Analysis of Ship-Side Wave Profiles 



With respect to the effectiveness of the simple correction 

 (c), Figure 24 shows its relative merits and demerits in compari- 

 son with (a) and (b). 



(iii) Wave -Making Resistance 



Ordinary towing tests are carried out with M 20 and 

 M 21 by fitting the plate -stud stimulator at 0.05 L behind the stem. 



The wave -making resistance coefficients 



Cw = Rw / y U 2 L 2 (16) 



which are obtained by adopting Schoenherr-line with form factor 



K = 0. 07 (M 20) and K = 0. 15 (M 21), are presented in Figures 25 



and 26. 



In these Figures, the three kinds of calculations are also 

 given for comparison with the experiment, 



(a) Cw calculated by existing theory, or from the hull- 

 generating source m( £ ) , 



(b) Cw calculated from the wave-analyzed source m( £ ) , 



(c) Cw calculated by m — correction ( M = 0. 4). 



Calculation (b) again shows the best and the most satis- 

 factory agreement with experiment in contrast to calculation (a) or 

 (c). 



(iv) Amplitude Function 



Comparison is also made on the amplitude function of the 

 total free waves for the speed of Fn = 0.2887 (K Q L = 12). Figures 

 27 (M 20) and 28 (M 21) show four kinds of amplitude function, 

 i. e. 



(a) Amplitude function calculated by existing theory, 



(b) Amplitude function calculated from wave -analyzed sour- 

 ce distribution, 



695 



