def Cz_deltae(self, alpha):
    return (((- MAV.C_D_delta_e) * np.sin(alpha)) - (MAV.C_L_delta_e * np.cos(alpha)))
def Cz_deltae(self, alpha):
    return (((- MAV.C_D_delta_e) * np.sin(alpha)) - (MAV.C_L_delta_e * np.cos(alpha)))