The drag characteristics of a torpedo are to be studied in a water tunnel using a 1:5 scale model (length prototype/length model = 5/1). The tunnel operates with freshwater at

20°C whereas the prototype torpedo is to be used in seawater at15.6°C.To correctly simulate the behavior of the prototype moving with a velocity of 30 m/s,what velocity is required in the water tunnel? Assume Reynolds number similarity.