finding the degree sweet spot

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MattCosta7
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finding the degree sweet spot

Post by MattCosta7 »

Is there a mathematical formula to discover the layout sweet spot in degrees given a certain style?

For instance
given a bowler
17mph
325-350rpm
16 degrees tilt
30-45 degrees rotation

is there a formula to discover the "sweet spot" for the dual angle layout? Or is this still mostly a trial and error situation. I saw this being discussed in another post and was curious to see if there was a mathematical approach to this, or whether it's still a comparison.
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Re: finding the degree sweet spot

Post by Mo Pinel »

MattCosta7 wrote:Is there a mathematical formula to discover the layout sweet spot in degrees given a certain style?

For instance
given a bowler
17mph at the scorer (19.5 mph initial ball speed)
325-350rpm
16 degrees tilt
50-60 degrees rotation

is there a formula to discover the "sweet spot" for the dual angle layout? Or is this still mostly a trial and error situation. I saw this being discussed in another post and was curious to see if there was a mathematical approach to this, or whether it's still a comparison.
It IS mathematically based on the style of the bowler. A 30* sum (minimum) is for "Rocket Man/Percy Pussknuckler". A 160* sum (maximum) is for Tommy Turtle/Rubber Wrister. The median is the sum of those 2 numbers / 2 or 190 /2 = 95*. This guy is Tony Tweener. The "sweet spot" needs to be adjusted for axis rotation and axis tilt. Make sure your ball speed estimate is the initial ball speed. Initial ball speed is approximately the scorer's ball speed + 2.5 mph.

For your example, the player is slightly speed dominant with a little excess tilt. ( By the way, 16* of tilt is almost always associated with more than 45* of axis rotation.) Spped dominent with more rotation and tilt leads me to a 65-70* "sweet spot".
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Re: finding the degree sweet spot

Post by SGIT »

I apologize in advance if this is an ignorant question, but how does one determine axis tilt and axis rotation?
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kellytehuna
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Re: finding the degree sweet spot

Post by kellytehuna »

From reading the posts on this forum, you would find the axis tilt by tracing out the first track ring, them measure the distance across its diameter. There is a chart somewhere in this forum listing the level of tilt associated with each distance.

Axis rotation can be FAIRLY well estimated by having someone observe the ball off your hand. Somebody else might have a better, more accurate method of measuring the axis rotation, but you should be able to get a pretty good guess just looking at the ball as it rolls down the lane.
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Re: finding the degree sweet spot

Post by MegaMav »

SGIT, I hope this helps.

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Re: finding the degree sweet spot

Post by Mo Pinel »

kellytehuna wrote:From reading the posts on this forum, you would find the axis tilt by tracing out the first track ring, them measure the distance across its diameter. There is a chart somewhere in this forum listing the level of tilt associated with each distance.

Axis rotation can be FAIRLY well estimated by having someone observe the ball off your hand. Somebody else might have a better, more accurate method of measuring the axis rotation, but you should be able to get a pretty good guess just looking at the ball as it rolls down the lane.
Good post. To do axis rotation accurately, you must use a video camera. It's pretty elaborate. The procedure is in the "See It, Do It, Feel It" manual, available at www.morichbowling.com.
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Re: finding the degree sweet spot

Post by fufu »

Could someone tell what is considered "normal" axis tilt?
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Re: finding the degree sweet spot

Post by Mo Pinel »

fufu wrote:Could someone tell what is considered "normal" axis tilt?
It's in the axis tilt chart posted in here. 13* - 15* is considered median. The automatic ball thrower, "Harry", used by the USBC in the Ball Motion study, was set at 13* of tilt, 55* of axis rotation, 275 rpms and 17.5 mph at release.
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kellytehuna
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Re: finding the degree sweet spot

Post by kellytehuna »

Mo Pinel wrote: Good post. To do axis rotation accurately, you must use a video camera. It's pretty elaborate. The procedure is in the "See It, Do It, Feel It" manual, available at http://www.morichbowling.com.
Thanks Mo. I would like to think I'm starting to make sense of all this information. Every day something new sinks in a little more. :)
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