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What must the velocity for the model tests be in terms of the other parameters? Use the subscript m to denote the model parameters and no subscript for the prototype. vm =D The fluid dynamic characteristics of an airplane flying 240 mph at 10,000 ft are to be investigated with the aid of a 1 : 13 scale model. If the model tests are to be performed in a wind tunnel using standard air, what is the required air velocity in the wind tunnel? Is this a realistic velocity