$$ \fracdmd\theta = \dotm in - \dotm out + \sum \dotm_leaks $$

$$ \fracdVd\theta = - \omega \cdot \dotV $$ Where $\omega$ is rotational speed and $\dotV$ is volumetric displacement rate.

Where $\dotV theor = \fracz_1 \cdot n \cdot V max60$ for male rotor speed $n$ (RPM).

Where ( h ) = clearance height, ( w ) = width, ( \mu ) = viscosity, ( L_path ) = leakage path length.