Horsepower (\( HPi \)):

\[ HPi = HPh \cdot \sin(\alpha) \]

Where:

• \( HPi \) is the power requirement when the screw is in an inclined position, in horsepower (hp).
• \( HPh \) is the power requirement in the horizontal position, in horsepower (hp).
• \( \alpha \) is the inclination of the screw, in degrees (°).