60 



F = 0.430 



Figure 32 



Sectional-Area Curves for Ships of Least Resistance and 

 Infinite Draft (Pavlenko) 



A similar investigation on wholly submerged bodies of revolution 

 has proved rather fruitful, particularly because of a lack of any earlier work 

 on this subject.^^^ 



Optimum sectional-area curves (optimum doublet distributions) are 

 similar to corresponding curves of surface ships, but peculiar form effects 

 seem to be more pronounced with submerged forms . 



Finally, we must return to our point of departure— ships of least 

 total resistance. Adding a frictional-resistance term to the wave resistance 



R. 



R„ + Rf 



[29: 



where R„ is assumed proportional to the wetted surfaces, and applying Ritz's 



method to R. , a closer approximation can be obtained 



Within the range of 



examples investigated, no great differences were found between the forms cal- 

 culated from conditions of minimum wave and minimum total resistance as given 

 by [29]. However, it is expected that such a procedure may eliminate some 



