def CD(self, alpha):
    CD_alpha = (MAV.C_D_p + (((MAV.C_L_0 + (MAV.C_L_alpha * alpha)) ** 2) / ((np.pi * MAV.e) * MAV.AR)))
    return CD_alpha
def CD(self, alpha):
    CD_alpha = (MAV.C_D_p + (((MAV.C_L_0 + (MAV.C_L_alpha * alpha)) ** 2) / ((np.pi * MAV.e) * MAV.AR)))
    return CD_alpha