1. Airfoil coefficient library specification This data group is optional and is only available for Arbitrary Systems. Only one airfoil coefficient library may be specified. This data group is not permitted for systems which include a wind turbine specification. The airfoil lift, drag, and moment coefficients on elements that are not part of a wind turbine are applied via lookup table (no induction). The airfoil lovrary file is described in Airfoil library file description. 1.1. Data group identifier, one input line AIRFoil COEFficient LIBRary 1.2. File name specification, one input line FILE_NAME FILE_NAME: character(256): Path to the airfoil coefficient library Stress joint Winch