Data for Ships of Minimum Resistance 



to see the experimental results of a new model which is more exactly corre- 

 sponding to the theoretical model used in the wavemaking resistance computation. 

 Even though it means additional work it is a rather essential step. I would like 

 to know the authors' views on doing this additional experiment. 



DISCUSSION 



Lawrence W. Ward 



Webb Institute of Naval Architecture 



Glen Cove, Long Island, New York 



This is a very interesting paper following the Ann Arbor paper and signifi- 

 cant in including model tests of the forms. I would like to quote a sentence from 

 the paper and then make a comment on it. In the last part of the "Abstract" we 

 read: 



The occurrence of separation behind the stern bulb of the 

 symmetric model may have masked possible superior wave- 

 making qualities as indicated by a rather small surface dis- 

 turbance. 



Thus, the authors clearly recognize that the residual resistance is not a good 

 measurement of wave resistance in that it is not based on the waves in a direct 

 way. I suggest at the least one should take a qualitative look at the wave pattern 

 as is done by Inui, using stereo-camera pairs. Better yet, one should make 

 quantitative measurements by means of a wave survey according to methods 

 such as the ones which have been proposed by Dr. Eggers at Hamburg, Hogben 

 and Gadd at NPL, or myself. Such methods are not as difficult to use as some 

 might think, and while subject to certain approximations they should form a 

 much more accurate means of obtaining the wave resistance in cases such as 

 those in this paper. 



DISCUSSION 



G. P. Weinblum 



InstitutfUr Schiffbau der Universitat 



Hamburg, Germany 



The discusser has tried to popularize the application of polynomials for the 

 determination of hull forms of low wave resistance. There were two reasons for 



1061 



