Ratio of Angles

? The “Ratio of Angles” 

 The ratio between the drilling angle and the VAL angle gives insight into how sharp or smooth the ball’s motion will be. 

 Ratio = Drilling Angle : VAL Angle 

 ? Higher Ratio (e.g., 70° : 30°) 

 

 

 More length in the front part of the lane 

 

 

 Sharper backend reaction 

 

 

 Best for high-rev players or when lanes are dry 

 

 

 ? Lower Ratio (e.g., 40° : 70°) 

 

 

 Earlier, smoother roll 

 

 

 More control on heavier oil or sport conditions 

 

 

 Best for speed-dominant or lower-rev players 

 

 

 

 ? Example Layouts 

 

 

 

 

 

 Bowler Type 

 Example Layout 

 Ratio 

 Reaction Shape 

 

 

 

 

 Speed-Dominant 

 40° × 4" × 70° 

 1:1.75 

 Earlier, smoother reaction 

 

 

 Balanced (Tweener) 

 55° × 4½" × 40° 

 1.4:1 

 Benchmark shape 

 

 

 Rev-Dominant 

 70° × 5" × 30° 

 2.3:1 

 Length with sharp backend 

 

 

 

 

 

 

 ? Summary 

 

 

 

 

 

 Term 

 Controls 

 Lower Value 

 Higher Value 

 

 

 

 

 Drilling Angle 

 Skid phase 

 Earlier roll 

 Later roll 

 

 

 VAL Angle 

 Backend motion 

 Sharper 

 Smoother 

 

 

 Ratio of Angles 

 Overall shape 

 Smooth/control 

 Angular/strong 

 

 

 

 

 

 

 ? In Short: 

 

 The ratio of angles defines how fast or slow your ball transitions from skid → hook → roll. 

 

 

 Higher ratio = more angular shape 

 

 

 Lower ratio = smoother, more controlled shape