Mori j Inui and Kagitani 



REPLY TO DISCUSSION 



Kazuhiro Mori 



University of Tokyo 

 Tokyo 3 Japan 



Thank you, Professor Eggers, for your kind comments and 

 questions, especially as to the fx -correction. 



The comments of Professor Eggers about the results present- 

 ed in Figure 12, the analysis of source distribution, are quite sound. 

 There results concern a thiner model at a speed of KoL =16, which 

 is rather slow for which the amplitude of the absolute wave height is 

 less than one centimetre. We measured the wave height by photo 

 methods using scales drawn on the ship's surface, with a one-centi- 

 metre mesh. I am afraid the accuracy of the measured wave height is 

 not enough, which explains the result of the analysis distribution in 

 Figure 12. 



Secondly, the wave making resistance coefficient is calculat- 

 ed from the analysied source distributions for each speed. The source 

 strength is therefore not constant with speed. 



DISCUSSION 



Roger Brard 



Bassin d'Essais des Carenes de la Marine 

 Paris j France 



I should like first to congratulate warmly the authors for the 

 valuable contribution to the ship wave theory that they have presented 

 to this Symposium. 



The idea of deriving the wave resistance from the surface 

 elevation along the hull and not from the free waves is probably not 

 quite new, since Guilloton, for instance, has attempted, some years 

 ago, to take into account the surface elevation along the hull in the 



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