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6,deg Figure aeroelastic airfoil antisymmetric laminate construction balsa spar core baseline 1 blade baseline design bending stiffness bending-twist coupling blade cross section blade designs blade stiffness blade with antisymmetric blade with symmetric chord lengths chordwise divisions Chordwise stiffness ratio Chordwise-bending stiffness ratio Chordwise-bending-twist coupling parameter classical beam stiffnesses Co)sp composite blade composite material composite rotor blades core material coupled stiffness coupling and stiffness cross-section analysis Effect of Cfl)sp extension-twist coupling parameter finite-element Flapwise stiffness ratio Flapwise-bending stiffness ratio flapwise-bending-twist coupling parameter flexural stiffness ratio function of extension-twist function of flapwise-bending-twist function of ply ground resonance incorporating elastic couplings increasing the spar laminate design laminate variations Langley Research Center lb-in Lines of constant neutral axis nondimensional coupling plies contributing pling ply angle ply orientation angle present study rotor blade cross skin and spar stiffness ratios versus symmetric laminate construction Torsional stiffness ratio Trends caused twist rate variations of spar Young's modulus