As shown in Fig. P7.63, a "noisemaker" B is towed behind a minesweeper A to set off enemy acoustic mines such as at \(\mathrm{C}\). The drag force of the noisemaker is to be studied in a water tunnel at a \(\frac{1}{4}\) scale model (model \(1 / 4\) the size of the prototype). The drag force is assumed to be a function of the speed of the ship, the density and viscosity of the fluid, and the diameter of the noisemaker.

(a) If the prototype towing speed is \(3 \mathrm{~m} / \mathrm{s}\), determine the water velocity in the tunnel for the model tests.

(b) If the model tests of part (a) produced a model drag of \(900 \mathrm{~N}\), determine the drag expected on the prototype.

Figure P7.63

Transcribed Image Text:

C B