A towboat for river barges is tested in a towing tank. The towboat model is built at a scale ratio of 1: 13.5 Dimensions of the model are overall length 3.5 m, beam 1 m and draft 0.2 m. (The model displacement in fresh water is 5500 N.) Estimate the average length of wetted surface on the hull. Calculate the skin friction drag force of the prototype at a speed of 7 knots relative to the water. | Numerade
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