Fundamental Study on Thrust Deduction

Abstract

The problem of viscous effect on thrust deduction becomes increasingly important in recent years. The authors attempt to make an introductory study on this problem in this report. Two bodies of revolution of fine and full forms are used as the model. Resistance increase due to propeller suction, pressure distribution over the surface and the boundary layer velocity distribution with and without propeller action are measured in a circulating water tunnel. The results are compared with calculation and the frictional part of thrust deduction is shown to be small.