Sometimes we may do the model test for finding the best fore body or aft body shape such as we can have two or three different bulb shapes attached to the same model, the remaining portion remaining same, test them in a towing tank and decide which should be the best shape available to us. So, model experiments are done for a quantitative
prediction of, I call it like this, quantitative prediction of EHP - I have told you what is EHP, is it not, effective horse power-or qualitative analysis of form for improvement of flow. So, this is the reason why we do model experiments.