On Pressure Loss at the After Part of Wing Section

Abstract

In a previous paper (literature 1) a method of calculation of form drag has been described. As the second report concerning the same problem, the present paper deals with an approximate method of estimation of pressure loss due to viscous effect near body tail. It is much probable that the pressure drag due to the change of ideal pressure distribution resulting from the formation of boundary layer can reach a considerable amount for a full body even without separation. This phenomenon is especially of importance in ship resistance problem. The calculating procedure is as follows. Using the modified Buri's method two independent equations are solved simultaneously and the pressure loss is derived. The discussion about separation point and Reynolds effect is not made. Comparison with the experimental results of Fage et al. shows a fairly good coincidence.