Table F - Ribbon Factor 

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Screw Diameter Ribbon Width     15% Trough Loading       30% Trough Loading        45% Trough Loading   
6 1" 1.32 1.52 1.79
9 1-1/2" 1.34 1.54 1.81
10 1-1/2" 1.45 1.67 1.96
12 2" 1.32 1.52 1.79
12 2-1/2" 1.11 1.27 1.50
14 2-1/2" 1.27 1.45 1.71
16 2-1/2" 1.55 1.69 1.90
18 3 1.33 1.53 1.80
20 3 1.6 1.75 1.96
24 3 2.02 2.14 2.28