A method has been developed to provide real-time values of the aerodynamic loads on a helicopter blade during a windtunnel experiment. The aerodynamic loads are derived from the equations of motion for each single blade, which are governed by the variations of the blade angles and the moments of inertia of the various rotating systems. Determination of the blade loads in a continuous mode is a key decision factor in the assessment of the efficiency of a blade profile being submitted to changing wind conditions as it rotates. The rotor loads and moments at blade centre are determined as well, which will help in the process of minimizing the vibration levels transmitted to the helicopter structure. To check the method, the torque, necessary to drive the rotor, is calculated and compared to the actual torque measured and both values match very well. Comparison of the dynamic loading obtained by the analytical method and balance measurements corrected for inertia are very promising too. The analytical method will improve the quality of the database offered to the ONERA windtunnel clients and the test productivity. Due to this analytical method, essential parameters for rotor optimisation such as aerodynamic torque generated by a blade during a rotation and the dynamic loading at blade centre can be calculated. The application of this method, to an existing ONERA database, enables to: -Identify the azimuth zones with low blade torque, taking into account 3 rd harmonic. This partly concurs with calculations performed by the ONERA applied aerodynamic department; -Reveal the important variations in calculated aerodynamic torque when 5 th harmonics are taken into account; -Show the good correlation between the global torque measured by the torque meter and the sum of the torques generated by each blade as calculated by the analytical method; -Calculate the dynamic loading at blade centre; -Bring to light the very encouraging correlation between the dynamic loading obtained by the analytical method on the one band, and that obtained by a method based on balance measurements corrected for inertia loads.