Pien 



/O^C 



f-y^ 



Fig. 3 - Experimental wave resistance of 

 the 5 ft in. Series, 60 Model (0.60 Block) 



Finally, I should like to say in reference to the suggested improvement in 

 agreement of theory and experiment as either value becomes small, Wigley him- 

 self as most of us know tested two models of the parabolic form of 3/4 and 1/2 

 the beam of the original, which was already quite a thin ship, with no such im- 

 provement in agreement between the experimental values obtained and the 

 Michell's calculation which, of course, remained constant (on a coefficient basis). 

 I do not mean to imply that Dr. Pien's results are not correct but that they 

 should not be looked at as being general. 



DISCUSSION 



A. Silverleaf 



'National Physical Laboratory 



Teddington, England 



Dr. Pien's work in applying wavemaking resistance theory to ship design is 

 held in the highest regard at N.P.L., and this latest progress report contains 



1144 



