The objective of the sub-project COSDYNA (COntrol Surface DYNAmics), conducted in collaboration with the Département Aéroélasticité et Dynamique des Structures (DADS) as part of the DLR HighPerFlex project, was to create a high-value experimental database for motion-induced, unsteady, aerodynamic rudder forces until now unrepresented in the literature and intended to validate the TAU (DLR) and elsA (ONERA) RANS solvers.
This involved constructing a wind tunnel model of an unswept rectangular wing, supported by rotatable mountings on both sides, with a supercritical aerofoil of 9.2 percent thickness and, additionally, a hinged trailing edge flap. The flap covered 25 percent of the chord and extended across the entire wingspan, and, in addition to global torsional vibration of the entire wing, permitted the introduction of torsional vibration up to 100 hertz by means of hydraulic actuators fitted at the sides.