4 cameras on the floor spaced 14 m horizontally and 8 m laterally, 11 m below the hub center. Markers on all blades and at the fuselage allow measurement of the hub position and the blade elastic deformation in flap, lead-lag and torsion all around the rotor revolution every 15 degrees. This allows the synthesis of continuous blade motion in space (radius) and time (azimuth).
