1. Department of Airplane Aerodynamics, Technische Universität Braunschweig, 38108 Brunswick, Germany
2. Department of Transport Airplanes, DLR, German Aerospace Center, 38108 Brunswick, Germany
3. Technische Universität Braunschweig, 38108 Brunswick, Germany
4. Department of Aeroelasticity, DLR, German Aerospace Center, 37073 Göttingen, Germany