Study of Eggers’ Method for the Determination of Wavemaking Resistance

Abstract

One of the assumptions of Eggers' method for measuring wavemaking resistance, that the effects of the near-field surface disturbance may be neglected, is investigated analytically for a family of vertical struts extending to various depths. It is found that the error in Eggers' transverse-cut method is less than 1 percent at strut drafts of shiplike dimensions, if surface profiles at downstream distances greater than one model length are used. For vertical struts, errors of about 5 percent would be expected for struts of drafts of about half to three times the model length at downstream distances between one and two model lengths. A graphical procedure for minimizing the errors due to the aforementioned assumption is proposed.