Question

A submarine model (L/Lm 52 will be tested in fresh water under two different conditions: a) b) on the surface, where the prototype moves at 25 kt (knots) submerged, where the prototype moves at 2.9 kt Enforcing dynamic similarity in each case, find the model speed (m/s) and the ratio of drag force on the prototype in seawater compared to that for the model. For case (a), compute the ratio of model to prototype Reynolds numbers and discuss its significance. For case (b), compute the ratio of model to prototype Froude numbers and discuss its significance.

Answer 1