An Investigation into Gerritsma's Formula of the Resistance Increase by Energetics

Abstract

It is shown that Gerritsma's formula of the resistance increase can be derived by energy consideration. The co-ordinate systems and control surface which are used in this investigation are shown in Fig. 1 and Fig. 2, and it is assumed that the disturbed velocity potentials are derived by strip theory. The deduction begins with head sea condition and then reaches oblique sea conditions.