Derived scaling laws were used to measure accuracy of the designed scaled-down models that can predict the fundamental frequency of the full-scale I-beam. The ply level scaling approach was applied to a prototype with a unidirectional layup to develop models that are completely similar to their prototype. For a prototype with non-unidirectional layup, the Distorted Layup Scaling approach was developed to design partially similar scaled-down I-beams which have layups different than their prototype. The accuracy of the designed models in replicating the dynamic characteristic of the prototype was investigated by predicting the fundamental frequency of the prototype using derived scaling laws. According to the results, depending on the layup of the prototype and desired size of the model, scaled-down I-beams were designed which could predict the fundamental frequency of their corresponding prototype with a very good accuracy. 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