ATTWOOD'S PROPOSITION TO POWER DESIGN OF A PLANING BOAT

摘要

This paper is concerned with the balance of planing boat s thrust and resistance at the top speed. As an example the discussion was done about the trial test data of a PT boat having 35 m in overall length, 9 m in width, 1304.3 kN (133.0 tonf) in displacement and three propellers. Thrust 184.0 kN (18.8 tonf) exceed total resistance slightly at the top speed 41.19 kt. More difference between thrust and resistance is obtained as decreasing in speed These show the validity of Attwood's proposition in his "Textbook of Theoretical Naval Architecture". The proposition says that overestimation of thrust by 10 % is necessary in case of having no design information.