SPIN TIME/SPIN DEPTH 


in seconds = in feet = suggested multiplier (D)


.88 =  10  =  1.0


1.82 = 20  =  1.2 to 1.3


2.64 = 30  =  1.4 to 1.5


3.42 = 40  =  1.6 to 1.7 **We believe the chart to be fairly accurate up to 40 feet due to the larger number of samples.


Not enough samples beyond 40 feet to evaluate 


The main idea is that it takes less than a second for a Roller to achieve 10 feet.