User:Megamav/Sandbox

Ratio Discussion

Mo told me this is how he figures benchmarks and I quote:

1) Choose the pin to PAP distance to determine the resulting flare. 2) Determine the sum of the angles to determine the distance of the 2nd transition. Ball speed to rev rate ratio is the primary determining factor here. 3) Determine the ratio of the angles to determine the shape of the ball motion. Axis rotation and axis tilt affect this decision a lot. 4) Use balance hole to dial in the final reaction. 5) Use surface to finish the job. Mo says "Ratio of angles are mainly a function of axis tilt and axis rotation with tilt being somewhat more important than rotation. The bigger the ratio (3:1), the later and sharper the break point and the better it works for low tilt players (<12* of axis tilt). Conversely the smaller the ratio (1:2), the earlier and more forward rolling the break point and the better it works from high tilt players (>19* of axis tilt). Once you decide on the ratio, the rest is math".

After you have calculated the total sums and before you can calculate the benchmark or sweet sums, it is necessary to find the benchmark ratio to accurately calculate the drilling angle and the val angle individually.
It is necessary to calculate this for each bowler according to individual specs. Here are some examples of ratios frequently used by Mo for speed/revs matched + normal rotation.

Tilt	Initial Ratio	Ratio Range		3	2:1	Range
7.	2:1	Range
10	2.5:1	3:1 to 2:1
12.5	2:1	Range
15	1.5:1	2:1 to 1:1
17.5	1.25:1	Range
20	1:1	1.5:1 to 1:1.5
25	1:1.5	Range
30	1:2	1:1 to1:3

Calculation Notes

10* tilt= 2.5:1 initial ratio with 3:1 to 2:1 initial range of ratios.
15* tilt=1.5:1 initial ratio with 2:1 to 1:1 initial range of ratios.
20* tilt=1:1 initial ratio with 1.5:1 to 1:1.5 initial range of ratios.
12 1/2* tilt= 2:1 initial ratio (example to self)
17 1/2* tilt= 1.25:1 initial ratio (example to self)
If speed/revs is not matched or rotation is extremely high or low it is necessary to increase or decrease ratios in order to calculate the benchmark ratio. Use the initial ratio as a base for calculations.
Higher speed dominance and/or extreme high rotation=decrease ratios.
Higher rev dominance and/or extreme low rotation= increase ratios.
example # 1: 20* tilt with very speed dominant and/or high rotation, the initial ratio would have been 1:1. The new adjusted benchmark ratio will be 1:1.5 with a new ratio range 1:1 to 1:2 (range is an example only).
You could go wider to include more layout options for a wider range of conditions, higher or lower depending on amount of dominance.
example # 2: 20* tilt with very rev dominant and/or low rotation, the initial ratio would have been 1:1. The new adjusted benchmark ratio will be 1.5:1 with a new ratio range of 2:1 to 1:1(range is an example only).
You could go wider to include more layout options for a wider range of conditions, higher or lower depending on amount of dominance.

Further Notes

These ratios need to be calculated according to amount of speed dominance or rev dominance and/or excessive high rotation or excessive low rotation. you need a correct ratio to utilize in conjunction with your total sums to accurately calculate your sweet sums. Your adjusted ratio range would be used with the +or- total sums to calculate long pattern and short pattern layouts. Mo frequently uses the lower ratio range for control drillings for easy conditions or wet/dry. He frequently uses the higher ratio range for more challenging conditions. The amount you increase or decrease ratios would depend on each individual bowlers specs and the ability of the ball driller to accurately interpret them.

Please note: at 7*of tilt and lower, the ratios seem to get smaller. At 10* of tilt average ratios are 2.5:1. BUT at 7* high revs is closer to 2:1 at 7* tilt high rotation or speed is closer to 1.7:1