File:01DualAngleSweetSpot.pdf

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01DualAngleSweetSpot.pdf(file size: 45 KB, MIME type: application/pdf)

The attached file is a reference guide to help in deciding a bowlers "sweet spot" and to assist in the application of the Morich Dual Angle System. Includes a compilation of information from the BowlingChat forums / wiki, Mo's brain (among others!), plus sample bowlers of various types with the recommended sweet spot, ratio, and layouts.

PLEASE NOTE: this reference is only a guide. There are many variables that come into play when deciding on angle sums, ratios, pin to PAP distances, etc, and it is nearly impossible to break down all of those variables into clear cut bullet points. The bowler examples included in the PDF are valuable examples of real and accurate recommended sweet spots and layouts for a given type of bowler. Be sure to make use of these examples by comparing your specs to those in the PDF for further guidance in determining your sweet spot and benchmark layout.

The following is the first page and a half of the guide for quick reference:

Angle Sum Variance:

  • ± 30° for elite bowlers
  • ± 20° for good bowlers
  • ± 10° for average bowlers

Determine the Sum of angles by analyzing bowler's ball speed & rev rate.

  • Speed = Revs use medium angle sums from around 95°
  • Speed Dominant use smaller angle sums between 60° - 90° (very speed dominant to slightly dominant)
  • Rev Dominant use higher angle sums between 100° - 130° (slightly rev dominant to very dominant)

Adjust Sum of Angles for very high or very low tilt & rotation.

Mo will also lower the sum of angles for those with very high tilt & rotation, or raise the sum for those with very low tilt & rotation.

  • Lower totals by about 10° for very high tilt
  • Raise totals by about 10° for very low tilt
  • Lower totals by about 5° for very high rotation
  • Raise totals by about 5° for very low rotation

Determine the angle ratio by analyzing the bowler's axis rotation and tilt.

Drilling Angle, Sum of Angles, & Ratio Adjustments

  • Make adjustments based on bowler specs that are extremes
  • Normal Axis Rotation: 45° - 60°.......Normal Axis Tilt: 13° - 17°

  • Use lower drilling angles for high Axis Rotation
  • (this may reduce the ratio & sum of angles)

  • Use lower ratios for high Axis Rotation in conjunction with low Axis Tilt
  • (helps smooth out breakpoint)

  • Lower drilling sum slightly for high Axis Tilt
  • Lower drilling sum more for high Axis Tilt & high Axis Rotation
  • (helps ball get into transition quicker - similar to speed dominant bowler)

Adjust the angles for the pattern the bowler wants to use the ball on.

  • Use higher ratios for flatter or more demanding patterns to create a stronger reaction to friction
  • Use lower ratios for easier THS wet / dry patterns for more control and mid-lane reaction

Roll the ball, then use balance holes to fine tune reaction


Additional Information

  • For a more aggressive coverstock ball use larger angle sum layouts
  • For a less aggressive coverstock ball use smaller angle sum layouts


If the ball design creates a later, sharp break point, use lower ratio (lower drilling angle to VAL).
If the ball design creates a sooner, forward rolling ball, use more ratio (higher drilling angle to VAL)

High tilt players use Pin to PAP distances of 4 1/2" to 5 3/4" (with Asymmetrical balls)

  • 4 ½” Pin to PAP distance will make the ball come off the spot hard (more angular)
  • 5 ¾” Pin to PAP distance will make the ball roll forward sooner

Asymmetrical Balls exhibit most flare at Pin to PAP distances of 2 3/4" to 6 1/4"
Symmetrical Balls exhibit most flare with Pin to PAP distances of 3 to 4"

Retaining Axis Rotation & Axis Tilt (increase skid, reduce flare):

  • To retain Axis Rotation and Axis Tilt in SYMMETRICAL equipment, we would tend towards longer pin-pap (> 4") distances, while ASYMMETRICAL equipment we use shorter pin-pap distances (< 3"). We would also chose higher angle ratios (2:1 - 3:1) to promote a longer first transition to make the most of what Axis Rotation and Axis Tilt is available at release.

Burning Off Axis Rotation & Axis Tilt (decrease skid, increase flare):

  • To burn off Axis Rotation and Axis Tilt quicker in SYMMETRICAL equipment, we would tend toward Max flare pin positions (3" - 4"), while longer pin distances (4"+) in ASYMMETRICAL equipment. We would also chose lower angle ratios (1:1 - 1:2) to get the ball to reach the first transition sooner, while trying to eliminate jumpy back end reaction that tends to accompany high Axis Rotation and Axis Tilt.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeDimensionsUserComment
current14:31, 8 March 2013 (45 KB)Mattinthehat (Talk | contribs)
06:12, 4 March 2013 (45 KB)Mattinthehat (Talk | contribs)
12:06, 12 October 2010 (46 KB)Mattinthehat (Talk | contribs)Removed old bowler / layout examples, in the process of updating with more accurate examples.
20:05, 17 June 2010 (81 KB)MattInTheHat (Talk | contribs)
11:24, 29 April 2010 (72 KB)MattInTheHat (Talk | contribs)
11:22, 29 April 2010 (72 KB)MattInTheHat (Talk | contribs)
09:51, 18 April 2010 (63 KB)MattInTheHat (Talk | contribs)
12:21, 16 April 2010 (63 KB)MattInTheHat (Talk | contribs)Reference guide to help in deciding a bowlers "sweet spot" and to assist in the application of the Morich Dual Angle System. Includes a compilation of information from the BowlingChat forums / wiki, Mo's brain, plus 10 sample bowlers of various types with
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