Speed Ratio (\( R \)):

\[ R = \frac{N_c \times H_s}{C_{gw}} \]

Where:

• \( R \) is the speed ratio.
• \( N_c \) is the number of cells.
• \( H_s \) is the hill spacing, in meters (m).
• \( C_{gw} \) is the circumference of the ground wheel, in meters (m).