Depth of Engine Foundation (\(D_f\)):

\[ D_f = \frac{V_f}{w_e + L_e} \]

Where:

• \(D_f\) is the depth of the foundation, m.
• \(V_f\) is the volume of the foundation, m³.
• \(w_e\) is the width of the engine plus allowance, m.
• \(L_e\) is the length of the engine plus allowance, m.