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Author Topic: Revving vs. rolling  (Read 3548 times)

da Shiv

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Revving vs. rolling
« on: August 24, 2003, 06:01:08 PM »
I'd like to get something straightened out regarding definitions.  There seems to be some confusion regarding the terms "rev up" and "roll."  It seems to me that a lot of people use these terms interchangeably, and I don't believe that is correct.  This causes communication confusion in a lot of posts.  There is less confusion on the subject of roll, which most people seem to understand, but what does it mean to for a ball to "rev up?"

Here's how I've always understood it.  I've always thought that when it is said that a ball revs up fast, that means that it gets going around it's axis quickly.  Low RG balls, which are more center heavy, tend to do this by their very nature.  When it is said that a ball revs up slowly, that means that it starts spinning around it's axis more slowly--sometimes referred to as "loping" down the lane.  High RG balls, which are more cover heavy tend to do this by their very nature.  To clarify; both balls referred to above are still skidding down the lane for some distance, but the ball that revs up faster is going around it's axis faster and rather subjectively "looks" better; while the ball that revs up slower is going around it's axis slower and "looks" a bit lazy.  This so-called "revving up" (it seems to me) is largely RG-dependent, but is also affected by the friction of the coverstock.  A ball that is shinier should "rev up" faster than an equivalent ball that is dull, because the shiny ball experiences less friction and can spin on it's axis easier than a dull ball that experiences a somewhat higher level of friction (even in the oil) which would cause it to spin on it's axis less readily.  This is how I've always understood the term "revving up."  Is this correct?  If it is, we should get that made clear, and if it isn't we should get everyone (including me) straightened out about what it really does mean.  

I think we're all in agreement on the meaning of the term "roll."  That's when the ball has finished it's skid and it's hook (which is the last part of the skid cycle) and has "grabbed" the lane and  has a translational (down the lane) motion in the same direction as it's rotational motion around it's axis.  

In many posts, it seems to me that the terms "revving up" and "rolling" are used interchangeably and I dont believe that is correct.  When a ball revs up has an effect on when it rolls, but the terms are not equivalent.

I hope there is some discussion of this, because if I've misunderstood the term "revving up" I'd like to get it straight for myself and everyone else so we are all on the same wavelength with respect to our terminology in our discussions.

Shiv
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Listening to the monotonous staccato of rain on my desk top
Listening to the monotonous staccato of rain on my desk top

 

charlest

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Re: Revving vs. rolling
« Reply #1 on: August 25, 2003, 10:12:34 AM »
Shiv,

Wow! Have you opened up a can of worms!!!
I can see by the terms you use, you also have read too many of the "professional" ball reviews and are using the terms they use, without having the definitions on hand, mentally. This confuses everyone and leaves interpretation WIDE open for mistakes.

There are so many Physics factors involved in this discussion, that I know about, but cann't decribes their details. The point, I believe, of "revving up" ball, whether it be by the bowler putting "revs" on the ball at his release point or the low RG of a ball helping a bowler with less "revs" to get the ball into a roll sooner IS to get the ball into a roll soon enough to counter the amount of oil on the lane, so that when the ball gets to the pocket, it is in the roll cycle of the "skid, hook, roll" cycle.

Some of those factors are
- the bowler's amount of revs at release,
- the bowler's axis tilt,
- the bowler's axis of rotation,
- the bowler's ball speed,
- the RG of the ball,
- the surface of the ball, icluding both the polish level and type of surface,
- the flare of the drilled ball,
- the oil pattern,
- the oil amount,
- the arc of the ball throught the oil pattern, and the bowler's chosen breakpoint.

I am sure there are others.

I believe that when we picture a ball "revving up" what we see in our mind's eye is the revolutions of the ball beginning to slow as it enters the hook cycle. This is because we see, even if we do not label it as such, the ball beginning to slow down in both revolutions and in its path towards the pocket. This slow-down is the indication that it is starting to grab the lane.

When this process seems earlier in one ball than a second ball, we saw the first ball "revs up" sooner than the second. BUT there are so many factors involved, we cannot truly AND accurately say one factor (the RG value) has more to do with the "revving up" than any other factor.

So, I believ, the only evidence of our eyes of a ball's revving up, unless your eyes can count the change in revolutions and ball speed, is how soon it goes into the hook and then the roll cycle, on a particular lane, when thrown by a particular bowler.

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da Shiv

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Re: Revving vs. rolling
« Reply #2 on: August 26, 2003, 08:08:07 PM »
Zzzzzzzzzzzzz.......

Shiv
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Listening to the monotonous staccato of rain on my desk top
Listening to the monotonous staccato of rain on my desk top

da Shiv

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Re: Revving vs. rolling
« Reply #3 on: August 26, 2003, 08:46:04 PM »
I just realized that my last post in this thread might be taken to indicate boredom with charlest's reply.  That was not what I meant, and I apologize.  I'm just trying to get a little more discussion going.  I have a little more commentary on this subject, but I'm not going to take the time to get into it if there's no interest.

Shiv the Post Killer
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Listening to the monotonous staccato of rain on my desk top
Listening to the monotonous staccato of rain on my desk top

da Shiv

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Re: Revving vs. rolling
« Reply #4 on: August 27, 2003, 02:15:38 PM »
Thanks for the comments, guys.  I'm really just trying to find out if I have the right idea of what is being said when I hear someone say that a ball "revs up" either quickly or slowly.  I should acknowledge that, of course, how quickly any ball revs up is dependent upon who is throwing it, so how fast any ball revs up varies by the bowler.  I think, however, that if a given ball is said to be slow revving, then it will be slow revving for everyone--even though what constitutes "slow revving" will vary from bowler to bowler.  A bowler who imparts lots of revs with his release might get that ball to rev up faster than a rev-challenged bowler will be able to rev up a high revving ball--but relatively speaking, the high rev bowler will still see that ball as slow-revving--for him.

I tend to like balls that are--by my definition anyway--fast revving.  I therefore like low RG balls and I never use high RG drillings--except once.  I got a Triton Elite in a pro-am once and it was kind of a freaky ball.  It was about 5.5 inches pin-out.  I decided to experiment with it and had a high RG drilling put into it.  The pin was way up over the fingers and near the track.  That ball (not even a high RG ball) was what I would call slow revving.  It looked like it was laboring to even go around it's own axis as it went down the lane--what I believe I have heard referred to as "loping."  When it finally encountered dry it turned--hard.  It was almost impossible for me to control.  The faster revving balls have a more controllable motion--for me.

This story is told using the terms "revving up" and "loping" as I understand them.  All I'm really trying to do is find out if I'm using these terms in the same way that most others use them.  It frequently seems to me that in the bowling world we have lots of people using the same terms but having different definitions for them and confusion results.

Just so no one finds it necessary to point out, I know that the term revs is also used in another way--the way that tells how many actual revolutions a bowler gets on the ball.  I believe that I have heard that the average bowler gets 12-15 revolutions (revs) on the ball with his typical shot.  High rev players may get more than 20.  Then of course there is also revolutions per minute (RPM), with typical bowlers getting around 250-300 RPM and high rev players maybe 350-450?  What's Robert Smith get--600?  I'm not sure of any of these numerical ranges, but I do at least know what they mean.

Shiv
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Listening to the monotonous staccato of rain on my desk top
Listening to the monotonous staccato of rain on my desk top