
 
Source: http://forum.bowlingchat.net/viewtopic.php?f=3&t=8158  post #10
 
  
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'''From A reply by Jim Merrell to the topic Carrydown or Depletion? What to look for'''
  
What follows are the Musings of Jim Merrell, offered to clarify and explain just what working the inside vs. working the outside of the ball means. If you like this article, remember to visit Jim's original post and click the green plus sign.
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Source: http://forum.bowlingchat.net/viewtopic.php?f=20&t=13148
  
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As to what to look for? It's a little more complicated than a one line answer, sorry for the long post.
  
Wouldn’t it be great if the PBA Tour went back to presenting a “Tip of the Week”, that added value to the game.
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Disclaimer: none of the following is based on scientific data......just my observations over many years.
  
Saying the Pro’s play the inside of the ball and the amateurs play the outside of the ball is opportunistic moment to educate the bowling public. But what does the mean without a visual reference? The comment probably flew over the heads of most viewers, and others like you are left guessing. With all the technology available today, a thirty second infomercial would go a long way towards growing our sport.  
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I view depletion as a reduction of something; that something being oil in the case of the bowling environment.
  
The following is my interpretation of the announcer’s comment.
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'''Here's the simple explanation:'''
Read at your own risk.<br />
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Depletion of oil on the lane results in earlier reaction (ball could lose energy too soon....lose of down lane reaction).
  
This article is not to suggest that this is the only way to bowl, just an explanation of how to make the inside out release happen if you choose to give it a try.<br />
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Carry down of oil on the lane typically results in later ball reaction.
  
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Now for the dissertation:
  
'''<big>Inside to Outside reference points</big>'''<br />
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'''Depletion of oil'''
  
[[File:20130614 file1.jpg]]
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'''Givens:'''
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1) The ball is traveling at its fastest speed as it leaves the hand (facilitates skid).
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2) Axis Rotation is at its greatest at release (facilitates skid).
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3) During the balls path down the lane track flare increases exposing fresh cover stock (facilitates depletion of oil).
  
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'''Axiom #1'''
  
To understand what this means we must have a reference point.
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Oil depletion occurs at a greater rate in the mid lane versus the head area in my humble opinion.
In my first attachment, I have drawn a vertical line through the center of the ball as my Reference Line. Additionally, I have shown representation of the hand being Inside, Behind and Outside the Reference Line.
 
  
As the swing and ball enter the release area (this is defined as the ball position being just slightly behind the calf of the slide leg) while the hand is still positioned on the '''<u>Inside</u>''' of the Reference Line.
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'''Reason being:'''
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1) Ball speed and axis rotation are at their greatest during the first part of the lane.
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2) Ball speed and axis rotation decrease in the mid lane as flare increases.
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3) Track flare is a contributing factor to mid lane oil depletion.
  
As the swing and ball near the bottom of the swing the hand moves to a position approximately '''<u>Behind</u>''' the Reference Line.
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'''Axiom #2'''
  
As the swing nears the front of the foot the hand has rotated to a position on the '''<u>Outside</u>''' of the Reference Line.
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I had a great reaction then the heads starting hooking. Really?
  
So in a distance of approximately 14-16 inches the hand rotates from a position '''Inside''' of the Reference Line to a position '''Outside''' of the Reference Line.
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'''Maybe not:'''
  
This is what the announcer was referring to when he stated the Pro’s played the inside of the ball.
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Depletion of oil in the mid lane moves shortens the skid zone and moves Hook Zone closer to the foul line.
See the Pro release examples below for further reference.
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What once was a good reaction we now see the ball over reacting down lane. (slide #2)
  
Note: the examples shown all have maintained some degree of wrist cock as they enter the release area. Their high rev rates are a resultant of rapidly uncocking and rotating the hand from Inside to Outside the Reference Line in a short time frame.
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The move left (right handers) is not to find more head oil, but to get the ball into the fresh oil in the mid lane restoring our original ball reaction. (slide #3)
  
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'''Carry down'''
  
'''<big>Pro Example 1</big>'''<br />
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Oil picked up on the balls surface in the mid lane is re-deposited on the lane after the ball leaves the end of the oil pattern. (slide # 6)
  
[[File:20130614 file2.jpg]]
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The additional oil past the end of the pattern reduces the traction between the ball and the lane surface. Less traction….less reaction.
  
'''<big>Pro Example 2</big>'''<br />
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'''Oil depletion and carry down similarities.'''
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Excessive oil depletion in the mid lane can cause the ball to progress through the Skid and Hook Stage
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prematurely. Turning rotational energy into translational energy too soon and the ball often hits flat.
  
[[File:20130614 file3.jpg]]
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Carry down moves the Hook Zone further down lane, reducing the balls chances of getting into the Roll Stage. Often resulting in the ball hitting flat.
  
'''<big>Pro Example 3</big>'''<br />
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'''Thus, similar effects on ball motion down lane.'''
  
[[File:20130614 file4.jpg]]
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'''General guidelines:'''
  
'''<big>Pro Example 4</big>'''<br />
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Move feet and maybe target left ………ball reaction restored………probably dealing with oil depletion.
  
[[File:20130614 file5.jpg]]<br />
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Move feet and maybe target left ………ball reaction not restored………change to a weaker ball and deliver another ball on the same line. Ball reaction restored……...oil depletion.
  
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Ball reaction not restored………. possibly carry down.
  
<big>'''Let’s now take a look at the physical game technique leading up to the ability to play the inside.'''
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Carry down………move feet and target right of the original target to get around carry down. Sometimes, this move will require balling up to a stronger cover stock.
  
