This paper describes a method for obtaining the optimum ship form of low resistance and its validation including the prediction of separation by model experiment. Wigley form is used as the parent model. Based on Michell's wave resistance theory and considering viscous resistance, nonlinear optimization techinique, SUMT method, is applied for two cased, one for bow form optimization and the other for overall optimization. Occurrence of separation is checked by a newly devised, simple prediction method of separation. Model experiments are made to investigate the comparison between the theory and experimental results.
