A ship 150 m long moves in fresh water at 15°C at 36 km/h. A 1:100 model of this ship is to be tested in a towing basin containing a liquid of specific gravity 0.90. What viscosity must this liquid have for both Reynolds and Froude model laws to be satisfied ? At what speed must the model be towed ? If 117.7 watts is required to tow the model at this speed, what power is required by the ship ? Dynamic viscosity of water at 15°C is 1.13 × 10–3 N.s/m2.
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