Yim 



The application of linearized wave resistajice theory to slow 

 full ships following our present state of knowledge overstrains this 

 theory heavily. This theory should not be discarded, however, 

 completely as long as it is used as a heuristic principle only, i.e. 

 as means to look for solutions which must be checked experimen- 

 tally. 



It is recommended to use in this sense several earlier inter- 

 esting papers published by the author. Considering the present 

 critical attitude towards linearized wave resistance theory in general, 

 I wish to state that its use (including perhaps some correcting "im- 

 provements" for practical purpose still can be highly recommended 

 in case of medium or especially high Froude numbers. It should be 

 remembered that in the range of the large wave resistance hump 

 values computed by Michell's theory may differ by an amount only 

 from experimental results which corresponds to the scatter of the 

 latter derived from models in different scale. Therefore I welcome 

 the author's present second approach on the subject of transom sterns 

 although the correlation between form and generating singularities 

 (so far rather indicated than carried out) may still require further 

 studies. 



With regard to the author's statement about lack of systematic 

 experimental evidence it is suggested to look into report No. 167 

 Institut fuer Schiffbau Hcimburg and to check if something useful can 

 be found there. 



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