Movi- s Inui and Kaji-tani- 



A slight phase shift, however, is observed with the first 

 wave crest of the wide model M 21, which appears to be attributable 

 to the non-linear flow effects in close vicinity of the stem. 



To find out the accuracy of approximation, similar calcu- 

 lation is also carried out with M 21 by adopting m - correction 

 ( M = 0. 4), whose result is also presented in Figures 7~9. 



(ii) Wave Patterns 



The measured wave contours of the tested two Inuid models 

 M 20 and M 21 are obtained at a single speed Fn = 0. 2 887 (K Q L = 

 12) by cross fairing of the longitudinal cut wave recordings of every 

 5 cm intervals from y = 0. 25 (close to the model's side) through 

 y = 1.7 5 (tank side wall). 



The final results are reproduced in Figures 19 ( M 20 ) 

 and 20 ( M 21 ) respectively. 



The corresponding calculations are carried out in three 

 different ways. 



(a) by existing theory, or from the hull-generating source 

 m(|) , 



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



(c) by M - correction ( M =0.4) 



These calculated wave patterns are presented in Figures 

 21-24. 



The existing theory (a) (Figure 21) shows the poorest 

 agreement with experiment. Particularly, the transverse waves are 

 tremendously exaggerated in this calculation in accordance to the 

 author's previous suggestions [_1J • 



The clear disagreement between existing theory (a) and 

 experiment is again improved successfully by the present approach 

 (b). 



In fact, not only the general features but also the details of 

 the measured wave patterns of the tested models M 20 (Figure 19) 

 and M 21 (Figure 20) are beautifully reproduced in Figure 22 

 (M 20) and Figure 23 (M 21), respectively. 



694 



