Arc of Contact (\( \text{Arc} \)):

\[ \text{Arc} = 180^\circ - \frac{57.3 \cdot (D_l - D_s)}{C} \]

Where:

• \(\text{Arc}\) is the arc of contact, degrees.
• \(D_l\) is the diameter of the larger pulley, inches.
• \(D_s\) is the diameter of the smaller pulley, inches.
• \(C\) is the center distance between pulleys, inches.