Rotor blades for wind turbines include a structural support member disposed internal the rotor blade that extends for at least a portion of a rotor blade span length, an airfoil structure supported by the structural support member, and a support flange connecting the airfoil structure to the structural support member. The support flange includes a first wall connected to the structural support member, a second wall connected to the airfoil structure, and a connection wall that extends between the first wall and the second wall.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT
 This invention was partially made with government support under government contract No. DE-AR0000293 awarded by the Department of Energy. The government has certain rights to this invention.