A model of submarine is scaled down 1/20 of the prototype and is to be tested in a wind tunnel. The speed of the prototype at which we are to estimate the drag is 8 m/s. Explain why there would be no dynamic similarity if the submarine prototype is moved near the free surface. What will be ratic of the drag between the model and the prototype? Giving that Vsea water 1.21 × 10-2 cm²/s. Vair = 1.64 × 10–1 cm²/s psea water = 1027 kg/m³. Pair =

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Engineering Standards and Codes

Standards are technical publications designed to ensure the reliability of goods, products, methods, or services. They establish technical requirements, specifications, guidelines, features, or design procedures. Standards recommend a set of tolerance for design, processes, operations, production methods, or equipments used in a particular area. Standards are not legally binding unless they are accepted as code or regulation.