</big>
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While this may seem like a lot to digest......once familiar with the process.....it only takes several shots for me to make a decision what the athlete is dealing with....depletion or carry down.
  
As you can see in RR1 (below), by the time Ronnie’s back swing has reached the bottom of the back swing he has incorporated quite a bit of wrist cock (which is defined by the blue lines). <br />
 
Incorporating wrist cock makes it much easier to keep the hand on the inside of the ball all the way up to the top of his swing in RR4.<br />
 
  
Ronnie’s '''gravity controlled downswing''' from RR4 to RR7 allows him to maintain the wrist cock set going back in RR1 well into the down swing as seen in RR7.
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Put Slides after this
  
Once in this position, it’s time to work the inside to outside release as explained previously.
 
  
[[File:Jim_Merrell_-_Ronnie_Russell.jpg]]<br />
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[[File:1 Fresh Shot Good Ball Reaction.jpg]]
 
 
 
 
 
 
 
 
 
 
 
 
<big>'''Playing the Outside of the Ball'''.</big>
 
 
 
Again I will utilize the red Reference Line, but have added a green line at the ball’s equator.
 
 
 
Let’s look at two examples of playing the Outside of the ball.
 
 
 
 
 
 
 
<big>'''Amateur A'''</big>
 
 
 
 
 
[[File:20130614 file6.jpg]]
 
 
 
As the swing and ball enter the release area the hand is already on the Outside of our Reference Line. Additionally the fingers are positioned quite a ways above the ball’s Equator Line (green reference line).
 
 
 
As the swing and ball near the bottom of the swing in Slide 2 you can see the broken position of the wrist as indicated by the blue lines. Fingers above the Equator Line & broken wrist position - two power leaks.
 
 
 
As the swing nears the front of the foot the fingers are positioned very near the top of the ball. This is more than likely a high tilt / low rev rate type release.
 
 
 
 
 
'''<big>Amateur B</big>'''<br />
 
 
 
[[File:20130614 file7.jpg]]<br />
 
 
 
As the swing and ball enter the release area the hand is already on the Outside of our Reference Line. However the fingers are still positioned very near the ball’s Equator Line and his wrist is in a slightly cupped position.
 
 
 
As the swing and ball near the bottom of the swing in Slide 2, you can see that the wrist and forearm are in a very straight line with the fingers positioned right on the Equator Line.
 
 
 
As the swing nears the front of the foot the fingers are still close to the Equator Line. Amateur B’s rev rate is probably in the 300-350 range.
 
 
 
Hope this helps.<br />
 

Revision as of 07:30, 2 July 2017

From A reply by Jim Merrell to the topic Carrydown or Depletion? What to look for

Source: http://forum.bowlingchat.net/viewtopic.php?f=20&t=13148

As to what to look for? It's a little more complicated than a one line answer, sorry for the long post.

Disclaimer: none of the following is based on scientific data......just my observations over many years.

I view depletion as a reduction of something; that something being oil in the case of the bowling environment.

Here's the simple explanation: Depletion of oil on the lane results in earlier reaction (ball could lose energy too soon....lose of down lane reaction).

Carry down of oil on the lane typically results in later ball reaction.

Now for the dissertation:

Depletion of oil

Givens: 1) The ball is traveling at its fastest speed as it leaves the hand (facilitates skid). 2) Axis Rotation is at its greatest at release (facilitates skid). 3) During the balls path down the lane track flare increases exposing fresh cover stock (facilitates depletion of oil).

Axiom #1

Oil depletion occurs at a greater rate in the mid lane versus the head area in my humble opinion.

Reason being: 1) Ball speed and axis rotation are at their greatest during the first part of the lane. 2) Ball speed and axis rotation decrease in the mid lane as flare increases. 3) Track flare is a contributing factor to mid lane oil depletion.

Axiom #2

I had a great reaction then the heads starting hooking. Really?

Maybe not:

Depletion of oil in the mid lane moves shortens the skid zone and moves Hook Zone closer to the foul line. What once was a good reaction we now see the ball over reacting down lane. (slide #2)

The move left (right handers) is not to find more head oil, but to get the ball into the fresh oil in the mid lane restoring our original ball reaction. (slide #3)

Carry down

Oil picked up on the balls surface in the mid lane is re-deposited on the lane after the ball leaves the end of the oil pattern. (slide # 6)

The additional oil past the end of the pattern reduces the traction between the ball and the lane surface. Less traction….less reaction.

Oil depletion and carry down similarities. Excessive oil depletion in the mid lane can cause the ball to progress through the Skid and Hook Stage prematurely. Turning rotational energy into translational energy too soon and the ball often hits flat.

Carry down moves the Hook Zone further down lane, reducing the balls chances of getting into the Roll Stage. Often resulting in the ball hitting flat.

Thus, similar effects on ball motion down lane.

General guidelines:

Move feet and maybe target left ………ball reaction restored………probably dealing with oil depletion.

Move feet and maybe target left ………ball reaction not restored………change to a weaker ball and deliver another ball on the same line. Ball reaction restored……...oil depletion.

Ball reaction not restored………. possibly carry down.

Carry down………move feet and target right of the original target to get around carry down. Sometimes, this move will require balling up to a stronger cover stock.

While this may seem like a lot to digest......once familiar with the process.....it only takes several shots for me to make a decision what the athlete is dealing with....depletion or carry down.


Put Slides after this


File:1 Fresh Shot Good Ball Reaction.jpg