Question: A prototype ship is 400 ft long and has a wetted area of 30,000 ft2. A one-eightieth scale model is tested in a tow tank

A prototype ship is 400 ft long and has a wetted area of 30,000 ft2. A one-eightieth scale model is tested in a tow tank according to Froude scaling at speeds of 1.3, 2.0, and 2.7 kn (1 kn = 1.689 ft/s). The measured friction drag of the model at these speeds is 0.11, 0.24, and 0.41 lbf, respectively. What are the three prototype speeds? What is the estimated prototype friction drag at these speeds if we correct for Reynolds-number discrepancy by extrapolation?

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For water at 20C take 194 slugft3 209E5 slugfts Convert the velocities to ftsec Calculate the Reyno... View full answer

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