Wind turbines (offshore and onshore) must make the most of the available wind to produce electricity. Adjusting the angle of incidence of the blades optimizes their output by arranging our Telltales on a rotating axis, modifying the angle of their tail in cycles.

This setup allows us to verify that all Telltales have the same behavior (slopes), and the amplitude enables us to calibrate the E-Telltale® in terms of angle. Indeed, on one side, the minima correspond to the vertical position of the E-Telltale, with the tongue down and an angle of 0°. On the other side, the maxima correspond to the horizontal position of the E-Telltale, with an angle of 20°.

To date, only abacuses are used to compare the incidence with the wind speed. The anemometer is often placed at the back of the wind turbine mast, a position where the airflow can be disturbed by the movement of the blades themselves. Another measurement technique involves placing the anemometer at the top of a weather mast and estimating the wind speed at the turbine based on its relative position to the mast. The control of the blade position according to the measured speed is not done in real time, indicating a potential for optimization.