Report KD 501 has been made public. The tittle of this report is: Determination of the Cm-alfa curves for different positions of the axis of rotation for a 10 %, 5 % and 7.14 % cambered airfoil with an aspect ratio of 5. The information out of this report is needed if one wants to design a pitch control safety system for a rotor with 7.14 % cambered blades.