Affiliation: | aNASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA;bDepartment of Mechanical and Aerospace Engineering, University of California, Mail Stop 0411, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0411, USA;cFreiligrathstrasse 6, 63071 Offenbach, Germany;dThe Boeing Company, Rotorcraft Division, Structures, Technology, and Prototyping, Industrial Hwy and Stewert Ave., Ridley Park, PA 19078, USA |