This is the article written by the author during his study tour in the Japanese Aquatic Engineering Institute, where the calculation formulae shown in the article were programmed by means of computer with the personel recommendation and assistance of Mr. M. Tsuchiya, director of the institute and Dr. of marine engineering. The estimation of actual hp. was then conducted based on the Japanese tuna liner at the same time, a ship model was made and had tank resistance test. Finally the estimation abtained satisfactory results while compared with the test results.
